Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 262050
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
250 PM MDT Sun Mar 26 2017

.SHORT TERM...Warm front with light rain on the Idaho side
this evening.  Rain and mountain snow in all areas again late
tonight and Monday morning as Pacific cold front moves through.
Showers continuing Monday under upper trough.  Air mass
destabilizing Monday with a slight chance of thunderstorms on
the Idaho side Monday afternoon.  Post-frontal west/northwest
winds will increase to near advisory speeds in the Upper Treasure
Valley and Western Magic Valley Monday afternoon.  Clearing west
to east in all areas Monday night, and colder under northerly
flow aloft.  Tuesday morning will average 10 degrees colder
than Monday morning.  Upper ridge Tuesday will bring mostly
sunny skies and rapid warming in the afternoon.  Minor
flooding to continue on the Snake River near Weiser and on the
Boise River at Glenwood bridge.  Colder air Monday night should
decrease snowmelt.

.LONG TERM...Tuesday night through Sunday...
Unsettled weather through the extended period as an active pattern
continues through most of the upcoming week. A brief upper ridge
will be over the region early Wednesday before another strong
trough moves into the Pacific Northwest in the afternoon. Precip
water values soar into the 90-95th percentile...so should see a
potent rain/snow event across the region with snow levels 5500-6500
feet in the north to over 7000 feet along the NV border area. Precip
values over the higher terrain generally 0.75-1.00 inches and above
for Wed/Thur time period. The upper low dives southward across the
Great Basin into Friday morning which should bring brisk northwest
winds across all zones. Another brief upper ridge expected by the
weekend bringing a drying trend to the region...but models for next
weekend are showing some disagreement with the timing of troughs
potentially pushing through the upper ridge.

&&

.AVIATION...Generally widespread VFR conditions expected...except
pockets of IFR/MVFR and mtn obscuration in low clouds and precip
within the trough moving overhead this afternoon and early evening.
Another round of IFR/MVFR conditions overnight as the main front
pushes through the area. Surface winds Southeast to South 10-20 kts
with locally higher gusts ahead of the front...a brief shift to the
southwest as this first band pushes through. Winds shift to West or
Northwest after 27/0900z. Winds at 10kft southwest 10-20 kts
shifting to west-northwest after 27/12z.

&&

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

&&

$$

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aSHORT TERM...LC
LONG TERM.....CR/DD
AVIATION......CR



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