Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 281044

Area Forecast Discussion
National Weather Service Boise ID
344 AM MST Tue Jan 28 2020

.SHORT TERM...Today through Friday...A moist southwest flow aloft
preceding an upper trough and cold front was spreading light
precipitation into the area this morning. Snow levels will be
around 4500 feet with additional snow accumulations expected,
mainly above 5000 feet. A Winter Weather Advisory is in effect for
the West Central Mountains through today. The precip will
transition to showers with the instability associated with the
trough. There will be enough instability to support isolated
thunderstorms late this afternoon through early this evening. The
stronger storms will be capable of producing gusty winds to 40 mph
and small hail or graupel. A brief period of gusty winds may
accompany the front as well, which will move through the region
this afternoon. The showers will decrease late tonight as a drier
northerly flow develops behind the exiting trough. The dry
conditions will prevail through Wednesday morning. Patchy valley
fog may develop with the clearing skies by early Wednesday
morning. Northwest flow aloft will send a weakening upper trough
and bring another round of precipitation late Wednesday through
Thursday, although precipitation amounts will be light. A warm
front will be accompanied by a chance of precipitation across the
north Thursday night through Friday. Temperatures will be around
5 degrees above normal through Wednesday, warming to 10-15 degrees
above normal on Friday.

.LONG TERM...Friday night through Tuesday...The upper level high
begins to flatten out late Saturday into Sunday. This allows for
an upper level trough to drop into the Pacific Northwest.
Widespread precipitation will spread across the region Sunday
night into Monday. Snow levels begin close to 6000 feet MSL then
drop rapidly behind the cold front to valley floors by early
Monday morning. Precipitation at this time has moved into central
Idaho, with much of the West Central and Boise mountains still
expected to see snowfall through late Monday evening. A cooler
northwest flow sets up which will bring temperatures back to
normal for Tuesday.


.AVIATION...Areas of MVFR within rain/snow. Widespread
precipitation for SW Idaho through early afternoon with more
isolated precipitation in SE Oregon. Snow levels sit right around
4700 feet MSL for the day. Valley county will see widespread snow
throughout much of the day creating IFR/LIFR conditions. Surface
winds, southwest to southeast 5-10kts. Winds aloft to 10k feet
MSL, west 30-35kts becoming northwest after 00z.


ID...Winter Weather Advisory until 5 PM MST this afternoon IDZ011.



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