Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 252055

Area Forecast Discussion
National Weather Service Boise ID
255 PM MDT Tue Apr 25 2017

.SHORT TERM...Tonight through Thursday...Pacific moisture
associated with a cold front ahead just reached the Oregon coast
at 20z. Showers have developed head of the front which will move
into Southeast Oregon early this evening and Southwest Idaho early
Wednesday morning. The main push of precipitation will come post
frontal passage late Wednesday morning when the upper level low
dynamics moves over the region. The heaviest precipitation will
fall across Southeast Oregon Wednesday morning and south of the
Western Snake River Plain Wedesday afternoon. In general, the
valleys will see about three tenths of inch of rain with the
mountains below 6000 feet seeing closer to three quarters of inch
of rain on Wednesday. Cold northwesterly flow develops on Thurday
for continued showers and breezy conditions. Temperatures fall to
around 15 degrees below normal on Thursday.

.LONG TERM...Thursday night through Tuesday...Pattern changes little
through early next week as a longwave upper ridge remains off the
west coast and a northwest flow aloft prevails over our area. A
departing trough will continue to support showers on Friday,
followed by a weak ridge and drier weather on Saturday. Moisture
residing within the northwest flow aloft will bring a chance of
showers Sunday through Tuesday, favoring the northern mountains.
Temperatures will be 5-10 degrees below normal.


.AVIATION...Widespread VFR. Scattered MVFR showers will continue in
the West Central and Boise Mountains until around 02Z. Another round
of showers will spread into SE Oregon after 00Z, and SW Idaho after
04Z. Snow levels will be around 6,000 ft MSL. Surface winds: west-
northwest 5-15 kts, except 15-25 kts from a KMUO to KJER/KTWF
corridor. Winds becoming variable 10 kts or less after 03Z. Winds
aloft near 10k ft MSL: west 15-30 kts.





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