Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 242052
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
252 PM MDT Mon Apr 24 2017

.SHORT TERM...Tonight through Wednesday...Upper level trough is
centered near Portland, OR and is moving southeast this
afternoon. Numerous showers and a slight chance of thunderstorms
will continue through this afternoon. Storm total precipitation
amounts of 0.75 to 1.25 in of water equivalent is expected through
Tuesday morning in the mountains with snow levels near 6000 ft,
lowering to 4500 ft Tuesday morning. Lesser precipitation amounts
of 0.15 to 0.50 in for the valleys. The center of the shortwave
is expected to track across SE Oregon tonight into northern Nevada
by Tuesday morning. Wrap around moisture will keep precipitation
going across the Idaho zones through Tuesday morning and in the
Boise mountains through midday Tuesday as the system pushes
southeast. Drier air will move into the region for Tuesday with
slightly warmer temperatures. A potent system arrives on
Wednesday, with an impressive fetch of moisture. Expect
precipitation to become widespread, much like today across SE
Oregon and SW Idaho on Wednesday afternoon. Precipitation amounts
of upwards of an inch in the mountains and a half inch in the
valleys, and possibly more, is expected with this system. Snow
levels range from 5500 ft in the central ID mountains to near
7500 ft near the NV border.

.LONG TERM...Wednesday night through Monday...Wednesday`s storm
moves off to the east Wednesday night followed by colder but still
moist northwesterly flow aloft Thursday. Thursday and Friday look
abnormally cold with an upper low over the northern Rockies that
will dig south into Utah and Colorado by Friday. 850-700 mb
thickness gets low enough to support wet snow or mixed rain and
snow down to the lowest valleys both Thursday and Friday mornings,
with Thursday the colder day by a slight margin. However, qpf
will be slight and no snow accumulation is expected. Warming and
drying later Friday through Monday with temps rising to almost
normal by Monday as a short wave ridge aloft comes in from the
northwest.

&&

.AVIATION...Generally MVFR ceilings with areas of MVFR visibility
in clouds and pcpn. Mountains generally obscured. Isolated
thunderstorms until 25/00Z. Showers decreasing and conditions
improving to VFR in eastern Oregon after 25/08Z and in western
Idaho after 25/12Z. Mountains remaining locally obscured in
residual rain and snow showers. Snow level lowering from 6000 ft
MSL to 4500 ft MSL after 25/03Z. Surface winds: west/northwest
15-25 kts. Gusts to 35 kts near thunderstorms. Winds aloft near 10
KFT MSL: west 25 kts becoming northwest 15 to 20 kts after 25/03Z

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

$$

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SHORT TERM...KA
LONG TERM....LC
AVIATION.....LC



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