Forecast Discussions mentioning any of "HRRR" "RAP" "RUC13" "RUC" "RR" received at GSD on 02/08/25


Area Forecast Discussion
National Weather Service Binghamton NY
1009 PM EST Fri Feb 7 2025 .SYNOPSIS... Lake effect snow showers continue across northern Onondaga and Oneida county this tonight.The lake effect snow will taper off and end by the mid to late morning hours on Saturday. Another low pressure system moves in Saturday evening into Sunday morning bringing widespread snowfall to Central NY and a wintry mix to Northeast PA. Lake effect snow showers redevelop heading into Sunday night with seasonably cold temperatures expected. && .NEAR TERM /THROUGH SATURDAY/... 955 PM Update... Cancelled the winter weather advisory for lake effect snow in southern Oneida county. Large low level dew point depressions and drier air is preventing the lake effect snow from reaching that far inland into the Mohawk Valley region. Only expecting another dusting to 1 inch overnight for the Rome/Utica area. Will let the Lake Effect snow Warning continue for now, but the same dry air mass is not allowing for much in the way of heavy snow across northern Oneida county. Latest model guidance shows some chance for a minor resurgence of the steadier lake effect snow overnight across the NW corner of the county; where up to 4 inches of additional snow may fall. 00z HRRR and NAM model data is coming in for the Saturday evening/night system. The HRRR is showing a mid level dry slot getting up into the Twin Tiers, which would taper off the steady snow and bring a period of freezing drizzle or light sleet pellets. Meanwhile the 00z 3km NAM keeps this mix a bit further south, confined to NE PA. There may still be an initial "thump" of heavy snow in NE PA, perhaps including the Wyoming Valley before that mid level dry slot and/or a small above freezing layer at 750-800mb moves in. Further north, across the northern Susquehanna region, northern Catskills and I-90 Corridor there will be a good FGEN forced band of snow; with much higher snow to liquid ratios on the order of 15-18:1 here. This may result in some higher snow totals in this area, despite modest QPF amounts in the 0.40 to 0.60 inch range. 720 PM Update... Lake effect snow continues to steadily stream off of Lake Ontario across far northern Onondaga county, and north-central Oneida county. The intensity has waned over the past few hours, but webcams in NW Oneida still show generally light ongoing snowfall. Will keep the Lake Effect Snow Warning and advisory going for now; but only expecting another 2-5 inches in northern Oneida and 1 to 2 inches additional for southern Oneida through Saturday morning. The rest of the forecast remains on track with just minor edits based on the latest CAMs and NBM. Snow amounts remain very similar for the Saturday night into early Sunday morning period. No other significant changes at this time. 130 PM Update... Lake effect snow bands off Lake Ontario remains the main weather feature for this forecast period. Much of the areas south of the Mohawk Valley has clear to partly cloudy skies as high cirrus will stream over the area through the afternoon and tonight. Gusty winds this morning have weakened to 20-30kts across the area, and should diminish this evening as a surface high works its way in from the west. Temps tonight will be cold, falling into the low to mid teens thanks to the high bringing light winds and locking in the colder airmass from the north. Lake effect snow will impact the Mohawk Valley into Northern Oneida county this afternoon into tomorrow morning. Satellite and radar returns show a strong upstream connection to the northern Great Lakes starting late this morning. This extra moisture riding over a decent fetch off Lake Ontario has allowed moderate snow showers to develop and stream over Oneida and northern Onondaga counties. This wide, cellular band will remain over this area into the evening hours. It is expected to slowly lift north as a surface high builds into the area this evening from Ohio and moves across the NY/PA border. This will cause the wind field to be more WSW vs the current WNW flow. Currently, the Lake Effect Snow Warning for northern Oneida county and the Winter Weather Advisory for southern Oneida county look on track with timing and amounts. 6-9 inches of snow should fall across central and western Northern Oneida county, while 1-5 inches is expected across southern Oneida county. Here, the low end numbers will be in the southern portion of the area while the higher numbers will be to the north where the snow showers are expected to reside the longest. The snow should dissipate by mid morning as the center of the high moves east of CNY, bringing southerly flow and cutting off the wind field`s access to the lake. Temperatures will rise into the mid 20s to low 30s Saturday afternoon as the southerly flow should be able to advect in a slightly warmer airmass. A brief quiet period will be present in the afternoon before the next storm system moves into the region Saturday afternoon. Light snow should move from west to east, entering our western counties late in the afternoon. Up to 0.5 inches should fall during this period before the bulk of the snow moves in later in the night. && .SHORT TERM /SATURDAY NIGHT/... 345 PM update... A quick moving system will bring a burst of snow to the region Saturday night into Sunday morning. This low amplitude pattern along with a surface low over the Ohio Valley and an upper level short wave over the Great Lakes will track east into the region. Both features will merge, placing the area in the left exit region of an upper level jet streak. This along with some fgen will help to enhance lift especially during the 0Z to 6Z period. Although it is important to note that the best fgen will be east of our region. Another important factor will be how quickly dry air surges into the region from 6Z to 12Z, this could impact how much QPF we receive. Otherwise models mostly agree on a somewhat colder solution with only the GFS pushing warmer air into the Wyoming valley. Looking at model soundings, most of the area should remain below freezing through the upper levels with mostly snow expected. Although freezing rain and sleet will be possible over northeast PA as the warm nose nudges in. Otherwise models begin to unzip with dry air pushing in Sunday morning. A brief period of freezing drizzle will linger into the early portion of Sunday morning as conditions dry out over the DGZ, but remain saturated through the lower levels. With differences in 850 mb temperatures across the region, there will be a fairly decent range in terms of snow ratios. There is still quite a bit of variation in QPF, the NAM being the drier solution and the GFS trending higher,overall blended the NBM with WPC. In terms of headlines, went with advisories across the board as confidence wasn`t high enough for a Winter Storm Warning. Snow totals are borderline over central NY with amounts ranging 4 to 7 inches at most. All of northeast PA was also included in an advisory with snow amounts ranging 2 to 5 inches along with ice accumulations up to a tenth of an inch. && .LONG TERM /SUNDAY THROUGH FRIDAY/... Northwest flow behind a departing system will keep clouds around and produce some scattered lake effect snow showers. Model soundings Sunday morning do show a fair amount of dry air intrusion for a time which introduces some mention of freezing drizzle. Any snowfall accumulation looks to be under an inch with highs generally around 30. Winds become more westerly Sunday night shifting the main axis of lake effect closer to the NY Thruway with additional light accumulations of snow. Temperatures look to be several degrees cooler Monday with the renewed shot of arctic air. High pressure over the region may give us a window with light winds and slightly lower cloud cover. This should be our coldest night with single digits for lows. A very active and wintry pattern continues given the base state of arctic cold shots (-EPO,WPO) and blocking (-AO,NAO) countered by a -PNA which promotes a ridge over the southeast. As a result, several low pressure systems look to track from the Southern Plains into the Ohio Valley and Mid-Atlantic states from Tuesday till the end of next week. For the most part several rounds of snow are expected. However, there is potential for the system late Wednesday into Thursday to track far enough north for a brief interval of rain or freezing rain. It is too early to pinpoint snow accumulations given quite a bit of ensemble variability is present. The strongest of the low pressure systems departs by Friday with a return to northwest flow and the potential for some light lake effect snowfall. Generally teens for lows and 20`s/30`s for highs. && .AVIATION /03Z SATURDAY THROUGH WEDNESDAY/... Lake effect snow will continue over RME through most of the overnight hours. While conditions have improved there, restrictions will likely bounce between IFR and VFR. By around 10z, the snow will come to an end but lake clouds will keep ceilings low until after 18z Saturday. All other terminals are VFR and will be for the majority of this TAF period. Snow will move into the region late in the day on Saturday and that could bring some restrictions to ELM and AVP, but there remains uncertainty on the timing. All terminals are no longer reporting gusts but some gusts will remain possible over the next few hours. Otherwise, winds become light and variable overnight and then settle out of the southeast at around 5 to 10 kts Saturday afternoon. Outlook... Saturday evening and night...Restrictions likely (IFR or lower) with steady snow and perhaps some wintry mix moving through the area. Sunday...Snow tapers off to scattered lake effect snow showers and flurries; restrictions possible (especially NY terminals) Monday...A few lake effect snow showers or flurries possible; restrictions possible for CNY terminals. Mainly VFR at AVP. Tuesday through Wednesday...Snow and associated restrictions beginning late Tuesday. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...Winter Weather Advisory from 4 PM Saturday to 7 AM EST Sunday for PAZ038>040-043-044-047-048-072. NY...Lake Effect Snow Warning until 10 AM EST Saturday for NYZ009. Winter Weather Advisory from 4 PM Saturday to 7 AM EST Sunday for NYZ009-015>018-022>025-036-037-044-045-055-056. Winter Weather Advisory from 7 PM Saturday to 7 AM EST Sunday for NYZ046-057-062. && $$ SYNOPSIS...MJM NEAR TERM...JTC/MJM SHORT TERM...ES LONG TERM...MWG AVIATION...BTL
Area Forecast Discussion
National Weather Service Bismarck ND
938 PM CST Fri Feb 7 2025 .KEY MESSAGES... - Snow will continue along and south of Interstate 94 through this evening, tapering off from west to east late tonight into early Saturday morning. - Dry conditions with below normal temperatures are expected for the rest of the weekend. - Arctic air returns next week, with dangerously cold wind chills as low as 35 to 45 below zero at times. && .UPDATE... Issued at 937 PM CST Fri Feb 7 2025 Snow continues to fall across the southern half of the state late this evening. Snowfall rates implied from radar and surface visibility have significantly decreased west of the river, and to a lesser extent east of the river. SPC mesoanalysis still shows strong 700 mb frontogenesis over south central and southeast North Dakota, but this should begin to wane over the next few hours. Lighter snow is likely to continue until a deamplification of mid-level winds and vorticity later tonight. Confidence is increasing that extensive cloud cover will persist through the night across most of the region. A more substantial boost to overnight low temperatures was made with this update, with single digits below zero now forecast across the north rather than teens below. UPDATE Issued at 711 PM CST Fri Feb 7 2025 Mesoscale banding over south central North Dakota has become less intense and more broad over the past hour or so, and has now shifted out of southwest North Dakota. The transition of the banding characteristics has likely resulted in a decrease of snowfall rates for some areas (such as Bismarck/Mandan), but an increase for others. RAP guidance continues to advertise several more hours of mid level frontogenesis along and south of I-94 from Bismarck to Jamestown, with peak intensity around 8-9 PM CST. No changes to the warning or advisory are needed at this time. In other forecast news, satellite imagery shows a large stratus deck extending into southern Saskatchewan/Manitoba, and trends would suggest a high probability that these clouds will mostly remain over northern parts of the state through the night. If this does happen, our low temperature forecast will be far too cold. Even if there is clearing, we are skeptical of the inherited forecast of lower to mid teens below given the nearest teens below dewpoints are up in central Manitoba. For now, just a slight bump in overnight temperatures was made across the north until confidence in the clouds persisting is higher. Because of this trend, there is also now less concern for wind chills falling below advisory criteria levels of 30 below later tonight. UPDATE Issued at 441 PM CST Fri Feb 7 2025 Radar shows a narrow band of heavy snow persisting from around Baker, MT to Bismarck and Steele. Upstream trends suggest little to no change in the positioning or strength of the banding over the next few hours, and 1 to 2 inch per hour rates are being observed under the band at our office. The Winter Storm Warning has been expanded north into Stark, Morton, Burleigh, and Kidder Counties. Oliver County is also now under a Winter Weather Advisory. The 4 counties that were added to the warning are now expected to have a narrow corridor of 5 to 7 inches of total snow accumulation, focused over southern parts of each of those counties. && .DISCUSSION... Issued at 235 PM CST Fri Feb 7 2025 Inverted surface trough combined with a frontal boundary and upper level wave will continue snow to the southern half of North Dakota today through much of tonight, and into Saturday morning for some eastern areas. Low to mid level frontogenesis appears to be peaking now through this evening, creating a decent band of snow across the southern tier of counties in ND. These counties have been upgraded to a Winter Storm Warning as total snow accumulations of 4 to 8 inches are now expected. Meanwhile along the Interstate 94 corridor, snow looks to have shifted far enough north for snow accumulations of 2 to 5 inches in these areas. Thus a Winter Weather Advisory has been issued for counties along Interstate 94 for today into Saturday. If the band further shifts more north then near 6 inches of snow are possible in these areas. For now the warning remains in the highest confidence areas. Winds look to be limited with this system, although there is a brief window of blowing snow tonight in central portions. Areas not in winter highlights could see at least a slight chance of snow, although north of Highway 2 appears to be the cutoff for this slight chance. These northern areas will start to feel the effects of a surface high and cold northerly flow. Low temperatures in the north tonight will be in the teens below zero, with single digits below zero south. Wind chills along the Canadian Border tonight could be near Cold Weather Advisory criteria especially Saturday morning. Given the brevity of these colder wind chills will hold off on any cold weather products at this time. Surface high moves in on Saturday ending snow from west to east in the morning and bringing clearing skies. Perhaps some breezy winds linger in eastern portions through Saturday, although they look to be just low enough to limit blowing snow impacts. Highs on Saturday will generally be in the range of 5 to 15 degrees above zero. Surface high is replaced by mainly dry northwest flow Saturday nigh through Sunday. Some breezy winds may again be found on Sunday, although look to be below advisory criteria. Cold temperatures will continue to filter into the region with lows Saturday night in the single digits below zero, and highs on Sunday again in the 5 to 15 degree range. Generally light winds Saturday night and Sunday morning should limit wind chill impacts. Very cold temperatures then return Sunday night through much of next week. Arctic front looks to push through Sunday night through Monday. There could be some light snow with the passage of this front, although NBM pops are mainly dry at this time. The bigger concern will be the dangerously cold temperatures and wind chills. These wind chills look to be Cold Weather Advisory levels Sunday night through Monday (colder than 30 below). Surface high behind the arctic front reinforces the cold air Monday night through Tuesday. At this time this looks to be the coldest day of the week, with air temperatures in the 20s below zero and wind chills in the 40s below zero. Tuesday night could see continued dangerous cold that lingers into Wednesday morning. The rest of next week continues to look very cold with the arctic airmass lingering across the state. Low temperatures near 20 below zero could linger in the north with teens below zero lingering in the south. High temperatures each day look to remain in the single digits below zero north to the single digits above zero south. Surface high should keep mainly dry conditions through mid week, although moisture passing in northwest flow aloft could bring periods of clouds at times. Later in the week NBM returns chances for snow as warm air advection aloft could return. This will be dependent on a Pacific trough forming off the west coast which most clusters have. This may not move far enough inland to bring significant warming. This shows up in the NBM temperature trends and spreads as only a slight warmup is being forecast by next weekend. This is also being shown in the CPC 6 to 10 and 8 to 14 day outlooks. && .AVIATION /00Z TAFS THROUGH 00Z SUNDAY/... Issued at 937 PM CST Fri Feb 7 2025 Snow will continue to cause MVFR/IFR visibility along with MVFR ceilings across southern North Dakota late this evening, with conditions improving from west to east late tonight into early Saturday morning. VFR conditions are otherwise likely to prevail, but there is a small chance for low ceilings developing across parts of western and central North Dakota during the day Saturday. Winds will primarily be northeast to northwest around 5 to 10 kts. && .BIS WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory until 9 AM CST Saturday for NDZ020-037. Winter Weather Advisory until 2 AM MST Saturday for NDZ031-032. Winter Storm Warning until 3 AM CST /2 AM MST/ Saturday for NDZ033-040>045. Winter Storm Warning until 9 AM CST Saturday for NDZ034>036- 046>048-050-051. && $$ UPDATE...Hollan DISCUSSION...Anglin AVIATION...Hollan
Area Forecast Discussion
National Weather Service Dodge City KS
559 PM CST Fri Feb 7 2025 .KEY MESSAGES... - Dense fog likely (greater than 60% chance) tonight for much of southwest Kansas, and a Dense Fog Advisory is now in effect for all but the far western counties tonight through early Saturday morning. - Two storm system early next week will yield accumulating snow across much of Kansas. - The second of the two systems Tuesday Night into Wednesday looks to be the more impactful system with more widespread 2"+ snow potential and very cold temperatures. && .DISCUSSION... Issued at 356 PM CST Fri Feb 7 2025 There are several forecast challenges over the coming days and into next week, including dense fog tonight and snow/cold early to mid next week. This afternoon`s RAP analysis and water vapor imagery revealed a largely zonal pattern across much of the CONUS. There was an upper level jet streak moving across the Great Basin region east- northeast toward the Northern Plains. The shortwave trough tied to this jet streak was pushing east across Montana, which was where the most unsettled weather was occurring re accumulating snow. The surface wind field across our southwest Kansas region was slowly responding to the increasing pressure falls with a southeasterly wind becoming more uniform across Kansas into northern Oklahoma. This is important because higher dewpoints were found just to our south across northern Oklahoma which will slowly advect northwestward this evening. The increased dewpoints will eventually manifest as fog, likely dense, beginning late this evening most likely. HRRR runs today have been quite aggressive in visibility falling to 1/4 mile by 03Z and after, along with other CAMs. The HREF probabilities, thus, are quite high for dense fog with a growing area of 50%+ probabilities 1/4 mile visibility, especially after 06Z across the eastern half of the DDC CWA. We have issued a Dense Fog Advisory for the above discussed reasoning from 9 PM CST tonight to 9 AM tomorrow morning. The dense fog is likely to erode fairly quickly from northwest to southeast when the next cold front moves south early Saturday morning. North winds behind the front will be strong, and 5-8 mb/3h MSLP rises in the morning will support wind gusts 35 to 45 mph at times, particularly in the 14-18Z time frame Saturday morning. The pressure gradient will slowly relax in the afternoon with winds tapering off to around 15 mph late in the afternoon. Looking ahead to early next week, the next forecast challenge will be accumulating snow. Successive shortwave trough passages will lead to enhanced 800-700mb frontogenesis, which will be the primary forcing mechanism for ascent. The first of these disturbances will arrive late Monday/Monday Night at the same time an arctic front meets up with advancing gulf moisture from Texas. The global model consensus for the best window of light accumulating snow with Wave #1 is mid evening Monday through roughly mid morning Tuesday. Latest 100-member Grand Ensemble 75th percentile shows around 1/2 to 1" snowfall focused mainly on the northeastern half of the DDC CWA. The first wave will move east quickly on Tuesday, but will be followed quickly be a slightly stronger Wave #2 Tuesday Night into Wednesday. With Wave #2, 800-700mb frontogenesis will be stronger as the thermal gradient will be stronger along with better convergence and deformation in this layer as well. 700mb temperatures will be colder as well, and this would loosely translate to higher snow-to-liquid ratios of around 15:1. For Dodge City in particular, latest 25-75th percentile QPF shows 0.07-0.31" range off the Grand Ensemble, and if we use a conservative 12:1 SLR, that would result in 0.8-3.7" snowfall. The upshot is that the 2nd system is likely to be the more impactful for southwest Kansas with colder temperatures/wind chills and more accumulating snow. && .AVIATION /00Z TAFS THROUGH 00Z SUNDAY/... Issued at 553 PM CST Fri Feb 7 2025 Light upslope winds and a moist air mass will lead to fog formation by 03-06z at KGCK and KDDC. Visibilities will likely drop to 1/2 mile or less. There is uncertainty in how far east the fog will develop so that KHYS may keep MVFR visibilities and CIGS. North winds at 10-12 kts will develop after 06z and then increase to 15 to 20 kts by 12z in the wake of a cold front. The stronger winds will break up the fog by 10-11z at KGCK and KDDC. With daytime heating by 14-15z, expect north winds to increase to 20-25 kts along with VFR conditions. && .DDC WATCHES/WARNINGS/ADVISORIES... Dense Fog Advisory from 9 PM this evening to 8 AM CST Saturday for KSZ030-031-043>046-062>066-075>081-085>090. && $$ DISCUSSION...Umscheid AVIATION...Finch
The main focus of this forecast discussion will be regarding the
freezing drizzle potential over central and southern Iowa and will
have a more brief discussion regarding the light snow for northern Iowa. Monitoring a couple areas for moisture analysis this afternoon for the freezing drizzle potential as there is a wide variety in the initialized 0-1.5km moisture by the deterministic models. The first is over the Missouri/eastern Kansas/eastern Oklahoma area where the most robust models like the HRRR/RAP are over initializing this moisture and with each RAP run, it backs off only to try to force more moisture into the solution 3 hrs out. It is also over initialized in moisture in the second area of focus over northwest South Dakota. The 12 NAM moisture initialization was better and it had a good solution regarding the moisture progression into Iowa, though note the 18z solution is back to the over moist low levels NAM bias. Then models such as the GFS tend to have too dry of solutions of low level moisture. This system is very different from the freezing drizzle event on Wednesday though both have little to no ice introduction into the saturated layer. The easterly flow from the high pressure to the east is very pronounced and will impact the low level saturation and in fact, several model solutions are keeping cloud bases AOA 1kft, which is not favorable for drizzle formation. Also, reviewing areas with condensation pressure deficits within that 0-1.5km layer, these are sporadic and short duration when they do occur. In addition, the low level isentropics levels (290K-300K) show near neutral flow and then down glide (subsidence) after 12z. Due to these potential negative factors for freezing drizzle production, do not have high enough confidence in widespread and impactful freezing drizzle. Will need to continue to monitor through tonight on how much moisture does return and how that low level saturation process proceeds. Obviously should the widespread moderate freezing drizzle indeed develop, then some icing impacts are quite possible. Perhaps this occurs within the moisture axis along the trough that will move through in the morning. Again, that should be brief though if it did occur due to the quick eastward progression. Light snow is still expected over northern Iowa where deeper saturation occurs and ice introduction should occur. That said, there is event a wedge of dry air around 700 mb that could impact the precipitation over northern Iowa that may limit the amount of precipitation and perhaps there could be brief periods with a loss of ice introduction and freezing drizzle potential. Still have 1-2 inches of snow in the forecast. Breezy conditions during the afternoon around 25 mph could cause some minor blowing snow but with no current snow cover, it should be limited. Colder air will follow the system for Sunday and into much of next week. Next week still looks more active which could result in a few rounds of light snow especially over central and southern Iowa. Arctic high pressure will be situated north of Iowa during much of this period and the dry air originating from this high could have a big impact on precipitation chances during the period. && .AVIATION /00Z TAFS THROUGH 00Z SUNDAY/... Issued at 545 PM CST Fri Feb 7 2025 VFR conditions continue through the evening hours but ceilings will start to drop overnight and continue to lower to at least MVFR into Saturday morning. Some IFR possible at times during precipitation which will be in the form of mainly snow in northern Iowa near KMCW, and a mix of freezing drizzle and snow towards KFOD and KALO prior to the start of snow or after with loss of ice introduction. Further south, freezing drizzle remains the main precipitation type for KDSM and KOTM, though some uncertainty remains with freezing drizzle timing and impacts especially so left with Prob30 groups at this time. Edits may certainly be needed in impacts/timing at all sites as precipitation develops, especially to visibilities which also remain more uncertain. Precipitation ends around midday into early afternoon with overall aviation conditions improving through the later afternoon into evening hours Saturday. && .DMX WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Donavon AVIATION...05
Area Forecast Discussion
National Weather Service Austin/San Antonio TX
536 PM CST Fri Feb 7 2025 ...New AVIATION... .SHORT TERM... (Tonight through Saturday night) Issued at 222 PM CST Fri Feb 7 2025 Key Messages: - Patchy dense fog Saturday and Sunday morning - Unseasonably warm, near record to record high temperatures Saturday Dew points this morning across our area were few degrees higher than yesterday, resulting in slightly more widespread and persistent morning and early afternoon cloud cover. While this has slightly delayed warming and should keep temperatures below daily records today, daytime highs will still rise into the 80s regionwide with clouds currently clearing, reaching the 90s in Dimmit County. Daily record highs for today and tomorrow are provided in the Climate section below for reference. There won`t be any changes to the broader weather pattern in the short-term, so Saturday will play out very similarly. Dew points remain elevated, so overnight lows will once again be mild in the low- to mid-60s. Low stratus and patchy to areas of fog should redevelop overnight and spread across the region from the southeast, with higher probabilities for dense fog over the southern Edwards Plateau and Rio Grande Plains. Dew points Saturday will be a few degrees lower than today, so expect morning clouds to break a little faster Saturday outside of some residual cumulus persisting over the Balcones Escarpment. This will set up more substantial warming to near- or record-breaking highs in the upper-80s to low-90s for most of our area. Saturday night, a shallow cold front will approach our region from the north, though the gentle slope of the front and stable air aloft will likely preclude any rainfall ahead of the front. The front should reach the Burnet, Williamson, and Llano counties by sunrise Sunday. These locations may be able to dip into the 50s, but conditions elsewhere Saturday night will once again be damp and mild with lows in the 60s, patchy fog, and low clouds. && .LONG TERM... (Sunday through Friday) Issued at 222 PM CST Fri Feb 7 2025 Key Messages: - Cold front to bring colder temperatures across the Hill Country and Austin metro area on Sunday, still unseasonably warm Sunday south of the front along the Rio Grande and Coastal Plains - Rain chances return late Monday night through Wednesday - High uncertainty in temperature forecast Monday through Wednesday We are now into the hi-resolution model range for Sunday, which typically handle the southward extent of shallow cold fronts better than the global models. With that said, the HREF members have the front at least into the far northern CWA pre-dawn Sunday, with the 3KM NAM and 18Z HRRR to the I-10 corridor by noon. This creates a tricky temperature forecast, with a very large high temperature spread across the CWA, as well as a bust potential. We have trended the forecast for Sunday significantly colder across the Hill Country and into the Austin metro area, where confidence is a higher that the front will be through this region in the morning. There is still room to go lower across these northern areas, with high temperatures potentially only in the upper 50s to lower 60s. Across the southwest CWA, along the Rio Grande and across the Winter Garden region south of the cold front, high temperatures in the 80s are forecast The position of the shallow cold front gets even trickier on Monday across southern areas, and then Tuesday as a disturbance aloft approaches the area. Low chances (20%) for light rain and isolated showers are forecast Monday near and just north of the front. Better chances for showers (30-50%) and isolated thunderstorms are forecast late Monday night through Tuesday with the aforementioned disturbance. The upper level pattern becomes more amplified for the latter half of the week, allowing for a slightly stronger cold front to push through the area. There is low confidence on when this front moves through the area, ranging anywhere from Tuesday night to Wednesday night. This makes the Wednesday temperature and PoP forecast low confidence. && .AVIATION... (00Z TAFS) Issued at 526 PM CST Fri Feb 7 2025 Persistence type weather continues with hot afternoons setting up for another VFR evening, at least early on. Cigs tonight are forecast to arrive slightly earlier to pick up on the hint that the stratus clouds were slower to erode today. The continued warming trend is helping with keeping fog to a minimum, so will keep the VSBY up tonight to reflect a continuation of last night. && .CLIMATE... Issued at 222 PM CST Fri Feb 7 2025 RECORD MAX TEMPERATURES FRIDAY AND SATURDAY 02/07 02/08 AUS 88/2017 86/2017 ATT 86/2017 87/2017 SAT 86/2017 88/2017 DRT 93/1937 90/2017 && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 67 86 62 64 / 0 0 0 0 Austin Bergstrom Intl Airport 65 87 63 67 / 0 0 0 0 New Braunfels Muni Airport 65 87 65 73 / 0 0 0 0 Burnet Muni Airport 64 85 55 59 / 0 0 0 0 Del Rio Intl Airport 64 89 63 81 / 0 0 0 0 Georgetown Muni Airport 66 86 55 61 / 0 0 0 0 Hondo Muni Airport 62 87 62 76 / 0 0 0 0 San Marcos Muni Airport 64 87 64 72 / 0 0 0 0 La Grange - Fayette Regional 66 86 66 74 / 0 0 0 0 San Antonio Intl Airport 65 87 65 75 / 0 0 0 0 Stinson Muni Airport 65 88 65 78 / 0 0 0 0 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && $$ Short-Term...18 Long-Term...76 Aviation...Tran
Area Forecast Discussion
National Weather Service Goodland KS
235 PM MST Fri Feb 7 2025 .KEY MESSAGES... - Another night of freezing fog, perhaps dense is forecast tonight mainly along and east of Highway 83. - Breezy northerly winds gusting 40 to 50 mph during the morning hours Saturday before slowly decreasing through the afternoon. - 20%-30% chance for light snow showers along/north of the KS/NE border Saturday night-Sunday morning with little if any accumulation expected. - Increasing chances for much colder temperatures and light snowfall Monday night through Wednesday. - Dangerously cold wind chills below zero Monday night, Tuesday night and Wednesday night. && .SHORT TERM /THROUGH SUNDAY NIGHT/... Issued at 1252 PM MST Fri Feb 7 2025 One area of fog and stratus erodes and the next round moves in. The eroding fog and stratus across eastern Colorado does look to impact the high temperatures across the western portion of the area so have lowered high temperatures. Further to the east the next round of stratus is moving in which is considerably early according to guidance. This will be the main focus through the evening will be to see how dewpoint depressions react as the sun sets as the current expectation is that there will be a struggle for temperatures to fall to much as we already have the low stratus in place. There will again be some weak moisture advection with dew points rising into the mid to upper 20s. There was some consideration given to issue a Dense Fog Advisory for Gove, Graham and Sheridan counties this evening but with the concern about the dew point depression my confidence in a long duration dense fog event is only around 30% at this time. I do think there will be periods of dense fog (50%) in the counties that was considered but again given the concerns about how long and the coverage should it develop, opted to hold off on headlines at this time. A cold front is forecast to move through the area overnight which will shunt any fog and stratus out of the area. As cold fronts typically do have the tendency to move through a little quicker than what guidance suggests was another reason to hold off of the Advisory. The front is forecast to be a dry front but the main story with this does appear to be the wind. Very strong pressure rises ranging from 7 to 11mb over three hours is seen via the GFS, NAM and RAP so have increased the wind gust potential with this to around the 40 to 50 mph range. The front looks to move through around 2-4am MT and is currently situated across central South Dakota at this time. The windiest conditions look to occur along and south of a Norton to Cheyenne Wells line around mid morning and then will decline through the remainder of the day. During the day Saturday I did add in a couple areas of flurries as well as there does appear to be some subtle lift, weak mid level moisture and ice in the clouds. Not anticipating anything like what occurred earlier in the week with an unanticipated couple tenths of snow accumulation as there doesn`t appear to be any surface based CAPE present to support this and there is drier air at the surface as well which makes me think that flurries would be the most likely outcome. High temperatures were also nudged down a few more degrees due to the better signal for cloud cover and continued cold air advection into the area. Saturday night, a slightly better potential for light snow remains for northern portions of the area. I continue to see a dry layer near the surface which is keeping me from going higher on pops. Due to the higher elevation across the northwest portions of the area this may be enough to overcome some of those concerns so am leaving those areas in a 25-30% chance and rapidly declining the further south you go. At this time light accumulation less than a half inch is currently forecast with minimal if any impacts currently seen. Sunday will continue to see southeast flow across the area keeping cloudy skies in place for the majority of the day before ending west to east as some drier air associated with some subtle surface troughing moves in. High temperatures are currently forecast in the upper 30s to low 40s but if the cloud cover can linger longer than currently forecast then high temperatures may be to warm as 850mb temperatures remain around -1C. && .LONG TERM /MONDAY THROUGH FRIDAY/... Issued at 130 PM MST Fri Feb 7 2025 Focus continues to be on the Arctic air and light snow which will impact the area Monday night through Thursday morning. After highs in the 30s Monday afternoon, temperatures will fall into the single digits behind the Arctic front Monday night. Tuesday and Wednesday will be the coldest days of the period with highs in the teens and lows in the single digits above/below zero. Wind chills will generally be in the 10 to 15 below range Tuesday, Wednesday and Thursday mornings, with a low probability (around 20%) of meeting wind chill criteria (15 below) for an advisory. The Arctic air will try to move out Thursday and Friday with temperatures closer to normal, though model spread remains quite high both days with regards to temperatures. Snow chances begin Monday afternoon across southwest Nebraska and Monday evening in the rest of the area. There appears to be two general rounds of snow. The first Monday night through Tuesday morning with the front and a northern stream shortwave, then the second Tuesday night through much of Wednesday with a second shortwave moving across the Rockies. May see a brief break between the systems Tuesday afternoon. Each system has the potential to bring a few inches of light snow, with the second round perhaps slightly more than the first with better dynamics from a stronger shortwave which moves directly over the area. Total amounts across the area from both systems currently run in the 3-6 inch range (model average) with impacts mitigated somewhat by the extended time frame in which it falls. Still not seeing much in the way of wind with this event. Snow begins to wind down Wednesday afternoon and Wednesday night. Thursday appears dry at this time. There could be another system sneaking in Friday night with another round of light snow. Models generally show less than one inch with it, but there is considerable spread, so confidence is low at this time on any potential impacts. && .AVIATION /00Z TAFS THROUGH 00Z SATURDAY/... Issued at 230 PM MST Fri Feb 7 2025 Stratus this afternoon eroded before making it to the KMCK terminal but with it still lingering a county east and county south will maintain a FEW025. For KMCK through the evening confidence has increased a little regarding IFR visibilities and ceilings impacting the terminal. The question will be how long will it last as a cold front moves across the area overnight. If the fog can persist then dense fog is possible along with some icing due to freezing fog. KGLD at this time is not forecasted to see any fog or stratus concerns at this time. As the cold front sweeps through winds will become northerly and breezy to gusty. Confidence has also increased in stronger wind potential with the stronger winds currently favoring KGLD where gusts around 40 knots is possible. Winds will persist through the morning Saturday before slowly waning. A period of flurries or light snow is possible through the morning hours (mainly after 14Z) for KGLD but not anticipating and flight category impacts. Confidence in the flurries or light snow is around 10% at this time. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...None. CO...None. NE...None. && $$ SHORT TERM...Trigg LONG TERM...024 AVIATION...Trigg
Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
652 PM CST Fri Feb 7 2025 .KEY MESSAGES... - Narrow Winter Storm Warning issued across central Minnesota into northwest Wisconsin. - Accumulating snow late this eveningthrough Saturday morning and early afternoon. - Widespread snow amounts around 3 to 5 across central Minnesota and western Wisconsin. Pockets of higher amounts (6+) are possible, especially across western Wisconsin. - Well below normal temperatures will move in behind the Saturday system, with sub-zero lows Sunday night and even colder lows (negative teens to 20s) Monday through Wednesday. && .UPDATE... Issued at 639 PM CST Fri Feb 7 2025 We decided to upgrade a narrow swath of our area into a Winter Storm Warning. This follows near where the HRRR is showing storm total QPF near 0.4", which when converting to snow with an expected ratio of 16 or 17 to 1 pushed snow totals up into the 6-7" range over about a 20-30 mile wide west-east oriented band. This enhanced snowfall is being largely aided by the appetizer of snowfall we`ve seen develop over central MN within a strong zone of h7-h6 fgen. With the main entree still back over southern NoDak (where the SPC issued an MCD for heavy snowfall), we felt comfortable enough to squeeze a very narrow extension of the Winter Storm Warning out of the south end of the Grand Forks NWS coverage area across the northern boundary of ours. This may not be the only headline update needed though. We`ll see what the 00z HRRR does, but right now, there is little difference in our snow forecast between Mankato and Albert Lea and Fairmont, so we may be looking to add the I-90 corridor into the advisory as well since there is currently little difference in the forecast for the I-90 corridor and the advisory off to its north. && .DISCUSSION... Issued at 251 PM CST Fri Feb 7 2025 The forecast has not changed much over the last 12 hours, with accumulating snow moving into western Minnesota by this evening. A deepening surface low to the south will provide weak warm air advection at the same time high pressure moves south from Canada. This setupwill lead to a frontogenetically-driven snow event for the Upper Midwest. As is often the case with fgen driven snow, there will be bands of higher QPF/snow amounts. Determining exactlywhere those bands will set up can be difficult, but a general consensus between the models indicates it will be just north of the Twin Cities Metro (but south of Duluth). From a timing perspective, light snow will begin in western Minnesota as early as 7-8PM, but the more intense snow wont start for a few hours after that. The Metro area likely wont see much snow accumulate prior to midnight, but the rates will peak shortly after in the 2-7AM timeframe. Western Wisconsin likely wont see anything until after midnight,but things will linger slightly longer into the early afternoon hours on Saturday. All-in-all, this event will take place when the vast majority of people are sleeping, which is good from an impact point-of-view. Areas in western Wisconsin may see more travel impacts due to the later arrival and shift into more of the daylight hours. As mentioned above, there will be a band of higher QPF in central/eastern MN and western WI. Guidance continues to indicate 0.3 to 0.4 QPF will fall within this band, tapering to 0.25 in the Metro, and quickly dropping to 0.15 or less for the far southern portion of Minnesota (Mankato and south). This will be a more light and fluffy snow, with snow to liquid ratios slightly above the climatologicalnorm in the 14-18:1 range. The lower ratios will be in areas just south of the Metro as weaker forcing and drier air will inhibit anything higher. Equating this to snow amounts, 3 to 5 can be expected for most across our forecast area, with lesser to the south.Again with the fgen banding, the location of the band will be where we see the highest ratios and snow rates. These locations are also most likely to see 6+ of snow. Although QPF amounts have noticeablydropped since forecasting for this event began, whether or not a specific location sees 5 or 6 wont make a difference in terms of impacts. The biggest takeaway should be that it will snow and it will need to be plowed for the majority of southern and central Minnesota and western Wisconsin. Taking a look at current Winter Weather headlines, we have expanded the Winter Weather Advisory to cover our entire area, minus the southernmost tier of counties in Minnesota (along I-90). This advisory is mostly due to expected snow amounts and associated travel impacts. There is a limited potential for blowing snow in SW MN, but nothing major due to lower snow amounts and a short time frame of concern. Looking to Sunday and beyond, things will get cold. Canadian high pressure will settle in behind the departing low, dropping high temperatures into the single digits with even colder apparent temps. Monday, Tuesday, and Wednesday night lows will be the coldest of the week, with wind chills in the negative 20s in western Minnesota. Western Wisconsin will be roughly 10 to 15 degrees warmer, but still below zero. Looking into longer term chances at any more weather makers, there is decent agreement between ensembles for a few systems over the next two weeks, but none of which are looking significant. This means our pattern of a light dusting to half inch here and there will continue beyond this weekends system. && .AVIATION /00Z TAFS THROUGH 00Z SUNDAY/... Issued at 554 PM CST Fri Feb 7 2025 Forcing along a band of 700-600 mb fgen has resulted in a narrow, east-west band of snow to setup across central MN. It started out in AXN and STC, though it may nudge north of STC shortly. This band has also resulted in moving up the mention of snow at RNH. For all other terminals, this band remain north of them and as a result, delayed some the start of snow at RWF, MKT, & MSP. Behind the snow, winds will increase out of the NW, but not enough to create BLSN. Other bit of uncertainty at this point behind the snow is how quickly will MVFR cigs clear out, though that is more of an issue for the 6z TAF period. KMSP...Still anticipating about 3" of snow at MSP. Arrival of snowfall is starting to creep back an hour or two, likely starting between 8z and 10z. The heaviest snow, with snow rates around 0.5" per hour, will come between 12z and 17z. /OUTLOOK FOR KMSP/ SUN...VFR. Wind NW 5-10 kts becoming W. MON...VFR. CHC MVFR cigs. Wind NW 5-10 kts. TUE...VFR. Wind NW 5-10 kts. && .MPX WATCHES/WARNINGS/ADVISORIES... MN...Winter Storm Warning until 3 PM CST Saturday for Benton- Douglas-Isanti-Kanabec-Mille Lacs-Morrison-Sherburne- Stearns-Todd. Winter Weather Advisory until 3 PM CST Saturday for Chippewa- Kandiyohi-Lac Qui Parle-Meeker-Pope-Redwood-Renville- Stevens-Swift-Yellow Medicine. Winter Storm Warning from 10 PM this evening to 6 PM CST Saturday for Chisago. Winter Weather Advisory from midnight tonight to 6 PM CST Saturday for Anoka-Blue Earth-Brown-Carver-Dakota-Goodhue- Hennepin-Le Sueur-McLeod-Nicollet-Ramsey-Rice-Scott- Sibley-Steele-Waseca-Washington-Watonwan-Wright. WI...Winter Storm Warning from 10 PM this evening to 6 PM CST Saturday for Barron-Chippewa-Dunn-Polk-Rusk. Winter Weather Advisory from midnight tonight to 6 PM CST Saturday for Eau Claire-Pepin-Pierce-St. Croix. && $$ UPDATE...MPG DISCUSSION...PV AVIATION...MPG
AREA FORECAST DISCUSSION
National Weather Service Charleston WV
931 PM EST Fri Feb 7 2025 .SYNOPSIS... Potent, moisture-laden systems will impact the area Saturday, and early to mid next week, each with heavy rain, and mixed wintry precipitation. && .NEAR TERM /THROUGH SATURDAY/... As of 930 PM Friday... Have updated the forecast by inserting some chances for precipitation along the southern coal fields and southeastern WV to account for incoming light showers from the west. The rest of the forecast is on track. As of 545 PM Friday... Quiet weather persists until the overnight. The forecast is on track with only minor changes to certain parameters such as winds. Will re-evaluate later to see if anything has to be updated or not. As of 200 PM Friday... A high pressure system will provide dry weather this evening before sliding off to the northeast. A system will then push precipitation into the area late tonight into Saturday. With the high providing a light northeast flow over the lowlands and a southeast flow over the mountains, there is some concern that precipitation could start as freezing rain or snow, before turning over to rain. In the lowlands this transition will be quick with a couple hours difference in the precipitation or rising temperatures making a difference. Confidence is not high enough at the moment to issue an advisory for the lowlands, but if any problems should occur, it would be generally be north of the I-64 corridor. For the southeast upslope counties where the colder air normally gets trapped, confidence is high enough in freezing rain for Pocahontas and eastern Randolph counties, so have issued a Winter Weather Advisory there. This situation will need to be monitored closely as additional counties could be added tonight. Another concern is with flooding. While many models are not as excited as the last event and convection should be more limited, the 12Z HRRR, 12Z meso NAM, and the FV3 models are concerning. The 12Z HRRR shows a 2 inch band over the southern West Virginia coal fields into the southern and central mountains. The FV3 shows 1 to 1.5 inch amounts in the same area. The meso NAM is similar to the FV3 in that area, with a 2.3 inch bullseye over the northern West Virginia mountains. With only one day of recovery and many streams still running about half bankfull, decided to go with a Flood Watch for Saturday into Saturday night. && .SHORT TERM /SATURDAY NIGHT THROUGH MONDAY NIGHT/... As of 151 PM Friday... A cold front will cross the region early Sunday morning, and precipitation should end for most areas by daybreak with dry weather returning for the rest of Sunday. The Flood Watch will expire at 09Z Sunday with any threat of heavy rain diminishing. Temperatures should end up close to normal for early February with highs in the upper 30s to lower 40s. A weak mid-level disturbance may bring isolated rain/snow showers late Sunday night into Monday morning across southwest Virginia and far southern West Virginia. Slight chance PoPs have been added. The rest of Monday should be largely dry with seasonable temperatures. The next significant system will arrive late Monday night. && .LONG TERM /TUESDAY THROUGH FRIDAY/... As of 151 PM Friday... The next significant system arrives Monday night, lasting through Tuesday, with many questions still remaining. Precipitation type is still highly uncertain, as there is still plenty of disagreement between models. The GFS has been hinting at a potential significant accumulating snow event for much of the region, even across the lowlands. However, several other models, including the ECMWF, keep this event as mostly rain across the lowlands with some snow in the mountains. The key in determining precipitation type will be the track of low pressure. A surge of low-level warm air, like the ECMWF shows, would keep the precipitation type as predominately rain across the lower elevations. Even if precipitation does remain as mostly snow across the lower elevations, surface temperatures only look marginally cold at best. This would yield lower snow ratios and some melting on contact with pavement. Again, many questions remain, so stay tuned. This system will exit the area late Tuesday night into Wednesday morning. Models show another potent system approaching from the southwest Thursday, which at this time, looks to be mainly in the form of rain across the lower elevations and a rain/snow mix in the higher elevations. Given our saturated soils from yesterday`s rainfall and some rivers, creeks and streams running higher than normal, we will be watching next week closely to see if there could be additional flooding problems. && .AVIATION /03Z SATURDAY THROUGH WEDNESDAY/... As of 620 PM Friday... VFR conditions expected until the overnight hours when mainly rain enters the area from west to east affecting the western sites first. There should be minor VIS restrictions down to MVFR and CIGs will eventually go down to MVFR with some possible IFR at PKB. For the eastern sites, restrictions to VIS will be slightly lower due to heavier rain and especially at EKN with snow to start off. The rain will persist into tomorrow with MVFR CIGs dominating. Winds will rotate out of the northeast to the southeast by tomorrow afternoon. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 00Z SUNDAY... FORECAST CONFIDENCE: High. ALTERNATE SCENARIOS: Timing and intensity of restrictions late tonight and Saturday could vary. Freezing rain or snow is possible at the onset of precipitation, mainly over southeast Ohio and northern West Virginia. EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY OF WFO FORECAST TO AVAILABLE MODEL INFORMATION: H = HIGH: TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL. M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS. L = LOW: TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL. DATE SAT UTC 1HRLY 00 01 02 03 04 05 06 07 08 09 10 11 EST 1HRLY 19 20 21 22 23 00 01 02 03 04 05 06 CRW CONSISTENCY H H H H H H H H H H M M HTS CONSISTENCY H H H H H H H H H M M H BKW CONSISTENCY H H H H H H H H H M M H EKN CONSISTENCY H H H H H H H H H H H H PKB CONSISTENCY H H H H H H H H H H H H CKB CONSISTENCY H H H H H H H H H H H H AFTER 00Z SUNDAY... IFR conditions possible Saturday evening into early next week with intermittent precipitation. && .RLX WATCHES/WARNINGS/ADVISORIES... WV...Flood Watch from 3 AM EST Saturday through late Saturday night for WVZ005-006-013>016-018-024>030-033-034-039-040- 515>526. Winter Weather Advisory from 3 AM to 4 PM EST Saturday for WVZ523-524-526. OH...None. KY...Flood Watch from 3 AM EST Saturday through late Saturday night for KYZ105. VA...Flood Watch from 3 AM EST Saturday through late Saturday night for VAZ003-004. && $$ SYNOPSIS...RPY/JMC NEAR TERM...RPY/JZ SHORT TERM...JMC LONG TERM...JMC AVIATION...JZ