Forecast Discussions mentioning any of
"HRRR" "RAP" "RUC13" "RUC" "RR" received at GSD on 03/15/18
Area Forecast Discussion
National Weather Service Spokane WA
735 PM PDT Wed Mar 14 2018
.SYNOPSIS...
More typical spring like weather is expected with showers
continuing at times through the weekend. Temperatures will be near
average for this time of the year.
&&
.DISCUSSION...
Update: Isolated showers continue to develop this evening over the
Columbia Basin as a weak mid level wave moves up from the south.
The air mass in this area is relatively dry with dew points in the
lower 30s so any measurable rain from these showers will be
isolated in nature. These showers are tracking into the Spokane
area with an update to extend the chance of showers through the
remainder of the evening and to expand this threat westward into
the Coulee City and Ephrata areas. Elsewhere showers are winding
down with the loss of daytime heating. The mid level wave is weak
and thus would not expect showers over the basin to linger into
the overnight hours and the HRRR is in agreement with this.
The rest of the forecast details remain on track. Another wave
over southern Idaho will track north into Thursday morning
clipping SE Washington and the Central Panhandle Mountains giving
these areas an increasing threat for light showers with snow
levels lowering to 2500-3000 feet. Lastly, seeing some clearing on
satellite this evening over portions of the northern valleys
especially southern Ferry and Stevens counties. This in
combination with a moist boundary layer will lead to increasing
fog and stratus tonight. JW
&&
.AVIATION...
00Z TAFs: The band of rain has exited the area but daytime heating
will result in continued isolated/scattered showers over SE WA,
Spokane area into the Idaho Panhandle through the evening. Concerning
fog/stratus potential tonight...much drier air in the boundary
layer over Central Washington should result in continued VFR
conditions at KEAT/KMWH. This drier air will have a hard time
making much progress east due to relative light pressure
gradients. This will likely lead to an expansion of stratus with
patchy fog over Eastern WA/N Idaho overnight and lingering into
Thursday morning. MVFR CIGS will be common with IFR/LIFR
conditions possible. JW
&&
.PRELIMINARY POINT TEMPS/POPS...
Spokane 35 47 31 50 32 48 / 30 10 0 10 10 30
Coeur d`Alene 35 44 28 47 29 45 / 30 20 0 10 10 40
Pullman 34 45 31 49 33 45 / 30 50 0 10 30 40
Lewiston 39 51 35 54 36 52 / 20 50 10 20 20 30
Colville 35 47 29 51 31 51 / 30 20 20 10 10 20
Sandpoint 34 41 30 47 31 45 / 30 20 20 10 20 40
Kellogg 34 41 28 46 30 44 / 40 30 10 10 20 40
Moses Lake 35 53 31 56 32 55 / 20 0 0 10 10 10
Wenatchee 35 51 32 52 33 52 / 0 0 0 10 10 20
Omak 35 48 31 51 31 51 / 0 0 0 10 10 20
&&
.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...None.
&&
$$