Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 252024

Area Forecast Discussion
National Weather Service Boise ID
224 PM MDT Sat Mar 25 2017

.SHORT TERM...Weak upper trough will maintain a few light showers
and flurries in northern mountains this evening.  Otherwise partly
cloudy and cool tonight as the trough moves eastward.  Next Pacific
frontal system will reach the coast late tonight.  System`s warm
front will bring light rain and mountain snow Sunday afternoon, snow
level 5500 to 6000 feet MSL.  After a short break, cold front will
bring widespread rain and snow late Sunday night and Monday. Snow
level will lower to 5000 to 5500 feet MSL Monday morning.  Fropa
early Monday morning is at an unfavorable time for thunderstorms but
heavy showers are possible.  No significant changes to river levels
are expected as a result of precipitation.  Post-frontal west or
northwest winds will increase to 20 to 30 mph Monday. Gusts to 40
mph Monday afternoon in the Upper Treasure Valley, western Magic
Valley, and Owyhee and Twin Falls Counties.

.LONG TERM...Monday night through Saturday...Models agree that
shortwave ridge will build in Tuesday and Wednesday. After a cool
morning Tuesday morning, will then see slightly above normal
temperatures the rest of Tuesday and Wednesday. Next trough comes
through Thursday. GFS is a little slower and less aggressive than
the ECMWF, but either way Thursday into early Friday likely to be
cool and wet across the whole area.  A drying trend continues to be
on track later Friday as an upper ridge builds in from the Pacific
although timing of the exiting system is a little uncertain.
Temperatures will be near to slightly above normal through next


.AVIATION...Isolated weak showers with local wind gusts to 25
kts through about 02Z, then clearing. High clouds approach and
thicken from the west overnight. MVFR showers will spread into
Oregon during the morning on Sunday, and then into Idaho in the
afternoon. Heavier showers Sunday night and Monday. Surface winds
south to east 10-15 kts. Winds aloft southwest increasing to 25-30
kts at 10k feet by Sunday afternoon.





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