Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 171028

Area Forecast Discussion
National Weather Service Boise ID
328 AM MST Tue Jan 17 2017

.SHORT TERM...Today through Wednesday...
Incoming Pacific storm will bring significant amounts of snow,
freezing rain, and rain to our CWA late tonight through and
beyond Wednesday. Temperature and snow levels will rise
dramatically during the storm especially Wednesday afternoon,
but cold air will remain in wind-sheltered valleys resulting in
freezing rain there. Current winter storm watch will shortly be
converted to winter storm warnings for heavy snow, or winter
weather advisories for mixed precipitation with smaller
accumulations of snow but also some accumulation of ice.

.LONG TERM...Wednesday night through Monday...A very moist Southwest
flow aloft ahead of an approaching upper trough will bring
significant precipitation to SE Oregon and SW Idaho Wednesday night
through Thursday. There should be enough wind to scour out the
inversion with snow levels rising above valley floors for portions
of the Treasure Valley, where a mix of rain and snow is expected.
The cold air may have a tougher time mixing out of the Lower
Treasure Valley around Ontario which could lead to higher snowfall
totals. The heaviest amounts will be in the higher elevations of
Baker County and the Boise/West Central Mountains. There will also
be freezing rain in some valley locations. The upper trough will
move through late Thursday sending snow levels back down to valley
floors, although the precip will taper off by then. Additional
(weaker) Pacific systems will move through the region for the
remainder of the extended period. Temperatures will be cold enough
for snow at all elevations.


.AVIATION...Areas of MVFR and IFR conditions in valley fog and
stratus with conditions improving to VFR after 18Z. Surface winds:
Mainly East-Southeast 5-15 kts. Winds aloft near 10kft MSL: Westerly
10-20 kts.


ID...Winter Storm Watch from this evening through Thursday afternoon
OR...Winter Storm Watch from this evening through Thursday afternoon



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