Forecast Discussions mentioning any of "HRRR" "RAP" "RUC13" "RUC" "RR" received at GSD on 09/09/22

Area Forecast Discussion
National Weather Service Charleston SC
1016 PM EDT Thu Sep 8 2022 .SYNOPSIS... A cold front will remain south of the area into Friday, before likely shifting back into the area over the weekend. Another cold front could impact the region during the early to middle of next week. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... A low level easterly flow off the ocean and a mid and upper south to southwest flow out of the Gulf of Mexico will support a continued feed of abnormally moist air, where PWat will reach at least 2.0 to 2.25 inches across the area. The 18Z run of the GFS depict dilatation axes setting up across much of the forecast counties. Combined with strong forcing from the front to the south and blocking high pressure to the north, the end result will be for increasing convective rains through the night. Radar estimates showed as much of 4-6 inches on Thursday across parts of coastal Liberty and coastal McIntosh. While it is possible that similar localized amounts can occur further north through the overnight, 1 to 2 inch amounts will be more common from coastal Bryan and parts of Chatham County north to parts of Charleston County. It is definitely concerning that recent runs of the HRRR show some 1-2 inch amounts per hour. With the antecedent wet grounds it won`t take much to produce at least minor flooding. Expect at least the issuance of Flood Advisories. While some heavy rains can move into the Charleston metro overnight, the better chances still look to stay to the south and over the ocean. Previous discussion... A mid and upper level trough will pull off the east coast, as a deep low aloft spins near the mouth of the Mississippi River through the night. At the surface a stationary front just to the south of the region will fluctuate north or even transform into a warm front as it tries to lift into the southern counties overnight. The forcing from the front and embedded short waves aloft will combine with deep tropical-like moisture, with PWats some 120-140% or normal, plus strong low level convergence and better isentropic ascent, will lead to increasing coverage of showers and t-storms through the night. Diurnal activity has diminished a bit from earlier, and is already starting to show signs of increasing coverage again near the coast due to low level moisture convergence. Leaning to a consensus of the 18Z HREF, recent runs of the HRRR and the NBM, we show coverage to peak in at least the 50-70% range, greatest near the coast. The best forcing initially occurs over southeast Georgia prior to midnight, then spreads into parts of South Carolina after midnight. We added mention of heavy rains over some east and southeast counties due to the HREF probabilities of at least 20-40% chances of more than 3 inches in each 3 hour window from the late evening through the overnight. At this time the heaviest rains do look to stay south of Charleston through 6 AM, but Beaufort and Savannah seem to have a much greater chance of receiving heavy rains. On average rainfall amounts will be 1-2 inches, but as usual, locally higher amounts up to 3 or 4 inches can occur, especially over the coastal counties south of Charleston. Temps will get down close to evening dew points, which are mainly in the 70-75F range. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/... Aloft, a closed low centered across the northern Gulf of Mexico and Deep South will slowly shift north this weekend, eventually phasing with a longwave trough tracking across the Central United States to the Northeast by early next week. At the sfc, high pressure centered across the Mid-Atlantic and Northeast states will gradually give way to the approaching low/longwave trough, helping sfc low pressure associated with the cutoff low to advance north and a front to drift back into southern areas and/or along the coast this weekend well ahead of a cold front advancing closer to the region early next week. The overall pattern favors deep moisture to be drawn from the Gulf of Mexico and Atlantic, setting up an unsettled pattern across the Southeast through the weekend. Friday appears the be of most concern in regards to the potential of heavy rains and a marginal risk of severe weather across the local area, but much will depend on the position of a front across/near southern areas and/or near the coast in regards to stronger storms. The mid-upper-lvl low positioned to the west is expected to draw moisture across the front in an environment already displaying PWATs in excess of 2.0 inches. Although showers/thunderstorms should move along, the combination of shortwave energy rippling across the region, moisture convergence, and favorable isentropic lift across the local area suggests widespread showers along with a few embedded thunderstorms capable of producing heavy rains/flooding, especially since the front remains somewhat anchored across the area for an extended time. Rainfall amounts in the 2-4 inch range are expected, locally higher amounts are possible, especially across southern areas near the coast. Flood Advisories should eventually be needed. Further south, the risk for stronger thunderstorms is a bit higher, but will be highly dependent on the northward progression of the front. Modest low-lvl winds and instability wrapping around the eastern edge of the northern tracking sfc low combined with ample forcing associated with the front and mid-lvl shortwave energy rippling across the region, suggest a few strong and/or marginally severe thunderstorms near the front across southeast Georgia capable of damaging winds in the form of wet downbursts given deep moisture and poor low-mid lvl lapse rates. There also appears to be a small window of time for a weaker tornado across southeast Georgia given a backing wind component along the sfc low and 25-30 kt 0-6km bulk shear present during highest instability (mainly mid-late afternoon hours), but widespread rain/showers and cloud cover should limit a tornado threat considerably and likely keep the risk south of the local area or perhaps offshore. Saturday and Sunday: The main concern for the remainder of the weekend will continue to be a locally heavy rainfall threat and potential for flooding, given a continuation of h5 shortwave energy rippling across the Southeast United States and the vicinity of a front. The issue could be exacerbated along the coast if rainfall coincides with high tide (see tide section below). WPC currently highlights most of the area in a Marginal to Slight Risk Saturday, which could eventually be extended into Sunday. The severe weather threat will remain low. Rainfall totals Saturday through Sunday should average in the 1-3 inch range, highest near the immediate coast, but isolated higher amounts are possible. High temperatures during the weekend will average below normal with clouds and rain around. It will be coolest on Friday when highs top out around the upper 70s to lower 80s, but should slowly warm to the mid 80s Saturday and Sunday. Lows will mainly be in the low to mid 70s. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... Ridging off the Southeast coast will weaken early next week as an expansive mid level trough and phasing closed low shifts towards the East Coast. Meanwhile, a cold front will slowly progress into the region Monday night into Tuesday, possibly stalling in the vicinity mid week. Showers and thunderstorms will be possible each day, but it doesn`t look as active/wet as the upcoming weekend. It should return to a more typical diurnal pattern. Temperatures will largely be within a few degrees of normal. && .AVIATION /02Z FRIDAY THROUGH TUESDAY/... KCHS and KJZI: Both terminals look to stay VFR the first part of tonight, with increasing chances for flight restrictions to occur late tonight and especially on Friday. This will occur as a stationary front to the south begins to lift back north as a warm front and considerable moisture and lift develop over the area. This will cause numerous to occasional widespread SHRA/+SHRA with scattered TSRA. We show MVFR conditions starting around 11Z and continuing through the rest of the 00Z TAF cycle. But IFR is certainly possible at times. KSAV: While we begin the night with VFR conditions, it looks to deteriorate down to MVFR by around 04Z and will stay at least down in the MVFR range the rest of the forecast period, if not even lower. This occurs as stationary front nearby lifts north as a warm front. That along with considerable moisture and lift, it will generate numerous to widespread SHRA/+SHRA and scattered TSRA, especially overnight and Friday. Extended Aviation Outlook: Periodic flight restrictions in showers and thunderstorms are likely through the weekend and into early next week. && .MARINE... Tonight: The pressure gradient between a stationary front to the nearby south and high pressure in the Northeast will cause the gradient to become somewhat pinched over the marine area. We certainly can`t rule out some Small Craft Advisories. But for now we increased NE and E winds to 15-20 kt with some higher gusts, and will continue to monitor. Seas will be a mix of wind driven shorter periods and swell driven longer periods, averaging 3-5 feet, with some 6 footers perhaps sneaking into the outermost Georgia waters near 50-60 nm offshore and maybe near 20 nm off Charleston County. Mariners should remain alert for increasing coverage of t-storms through the night. Some of which will be strong and will likely require the issuance of Marine Weather Statements and/or Special Marine Warnings. Friday through Tuesday: Onshore flow will prevail through the weekend, then gradually veer south early next week as high pressure to the north shifts offshore in advance of a cold front arriving late Monday into Tuesday. The pressure gradient between the high and low pressure tracking inland will favor a slightly enhanced gradient across local waters and wind speeds topping out near 15-20 kt, staying just shy of Small Craft Advisory criteria early this weekend. Winds will then weaken, averaging 15 kt or less late weekend into early next week. Seas will be 3-5 ft initially, then subside to 2-4 ft. There will be potential for stronger winds and reduced visibilities within showers and thunderstorms which should be plentiful through at least the weekend. Rip Currents: Long period swell around 11-12 seconds being generated from distant Hurricane Earl combined with onshore winds will lead to an elevated risk of rip currents at all of our beaches through the weekend. The current forecast features a High Risk for all beaches Friday, and a continuation of at least a Moderate Risk along all beaches Saturday. && .TIDES/COASTAL FLOODING... The combination of the upcoming full moon and onshore winds will lead to elevated tide cycles through the weekend. Coastal Flood Advisories will likely be needed, especially with the evening high tides into the weekend. The risk will be highest along the Charleston and Colleton County coasts, where minor to moderate coastal flooding will be possible. Further south, tide levels could approach minor flood levels. In addition, conditions will be exacerbated if rainfall coincides with the time of high tide. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. MARINE...None. && $$ NEAR TERM... SHORT TERM...DPB LONG TERM...DPB AVIATION...DPB MARINE... TIDES/COASTAL FLOODING...
Area Forecast Discussion
National Weather Service North Platte NE
633 PM CDT Thu Sep 8 2022 ...Aviation Update... .SHORT TERM...(This evening through Friday night) Issued at 317 PM CDT Thu Sep 8 2022 Temperatures and precipitation will continue to be the main concern along with the remaining potential for critical fire weather concerns through the rest of today into the early evening. See fire weather discussion below for more details. Temperatures the remainder of the afternoon will continue to rise for areas across the southern Sandhills, central and southwest Nebraska as the Katabatic cold front pushes through there will be compressional heating which will result in a brief sharp temperature rise where highs could exceed over 100 degrees, which has already been seen across the northern Sandhills this afternoon. Valentine went from 100 to 106 degrees within a half hour as the front passed through, then temperatures begin to fall shortly after the passage. As for precipitation chances this evening into the overnight, did decrease chances, this evening, as there is a lot of dry air that should inhibit much precip. However, if a thunderstorm does develop, there is a potential for dry lightning as any thunderstorm that does develop will likely be LP in nature. Most models have some chances of precip overnight, although the HRRR has been trending much drier, did keep slight chances in the forecast through the overnight. Precip chances will mainly be across the Sandhills into north central Nebraska, confidence is low in precipitation across southwest Nebraska so kept PoPs out of the forecast during the overnight. For Friday, precipitation chances increase in the evening hours as an increase in low level moisture will move into the region ahead of an upper level trof. Highs on Friday will be 30 to 40 degrees cooler than today with temperatures only in the mid 60s to low 70s. .LONG TERM...(Saturday through Thursday) Issued at 317 PM CDT Thu Sep 8 2022 Precipitation chances continue on Saturday as the upper level trof continues to push through the Nebraska. Main mode of precipitation will generally be rain showers, as instability will be lacking, so there is low confidence in any thunderstorm activity. Highs on Saturday will only be in the 60s. Temperatures Saturday night will be considerably cooler with lows dipping into the upper 30s across the western Sandhills. The upper level ridge begins to build in the beginning of next week, thus the cooler temperatures will be short lived and warmer temperatures return. && .AVIATION...(For the 00Z TAFS through 00Z Friday evening) Issued at 633 PM CDT Thu Sep 8 2022 For the 00z TAF cycle. A cold front currently bisects western Nebraska from southwest to northeast. The front has passed through KVTN and more recently, KTIF. Timing on the front through KLBF is around 00z this evening. An abrupt wind shift to the north will occur with the frontal passage, additionally, CB and the occasional cloud to cloud lightning strike will be possible, but coverage does not warrant a mention in the official TAF for KLBF. It should be noted that there is a substantial dry layer below any CB, if a TS were to form, expect very gusty erratic wind, but on limited visby disruptions. Otherwise MVFR ceiling invade western Nebraska by 15z tomorrow with the threat of showers. Lower ceilings at KLBF should occur just beyond the forecast cycle. && .FIRE WEATHER... Issued at 317 PM CDT Thu Sep 8 2022 A strong cold front will push through the area later this afternoon into the evening hours. Winds will shift abruptly to the north with passage of the front and gusts up to 30 KTS will be possible. The front is expected to pass through the KVTN terminal this afternoon and early this evening at the KLBF terminal. Skies will be scattered at 25000 FT AGL through daybreak Friday. Ceilings will lower to 3000 to 6000 FT AGL Friday morning. && .LBF WATCHES/WARNINGS/ADVISORIES... Red Flag Warning until 8 PM CDT this evening for NEZ204-206- 208>210-219. && $$ SHORT TERM...Gomez LONG TERM...Gomez AVIATION...Jacobs FIRE WEATHER...Gomez
Area Forecast Discussion
National Weather Service New Orleans LA
643 PM CDT Thu Sep 8 2022 ...New AVIATION... .SHORT TERM... (This evening through Saturday) Issued at 337 PM CDT Thu Sep 8 2022 Starting out in the upper levels, a broad ridge centered near the 4- Corners region extends from California to beyond the Great Lakes. A trough sagging southeast over the Appalachian Mountains stretches southwest to the north-central Gulf of Mexico. The base of this trough is virtually right over the CWA. As the next few days progress, the base of the trough will be clipped off and become a cutoff low. In fact, recent satellite shows the mid-level circulation already starting up. One of the main things that the presence of the upper low will do maintain higher rain chances. Looking closely at the water vapor imagery, there`s pockets of drier air mixed in and rotating the low. Recent upper air soundings show modest moisture available in the column and ample CAPE. It suggests a reflectivity output that the latest HRRR shows for this afternoon is fairly likely. Afternoon convective initiation has already begun with fairly decent coverage already north of I-10/12 corridors. Intensities aren`t particularly strong as of 20Z but still seeing an uptick periodically. Main concern will be gusty winds and small hail. Per latest sounding, instability is quite high with MUCAPE over 2500J/KG and LI`s up to - 7. Shear is virtually non-existent. Friday and Saturday will be quite similar as the overall pattern shows little change. The upper low will be completely closed off at this point and meandering around south Louisiana. It should be deeper at this point, which will both likely support higher rain chances but also keep temps down below normal (the 2nd effect of its local presence). There`s a low chance for some localized flash flooding as training will be possible but the threat doesn`t appear to be particularly high at this point. && .LONG TERM... (Sunday through Wednesday night) Issued at 337 PM CDT Thu Sep 8 2022 Moving into the latter half of the weekend, an upper level trough will be dropping out of the High Plains down into the mid Mississippi Valley. At the same time, the upper low that`s been sitting over the local area will be weakening while being absorbed by this approaching upper trough. A cold front associated with the trough will be moving south across TX, LA, and MS. Some showers and storms are expected to develop ahead of this boundary and impact the local area. Coverage looks to be less than previous days as PW`s aren`t quite as high. Additionally, instability doesn`t look overly impressive but sufficient for thunderstorms. The first few days of next week will start off with scattered to numerous showers and storms as the boundary reaches the CWA. Models suggest the upper trough will close off a low near the Great Lakes and it will slowly progress eastward. That puts the CWA right on the southern extent of the trough`s influence...pretty close to zonal flow. Thus, the boundary will probably stall somewhere within the CWA. This will create a gradient of low POP`s to the north higher POPs to the south as well as cooler temps to the north and warm to the south. Expect to see larger swings in POPs and Temp forecast for that timeframe as models attempt to resolve the movement of a weak boundary. && .AVIATION... (00Z TAFS) Issued at 643 PM CDT Thu Sep 8 2022 Expect all of the terminals to be VFR throughout the night. The convection that occurred during the day today has mostly died out with the exception of a cluster of storms in southern Terrebonne Parish. MCB did not have any fog or low ceilings this morning, so because of that along with low guidance confidence, VFR conditions are forecasted to prevail there. Later in the period, high resolution model guidance suggests more widespread convection than today, so VCTS was introduced at all terminals around 18-19z. The same guidance suggests that the convection will move from east to west and be widespread over the whole area with the exception of the far western portions. So, all terminals have TEMPO groups for thunderstorms in the afternoon timeframe except BTR. (Zeringue) && .MARINE... Issued at 337 PM CDT Thu Sep 8 2022 Increasing daily thunderstorms will continue to be the main impact for tidal lakes and nearshore waters over the next few days. Broad scale winds and seas will remain in light with 5 to 10 knots and seas of 2 feet or less due to such a weak surface pressure field in place. The main concern from any thunderstorms will be brief periods of gusty winds up to around gale, frequent lightning, and the potential for a few waterspouts. && .PRELIMINARY POINT TEMPS/POPS... MCB 66 84 67 84 / 20 80 30 70 BTR 69 88 70 88 / 40 70 20 70 ASD 70 88 70 89 / 60 80 40 60 MSY 74 86 74 87 / 60 80 40 60 GPT 71 86 71 88 / 50 80 50 50 PQL 70 85 71 88 / 50 80 60 50 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. && $$ SHORT TERM...ME LONG TERM....ME AVIATION...JZ
Area Forecast Discussion
National Weather Service Miami FL
815 PM EDT Thu Sep 8 2022 .UPDATE... Issued at 738 PM EDT Thu Sep 8 2022 Radar data shows a large cluster of showers with embedded thunderstorms moving eastward across Collier and Hendry counties, while lingering rain can be observed across much of the Atlantic metro areas. The cluster over west SoFlo is connected to a larger line that stretches from the SE GOMEX through Central Florida, and seems to have enough energy to at least bring showers across our central areas and along interstate 75 for the next hour or so. And with potential for more showers following up, POPs/Wx grids have been updated to keep scattered to numerous coverage over much of west SoFlo through 04Z. Convection should decrease after midnight, with southerly synoptic flow becoming light. Overnight lows will be similar to the past few days with values in the low-mid 70s inland, and upper 70s to around 80 near the coast. && .SHORT TERM... (Rest of today through Friday) Issued at 310 PM EDT Thu Sep 8 2022 South Florida remains nestled between an upper level low centered just offshore of the Florida panhandle, and upper level ridging extending poleward from the Bahamas poleward the western Atlantic waters. This upper low will slowly drift eastward and approach the west coast of Florida. This will allow for a slight augmentation of shear and moisture profiles across the region, which will favor the development of discrete and semi-organized thunderstorms this afternoon. VAD wind sampling and HRRR forecast soundings have hinted at a mild low-level veering of winds, which should allow for increased moisture transport. Overall, today`s environment will be favorable for scattered to numerous showers and thunderstorms across the region. PW may reach or exceed values of 2.2 inches this afternoon, which coincides with the overall storm coverage and marginal excessive rainfall outlook via the Weather Prediction Center. Cloud-layer mean winds out of the west/southwest around 5-10 kt should allow for storms to gradually drift towards the ENE with time; however localized flooding and ponding of roadways will be the main threat to monitor for today. Other associated impacts include strong (likely sub-sever) wind gusts, and frequent lightning strikes. By tomorrow, an H250 jet streak will progress through the mean synoptic flow, and allow for the aforementioned upper trough/low to become negatively tilted. This will present a setup that features a modest shear enhancement in the 0-3km range, which may allow for a few semi-discrete thunderstorms to end the week. Additionally, deep southwesterly flow remains intact, which will continue to maintain deep moisture across South Florida (PW around 2.0 to 2.2 inches). Overall, this environment may allow for an isolated low-end severe thunderstorm to materialize across portions of the southern peninsula; however localized flooding and ponding of roadways remains the main hazard to monitor for tomorrow. Hot and humid conditions remain in place across South Florida. Afternoon maxes will generally reach the lower 90s, while some locations may approach record maximum temperatures in the mid 90s. Interior locations may experience heat indices in excess of 105 degrees today and tomorrow afternoon. && .LONG TERM... (Friday night through next Wednesday) Issued at 310 PM EDT Thu Sep 8 2022 This Weekend: Over the weekend, the cut off low will begin to break down with pressure from the large trough in central continental US. Unsettled weather will continue with south- southwesterly flow on Saturday bringing plentiful moisture to South Florida. On Sunday, as the cut off low begins to break down with the amplification of the upper level trough, a shift to southerly flow will ensure no end to showers and thunderstorms. The primary concern with the weekend`s activity will be localized flooding due to the slow-motion, high PWATs of these storms. Caution needs to be used when on roads, especially if in urban areas, during the activity. Monday - Wednesday: Moving into next week and typical South Florida wet season, there is no indication of any end to instability and moisture allowing for continued unsettled weather. With the sea breezes and afternoon convection, there will be daily potential for lightning, brief gusty winds, heavy downpours, and localized flooding. The mid-level flow and surface winds will begin to shift bringing a change to the convection pattern, but no break from precipitation. High temperatures will continue to remain near normal. However, with the humidity, we will not be getting a break from the triple digit heat indices anytime soon. Lows will be in the 70s with near 80 along the Atlantic Coast. && .AVIATION... (00Z TAFS) Issued at 743 PM EDT Thu Sep 8 2022 Brief bouts of sub-VFR conditions could still be possible at the start of the TAF period as lingering convection gradually diminishes. Overnight, a return to light/variable winds and generally VFR conditions. Tomorrow, continued SW flow and moisture transport could lead to scattered to numerous SHRA/TSRA for all terminals, with MVFR/IFR conditions and short-fuse TEMPOs all possible. Winds along East Coast terminals will see a shift to more SSE flow as sea breeze develops in the late morning/early afternoon hours. && .MARINE... Issued at 310 PM EDT Thu Sep 8 2022 A wet and unsettled pattern will develop to round off the week, as an upper disturbance increases storm activity across the local waters. This should allow for scattered to numerous shower and thunderstorm activity, with the greatest overall coverage being realized over the Gulf waters. Aside from convective related impacts, seas should remain relatively flat (no greater than 2 ft); however by this weekend, a northeasterly swell may be observed owing to downstream effects of Hurricane Earl. This may result in higher waves for portions of the Atlantic waters. && .BEACHES... Issued at 310 PM EDT Thu Sep 8 2022 Increasing Atlantic swell will result in an elevated risk of rip currents for the Palm Beaches for today, while a high risk for rip current will likely develop for coastal Palm Beach tomorrow and through the weekend. && .PRELIMINARY POINT TEMPS/POPS... Miami 79 92 81 92 / 50 60 20 50 West Kendall 76 92 77 93 / 40 60 20 50 Opa-Locka 78 92 79 93 / 50 60 20 60 Homestead 77 91 78 91 / 40 50 30 50 Fort Lauderdale 80 92 81 92 / 50 60 20 60 N Ft Lauderdale 80 91 81 92 / 60 70 20 60 Pembroke Pines 78 92 79 92 / 50 60 20 60 West Palm Beach 77 93 78 92 / 50 70 20 60 Boca Raton 78 94 80 93 / 60 70 20 60 Naples 78 89 78 91 / 70 80 50 70 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && $$ UPDATE...17 AVIATION...ATV
Area Forecast Discussion
National Weather Service Medford OR
855 PM PDT Thu Sep 8 2022 .DISCUSSION...No further updates are needed this evening. With offshore flow picking up in earnest today in SW Oregon as the thermal trough set up along the coast, NE winds channeling down the Chetco River Valley led to a high of 96F at Brookings this afternoon. It is still 88F there as of 8 pm! With NE winds continuing there overnight into Friday, temperatures won`t cool as much as they usually do at night and this will likely allow it to get hot again on Friday. It could also get quite warm Friday north of Cape Blanco and nearly all the way to the beaches -- that will depend on how strong the east winds are. It could get to the upper 80s around Coos Bay. Oh, and it is ridiculously dry out there. Humidity along the south coast this afternoon was off the charts dry, less than 10%. Of course, it`s already been dry over inland areas, but this should give you a good idea of what`s coming for inland areas tomorrow and Saturday -- more hot and dry! There is enough of a temperature gradient between sea and land to form a full-fledged thermal low pressure system, which will move northward along the coast Friday and eventually out over the ocean. This will send the thermal trough inland and lead to a wind reversal along the coast. More marine influence will end the heat wave at the coast Saturday. But it will get nasty hot again inland with more records likely falling. This is a bit dependent upon how much wildfire smoke is out there from existing fires. But, we have a high of 103F forecast for here in Medford Friday (record is 103F set in 1944) and 105F for Saturday (record is 104F set in 1922). These are some very old records potentially falling folks! For obvious reasons, everyone should remain vigilant about the extreme fire danger over the region. The conditions the next 2 days are extremely conducive to rapid fire spread, so be extra careful not to cause new ignitions. Prevent wildfires. One less spark, one less wildfire! We do expect a change toward cooler weather by next week, so that`s good, but rain chances are still a bit up in the air. Please see previous discussion below for more details on the Red Flag Warnings, Heat Advisories and Air Quality Alerts that are in effect. -Spilde && .AVIATION...09/00Z TAFs...Conditions will remain VFR through Friday afternoon, except for reduced visibility in the vicinity of wildfires. The highest probability of reduced visibility will be in northern Klamath County and far eastern Douglas County with smoke arriving from the Cedar Creek Fire in eastern Lane County. New fires southeast of Klamath Falls and in the Warners of Modoc County are also producing smoke that is affecting visibility. -Sven/DW && .MARINE...Updated 800 PM PDT Thursday 08 September, 2022...A strong thermal trough will persist along the coast into Friday. The strong north winds and steep to very steep seas are beginning to weaken, but will persist into Friday night. Winds shift to southerly Friday night as the coastal low moves far offshore. This will result in a southerly surge of low clouds and fog, initially near shore, that will spread across the waters. Southerly winds near to above advisory strength and a short period northwest swell will produce steep seas Saturday. Conditions then improve early next week as the low weakens. -DW && .PREV DISCUSSION... /Issued 429 PM PDT Thu Sep 8 2022/ UPDATE...Temperatures have risen to 96F at Brookings this afternoon with strong northeast winds funneling down the Chetco River Valley, a bona fide Brookings effect. With the expectation that these winds will continue overnight through at least early afternoon Friday, we have expanded the heat advisory to include the Curry Coast. Temperatures probably won`t cool off that much tonight, at least to what would typically occur, except at the immediate beaches. We are expecting lows in the 60s to near 70F. And, temperatures will once again have the opportunity to rise into the mid to upper 90s on Friday before some marine air brings temperatures back closer to normal Friday night into Saturday. -Spilde PREV DISCUSSION... /Issued 252 PM PDT Thu Sep 8 2022/ SYNOPSIS...A plethora of critical fire conditions are expected Friday into Saturday with a thermal trough bringing another round of hot, very dry, windy, and unstable conditions to the area. Hot temperatures will generate moderate heat risk for locations west of the Cascades Friday and Saturday. Early next week, a couple of low pressure troughs will move through Pacific Northwest and could produce periods of showers and storms depending on monsoonal moisture transport and the transport of moisture from Hurricane Kay. Key Points: * FIRE WEATHER: Hot, dry, windy, and unstable conditions will result in several periods of critical fire weather concerns this afternoon through Saturday. This includes most of our area`s new fires. Avoid using any equipment that can cause sparks and be sure to follow all fire restrictions. * HEAT: Increased risk of heat related illnesses for most of the West Side this weekend. Stay hydrated with water, take frequent breaks in air conditioning, and check in on neighbors and friends without AC. Additionally, some medications may make you more prone to heat illnesses, talk to your doctor/pharmacist for more information. * SMOKE/WILDFIRES: Smoke from area wildfires will continue to impact air quality for many areas. Of note, smoke and air quality levels will fluctuate and depend on just how much smoke is output from these fires, the wind directions/speeds and also ventilation. DISCUSSION... A thermal trough has been keeping the temperatures in Brookings on the warm side for the last 24 hours. They`ve seen temperatures around the mid 80`s as of 5 am this morning and highs pushing into the mid 90`s as of this afternoon. The Chetco effect is also creating critical fire weather conditions along the southern Oregon coast and that is discussed in the fire weather discussion below. Otherwise, smoke from the Cedar Creek fire is heading south and will continue to impact the Klamath Basin this evening with moderate to unhealthy air quality. The HRRR smoke model does show a southerly smoke trajectory in the latest model runs. With east flow developing later tonight, many areas west of the Cascades will begin to see smoke concentrations increase. An Air Quality Advisory has been issued by the Oregon Department of Environmental Quality due to higher smoke concentrations spreading out across the region. The Cedar Creek Fire will likely remain the biggest contributor given it`s current size on satellite. Other recent fires may contribute more smoke to the region as fire weather conditions deteriorate into Saturday. Temperatures will challenge record highs in Medford, Mount Shasta City and Klamath Falls Friday and Saturday. It`s not set if we will indeed break temperature records, but we will at least come close. Thermal troughs moving back inland have a habit of being a bit warmer than the models anticipate. By late Saturday, an upper level low and surface low out over the Pacific will begin to change the overall wind flow over the area. A more southerly component to the winds will emerge at most levels of the atmosphere. By Sunday, temperatures will indeed trend lower for almost all locations except for some areas within Lake County. Coastal stratus will likely cover large sections of the coast as the thermal trough retreats farther inland Sunday into Monday. Thunderstorms are the main none smoke concern heading into next week as tropical moisture and energy from hurricane Kay makes it`s way all the way into northern California and Oregon. Right now, the probability of thunder remains low as ensembles are not quite convinced of rain showers or thunderstorms east of the Cascades next week. -Smith AVIATION...08/18Z TAFs...Conditions will remain VFR through the next 24 hours, except for reduced visibility in the vicinity of wildfires. The highest probability of reduced visibility will be in Klamath County and into northeast Siskiyou and northwest Modoc counties, with smoke arriving on a northerly flow from the Cedar Creek Fire in eastern Lane County. New fires southeast of Klamath Falls and in the Warners of Modoc county are also producing smoke that is affecting visibility. -Sven MARINE...Updated 200 PM PDT Thursday 08 September, 2022...A strong thermal trough will persist along the coast into Friday. Strong north winds and steep to very steep seas will reach peak strength this afternoon and evening. Conditions begin to improve Friday as the thermal trough briefly moves inland. The thermal trough will weaken and a closed surface low will move offshore Friday night into Saturday with a southerly surge of low clouds and fog initially near shore that will spread across the waters. Meantime, areas of steep seas will likely linger into Saturday. Conditions continue to improve early next week as the offshore low weakens and moves northeastward. -Sven FIRE WEATHER...Updated 200 PM PDT Thursday 08 September 2022... Gusty winds and low relative humidities, and gusty winds with moderate to poor overnight recoveries, especially over the mid slopes and ridges will be the main concern into Friday evening for the coastal mountains, northwest fire zone 280, and all of fire zone 618, and Saturday evening for the Cascades, Siskiyous and foothills. An upper trough will swing northeast of our area into western Montana tonight, this has resulted in gusty east to northeast winds blowing near and at the ridges along with extreme dry conditions. These winds are occurring on a lesser scale right now. For example right at the coast, Brookings is now 93 degrees with a relative humidity of 7 percent! Red Mound is 86 degrees, with relative humidity of 8 percent and northwest wind at 14 mph with gust to 35 mph! The latest info on the fuel status for fire zone 618 is that fuels are extremely dry and receptive. Breezy north to northeast winds and dry humidities are likely for portions of the West Side today, especially funneling into the Illinois Valley and portions of Western Siskiyou County. This will bring forth critical fire weather conditions for these areas into this evening. Tonight, moderate to poor overnight recoveries are expected with gusty east to north east winds and Friday will be similar to this afternoon with gusty winds and low relative humidity. In addition high Haines of 6 is expected for the Rum Creek Fire Friday. Because of the above mentioned reasoning, the Red Flag Warning was adjusted and will be in effect until Friday evening. As this trough exits the area tonight, expect winds to become easterly once again tonight into Saturday evening across the Southern Oregon Cascades as well as the foothills, Umpqua Divide, Siskiyous. Along the upper slopes and ridge tops in these locations expect poor recoveries and breezy winds. Valleys and more sheltered areas may see more moderate to locally poor recoveries. It is worth noting that area wildfires west of the Cascades will not benefit from the Marine Push the next couple of days. The other problematic portion of the forecast comes in with the hot, dry, windy, and unstable conditions in the forecast beginning Friday and Saturday. These conditions will be present across all of our existing and new fires giving rise to the potential for rapid spread through plume domination. Conditions on Saturday could be similar to Friday, and an additional red flag warning will likely be needed for Saturday for the Rum Creek Fire. For other fires, like the Twelve Mile Creek Fire in Douglas County, NAM and GFS soundings are indicating a Haines of 5 for these days, but it would not take much to jump it into a Haines 6. Will headline the haines 5-6 conditions in the Fire Weather Planning Forecast, noting that Haines 6 may be present in the forecast, without a Red Flag Warning. Beginning on Sunday monsoonal moisture and moisture from a weakening tropical system will start to feed into the area. Confidence is low in the details of the forecast, as the ensembles have lessened the moisture feed into our area from the tropical system, keeping thunderstorm chances mainly for the East Side aligned with monsoonal moisture. We will continue to update this as the forecast confidence increases. -Petrucelli && .MFR WATCHES/WARNINGS/ADVISORIES... OR...Red Flag Warning until 9 PM PDT Friday for ORZ618>620. Heat Advisory from 11 AM Friday to 11 PM PDT Saturday for ORZ024- 026. Heat Advisory until 8 PM PDT Friday for ORZ022. Red Flag Warning from midnight tonight to 10 AM PDT Saturday for ORZ616-617-621>623. Heat Advisory from 11 AM Friday to 11 PM PDT Saturday for ORZ023. CA...Red Flag Warning until 9 PM PDT Friday for CAZ280. Heat Advisory from 11 AM Friday to 11 PM PDT Saturday for CAZ080>082. Pacific Coastal Waters... Small Craft Advisory from 2 AM Friday to 2 AM PDT Saturday for PZZ350-356-370. Hazardous Seas Warning until 2 AM PDT Saturday for PZZ350-356- 370-376. Gale Warning until 2 AM PDT Friday for PZZ356-376. && $$ MAS/MAS/MAS
Area Forecast Discussion
National Weather Service Pocatello ID
159 PM MDT Thu Sep 8 2022 .SHORT TERM...Tonight through Friday night. Strong cold front has moved into Wyoming with gusty winds expected to continue through about sunset before dissipating rapidly overnight. Have widespread wind gusts over 30 mph through about 9 pm occasionally reaching 40 mph. Outside of the winds main short term impact is the much cooler temperatures today behind the cold front with about 10 to 15 degrees of cooling from yesterday and another 5 to 10 degree cooler high temperatures day on Friday. Many highs on Friday will stay in the 60s high elevations and 70s low elevations. As flow turns more northwesterly expect areas of smoke and haze overnight into Friday. GK .LONG TERM...Saturday through Thursday. Upper ridge builds back into the region behind departing trough. Temperatures start to rebound above normal, but remaining well below recent hot stretch. Focus turns to moisture from Hurricane Kay remnants sliding north through the Great Basin. There is good ensemble and cluster agreement in pushing the ridge axis east by Tuesday. Showers and thunderstorms look to return to East Idaho as early as Monday afternoon. Precipitation chances remain low until later Tuesday as next Pacific trough shifts inland, and the NBM really starts ramping up precipitation chances beginning Tuesday afternoon. It is still to early to hang a hat on any potential precipitation amounts, but precipitable water values from deterministic GFS look to be 0.75->1.0" which certainly holds hope. Best chances for beneficial rainfall appears to be Tuesday night through Thursday. DMH && .AVIATION...Winds and pockets of thunderstorm activity remain the concerns for today. Line of thunderstorms working east through the northeast corner of the region this afternoon; will continue with VCTS at DIJ, though line may skirt just to the north. Gusty winds continue through the Snake Plain, with the highest values over the Arco Desert. Terminals should max out with gusts around 30kts. Blowing dust may be a localized concern. Dry cold front sags south through East Idaho this evening, turning winds to the north and decreasing speeds 00z-04z. Unfortunately, this has the added complexity of smoke inundation to the surface overnight per HRRR Near-Surface Smoke fields. Held off on significant visibility restrictions for terminals, but MVFR reductions with localized or brief IFR visibility are certainly possible. The smoke is likely to continue into Friday. DMH && .FIRE WEATHER... The cold front which moved through the district it into Wyoming and strong winds have developed behind it. A Red Flag Warning remains in effect until 9 pm for winds gusts exceeding 30 mph with the northerly direction in zones 475 and 476 of concern for the Moose fire. Humidity should also drop rapidly after 3 pm as it has remained over 15 percent for most of day as of 1 pm. Winds will die down rapidly overnight and expect minimal wind impact on Friday. Generally a north to northwesterly directions most zones in the 5 to 15 mph range. May see some gusts approaching 20 to 25 mph in the afternoon but will not be widespread. Upper ridge rebuilds over Idaho over the weekend with well above normal temperatures returning. There is the potential for much wetter conditions with rain next week. GK && .AIR QUALITY...Wildfire smoke remains the underlying concern for air quality across the region. Gusty winds continue today, but winds diminish overnight with high pressure returning to the region beginning Friday. Return to overnight inversions should continue to trap existing and new smoke at the surface through at least Saturday. DMH && .PIH WATCHES/WARNINGS/ADVISORIES... Red Flag Warning until 9 PM MDT this evening for IDZ410-411-413- 422-425-427-475-476. Wind Advisory until 9 PM MDT this evening for IDZ052-053. Lake Wind Advisory until 9 PM MDT this evening for IDZ054. && $$
Area Forecast Discussion...UPDATED
National Weather Service Portland OR
903 PM PDT Thu Sep 8 2022 Updated aviation and marine discussion .SYNOPSIS...A strong east wind event is on tap for the Friday into early Saturday timeframe. This will bring critical fire weather conditions, above normal temperatures, and smoke and haze in various quantities for different parts of the area. A southerly flow reversal late Sunday into Monday will lead to a strong onshore push which will replenish moisture for lower elevations to start the work week. && .SHORT TERM...Through Saturday... Key Points: (1) Strong east winds are expected for the Cascades, Cascade Foothills, and Coast Range - especially along exposed ridges and in terrain gaps (most notably the Columbia River Gorge). (2) Widespread haze is likely from fires east of the Cascades. (3) Smoke is expected in the south Willamette Valley (mainly Lane Co.) from the Cedar Creek Fire burning near Waldo Lake. Smoke is possible elsewhere in the Willamette Valley. (4) Much above normal temperatures will be present where there isn`t smoke on Saturday. It`s a challenging forecast on this Thursday afternoon, with low confidence in the outcome of several related forecast variables. First off, a highly anomalous wind event is expected beginning as early as mid-morning Friday morning as cold air settles east of the Cascades to drive a 16mb to 19mb North Bend to Spokane surface pressure difference. The Extreme Forecast Index (EFI) continues to highlight large areas of values greater than 0.95 along the Cascades, with embedded values greater than 0.99 indicating the event is nearly outside of the 20-year model climate for wind speed. Forecast soundings from the NAM continue to suggest sustained wind speeds of around 50 kt in the roughly 2-5kft layer, while the GFS and RAP remain weaker. The gradient alone, however, would suggest the NAM is closer to reality, and hence gust potential, should efficient mixing of these winds to the surface manifest, will be at least within the 50-55mph range. Forecast soundings continue to suggest that it will be difficult to mix these winds to the surface most everywhere, which is good news. Unfortunately, however, exposed ridges in the Cascades and Coast Range will be within the layer of strongest winds, and the channeling effect of the Columbia River Gorge will force more intense near-surface winds there than elsewhere. Thus, these locations will be favored for intense winds which will likely peak only a little bit shy of their max intensity during the Labor Day 2020 east wind event. Friday afternoon through early Saturday morning is looking to be the period of strongest winds for those areas of greatest concern. Given the strong east winds, there are concerns for smoke advection from both the Cedar Creek Fire (mainly for the south Willamette Valley) and other fires in eastern Oregon and eastern Washington. The HRRR smoke output continues to suggest that copious quantities of smoke will impact Lane County through Saturday, while further north across the remainder of the area skies will be hazy with perhaps some settling of low level smoke that gets trapped beneath the inversion overnight Friday night and Saturday night. The best pathway for low level smoke to enter the northern Willamette Valley and adjacent south Washington will be the Columbia River Gorge, through which strong winds could advect quite a bit of smoke from eastern Oregon - though it must be stressed that confidence in this scenario is low at this time. One thing for which confidence is high: wherever thick smoke accumulates in the lower atmosphere, temperatures will be significantly less hot on Saturday than expected, as smoke particulates inhibit incoming shortwave radiation`s ability to reach the surface. Speaking of temperatures, uncertainty in the quantity and location of smoke continues to lead to uncertainty in the temperature forecast for particular locations. NBM continues to suggest a 50% probability that temperatures will reach the triple digits in Eugene on Saturday, but if dense smoke impacts the area then one of the lower probability model outcomes will likely materialize and temperatures might not escape the 80s. Farther north where smoke is less likely to have a substantial impact on temperatures, NBM probabilistic information is likely more useful. In Salem, the model blend gives a 25th percentile temperature forecast of 97 - meaning that there is a 3 out of 4 (or 75%) chance that temperatures will be 97 or hotter. From a thermodynamic perspective, it`s a complex conceptual forecast, as cooler air east of the Cascades is what`s driving the downsloping, but air that descends mountains is warmed dry adiabatically by do temperatures wind up warmer or cooler than expected? For now, we`ll continue to hedge with the NBM, all the while warning folks for the possibility that smoke significantly drives down high temperatures near and downwind (i.e., west and southwest) of the Cedar Creek Fire. -Bumgardner .LONG TERM...Saturday night through Wednesday...The thermal low breaks off Saturday morning, and subsequently moves northward just offshore through Sunday morning, driving a southerly flow reversal which should bring an onshore push - first in the south Valley and later for the rest of the interior - overnight Saturday night. This should replenish moisture levels somewhat for low elevation locations for the start of next work week. Sunday night into Monday, there will even be a chance for drizzle along the coast as the marine layer deepens with the approach of an upper trough which the bulk of the ensemble thinks will pass just to our northwest. Further out in the extended period, cluster analysis suggests little uncertainty in the overall upper pattern with a slow approaching trough from the west and the ridge gradually becoming less amplified and shifting eastward through the work week. Both the EPS and GEFS have many members that suggest precipitation at PDX by late week, indicating needed precipitation - beyond just a few AM sprinkles - could finally arrive for much of the area. In addition, the ensemble is cooler next week overall; NBM suggests the 10th to 90th percentile maximum temperature range at PDX spans 73 to 82 for both Tuesday and Wednesday, which would put us close to our average high of 78 degrees. -Bumgardner && .FIRE...Expect a quick transition to offshore flow to commence this evening as high pressure builds overhead and another disturbance dives out of western Canada into the upper trough over ID/MT. East- northeast winds will begin to increase by late evening over the OR Casacdes, contributing to poor overnight recoveries as RH values only climb into the 30s overnight. Still thinking inversions will keep winds out of the inland valleys until Friday morning, but winds will then quickly expand westward to the coast during the day on Friday as the surface pressure gradient tightens in response to strengthening low pressure along the coast and high pressure in the Columbia River Basin. Red Flag warnings thus remain on track with respect to timing and forecast details. Expect winds to peak Friday night into early Saturday with some gusts to 50 mph over exposed terrain in the Cascades, with 40-45 mph gusts in the Columbia River Gorge favored terrain in the Coast Range. Expecting gusts around 35 mph in the Willamette Valley, but can`t rule out a few gusts approaching 40 mph. This will coincide with minimum RH values in the teens across most of the area, with poor overnight recoveries, especially in the higher terrain. Winds should diminish relatively quickly on Saturday night as another trough approaches offshore and the gradient weakens. This will yield improving although still relatively dry conditions for Sunday, with onshore flow pointing to more seasonable temperatures and less dry conditions going into next week. Finally, there is still a hint that the remnants of a tropical storm will approach the area early next week, with a resulting slight chance of thunderstorms sometime early next week. Confidence in this scenario remains low at this time. /CB && .AVIATION...06Z TAFs: The broad area of low pressure over Canada coupled with building high pressure offshore will maintain dry flow aloft across the Pacific NW through the TAF period. East winds will ramp up Friday and peak during the overnight hours Friday into Saturday. A backdoor front, or one that approaches from the northeast, will swing towards the Pacific NW Friday evening. Building high pressure behind the front will pack that cooler air into the low levels and accelerate wind speeds across most of the CWA. Wind gusts at many Willamette Valley terminals will see wind gusts up to 35 kt. The Coast Range will block the east winds slightly but coastal terminals may see elevated east winds gusting to 20-25 kt. The greatest impacts will be across the Cascade crest where wind gusts up to 50 kt are likely as well as along the western slopes into the foothills where downsloping winds could reach similar magnitude. This forecast is making the assumption that no significant fires are in the area to cause reduced visibility at terminals. However, spreading of current fires east of the Cascades and fire starts overnight will reduce visibility from increased smoke. For detailed Pac NW aviation weather information, go online to: KPDX AND APPROACHES...VFR conditions will persist throughout the forecast period. Expect north winds to shift to easterly by 18Z Friday. Gusts up to 40 kt possible. -BMuhlestein && .MARINE...High pressure remains over the waters through Friday along with a thermally induced low pressure along the southern Oregon coast. This will maintain northerly winds across the coastal waters through Friday afternoon. Winds will begin to shift offshore Friday evening and an exceptionally strong gradient for this time of year will setup overnight Friday into Saturday. The thermal low over the OR/CA border then drifts offshore early Saturday. This will setup another round of offshore winds across the waters as it`s pulled west, winds will shift southerly by Sunday that will become more southerly on Sunday and are expected to persist through the middle of the upcoming week. A northwesterly swell coupled with a northwest windsea will produce steep and choppy conditions across the waters through Friday afternoon. Seas around 8 to 11 feet with a dominant period of 7 to 9 seconds are expected through tonight. East winds through the Coast Range gaps will make for chaotic seas. Seas then gradually subside over the weekend to around 4 to 6 feet. Stronger tidal currents are occurring ahead of the full moon on Saturday. Strong ebb currents during the overnight hours will make for hazardous conditions. Those moving in and out of harbors and crossing coastal bars should use caution and be aware of any bar restrictions in place. -BMuhlestein For information about upcoming marine zone changes, go online to: && .PQR WATCHES/WARNINGS/ADVISORIES... OR...Red Flag Warning from 11 AM Friday to 8 PM PDT Saturday for Central Oregon Coast-North Oregon Coast. Red Flag Warning from 11 AM Friday to 11 PM PDT Saturday for East Slopes of the Central Oregon Coast Range-North Oregon Coast Range-Willamette Valley. Red Flag Warning until 11 PM PDT Saturday for Central Oregon Cascade Foothills-Mt. Hood National Forest West of Cascade Crest-North Oregon Cascade Foothills-Willamette National Forest. WA...Red Flag Warning from 11 AM Friday to 8 PM PDT Saturday for South Washington Coast and West Willapa Hills. Red Flag Warning from 11 AM Friday to 11 PM PDT Saturday for Clark County Lowlands-East Willapa Hills-Eastern Gifford Pinchot National Forest Mt Adams Ranger District-Extreme South Washington Cascades and Foothills. PZ...Small Craft Advisory from 2 AM to 6 AM PDT Friday for Columbia River Bar. Small Craft Advisory until 11 PM PDT Friday for coastal waters from Cape Shoalwater WA to Florence OR out 10 nm. Small Craft Advisory until 2 PM PDT Saturday for Waters from Cape Shoalwater WA to Cascade Head OR from 10 to 60 nm. Small Craft Advisory until 9 AM PDT Saturday for Waters from Cascade Head to Florence OR from 10 to 60 nm. && && $$ Interact with us via social media:
Area Forecast Discussion
National Weather Service Reno NV
156 PM PDT Thu Sep 8 2022 .SYNOPSIS... Temperatures will continue to gradually drop into the weekend, but will still remain above average. Isolated to scattered showers and thunderstorms will impact the eastern Sierra this evening and on Friday. Much cooler temperatures along with precipitation will then enter the area by Sunday through at least next Tuesday. && .SHORT TERM...This Afternoon through Friday... It looks like we`re continuing our streak of very hot, near-record temperatures for the western NV valleys and Lake Tahoe area. If we havn`t set enough records already this September, we`ll come very close to either tying or setting a new daily record high again today in Reno. Temperatures throughout the region will cool a bit on Friday, making records less attainable. However, high temperatures will remain up to 10 degrees above average for mid-September. For this evening and as well as on Friday, the CAMs show enough surface instability to allow for some showers and thunderstorms to form over Alpine, Mono, and Mineral counties. Much like the last few days, DCAPES suggest the biggest threat from these storms will be strong outflow winds gusts up to 50 mph. The risk of flooding remains low due to limited/elevated moisture. The one thing I didn`t miss at all that has unfortunately returned is the wildfire smoke. Several area wildfires have already caused unhealthy air quality in South Lake Tahoe and Carson Valley. Latest HRRR smoke model output indicates smoke and poor air quality will continue to impact much of the central Sierra and western NV tonight through tomorrow. For the latest air quality in your location, visit -McKellar .LONG TERM...Saturday through next Thursday... Plan on cooler and potentially wetter conditions for Sunday into the beginning of the work week as extensive remnant tropical moisture surges into the Sierra and western Nevada. While hurricane Kay is projected to be well off the southern CA coast, the deep southerly flow will kick up precipitable water values across the region with many locations nearing the 1 inch mark. Widespread cloud cover may limit the potential for thunderstorms on Sunday, but any clearing may allow for some embedded convection to fire off. The question marks in the forecast involve the incoming trough off the West coast and how that will interact with the remnant hurricane and tropical moisture. Depending on where the shortwaves sweep through the region there could be a decent line of convective potential, but those details may be difficult to dial in until the higher resolution models are available. For now it appears the better potential for meaningful wetting rains will arrive with the trough on Monday or Tuesday, rather than with the initial moisture push over the weekend. While the precipitation forecast holds some uncertainty, we can say with relatively high confidence that the temperatures will be on the cool, more typical side of the spectrum. -Edan && .AVIATION... *Haze & Smoke - Smoke and haze from several wildfires burning in central and northern California will impact slantwise visibilities throughout much of western NV and the Sierra. MVFR visibilities in smoke and haze are possible at all terminals except for KMMH through at least Friday. *Storms - For this evening and on Friday, there is a 15-25% chance of showers and thunderstorms over mainly Alpine, Mono, and Mineral counties, primarily impacting KMMH. Storms will be capable of producing outflow wind gusts in excess of 40 kts. - McKellar && .REV Watches/Warnings/Advisories... NV...None. CA...None. && $$