Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 190231

Area Forecast Discussion
National Weather Service Boise ID
831 PM MDT Sun Mar 18 2018

.DISCUSSION...Upper low has moved east.  Showers have ended and
clouds were decreasing. Weak ridging aloft Monday will warm temps
a little from today.  Next upper trough will bring a chance of
showers Tuesday but more likely Tuesday night into Wednesday.
A deep trough off the coast Wednesday will bring warmer southerly
dlow into our area.  Significant cold front will come in late
Thursday with showers and gusty winds, followed by colder temps.
No updates at this time.


.AVIATION...Isolated MVFR/IFR showers overnight across the
mountains, with chances increasing after 19/18Z. Otherwise, low VFR.
Fog possible in sheltered mountain valleys. Snow levels between 2500-
3500 ft with mountains obscured. Surface winds: variable, generally
10 kts or less. Winds aloft near 10 KFT MSL: WSW 10-15 kts.


SHORT TERM...Tonight through Wednesday...A brief break in the
precipitation tonight as the current storm exits eastward. A
couple of weak upper waves return a chance of showers to the east-
central Oregon and west-central Idaho mountains Monday and Tuesday.
Areas of far southeast Oregon and the Snake Plain to the ID/NV
border are likely to remain dry but mostly cloudy through
Tuesday. Precipitation becomes more widespread Tuesday night into
Wednesday as moist southwest flow increases ahead of an
approaching low. The influx of mild air ahead of the low will
raise snow levels to 5-6k feet by Wednesday afternoon.
Temperatures are within a few degrees of normal through Wednesday.

LONG TERM...Wednesday night through Sunday...Another upper low
off the PACNW coast will bring widespread precip on Thursday
with a cold front passage. Snow levels are expected to be
6000-7000 ft on Thursday then dropping to 2000-3000 ft by Friday.
There is still a chance of rain and snow continuing through the
weekend, but models track this low quite differently, which will
make all the difference. Otherwise, temperatures on Thursday will
be above normal under a strong southerly flow, then below normal
Friday and beyond.





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