Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 191024

Area Forecast Discussion
National Weather Service Boise ID
324 AM MST Thu Jan 19 2017

.SHORT TERM...Today through Friday...Winter storm which brought
significant snow to portions of SE Oregon and SW Idaho, along with
areas of freezing rain and sleet, will wind down today. Another
round of precipitation moved into the region this morning, with
reports of snow and rain, although there may be pockets of
freezing rain and/or sleet.

A portion of the Treasure Valley from Caldwell to Mountain Home
warmed to above freezing and thus any additional precipitation
will be rain, possibly mixed with snow at times, today. Little to
no additional snow accumulations are expected in this area. The
inversion remains locked in the Lower Treasure Valley around
Ontario where additional light snow accumulations will occur
before tapering off later this morning. The Western Magic Valley
will likely see an additional 1-3 inches before tapering off this
afternoon. The remainder of the warning and advisory areas will
likely see another 1-3 inches as well before ending by late
morning or early afternoon.

The upper trough will move through tonight accompanied by a chance
of snow showers mainly over the higher terrain. The next Pacific
trough will spread snow into SE Oregon on Friday. There may be
enough snow accumulations to justify a Winter Weather Advisory for
Harney County and possibly Malheur County. Winds will increase
ahead of the trough, becoming generally Southeast 10 to 20 mph,
with gusts to 30 mph east of Boise.

.LONG TERM...Friday night through Wednesday...GFS and ECM in very
good agreement through Wednesday.  Next Pacific storm comes in
Friday night and Saturday with several inches more snow throughout
the region.  Brief clearing Saturday night ahead of another
strong Pacific frontal system with valley rain/snow and mountain
snow Sunday, followed by more snow showers Sunday night through
Monday night as the Pacific upper low also comes in.  Clearing
and colder Tuesday and Wednesday under dry northerly flow aloft
behind the departing upper low. After that a pattern with models
showing a strong upper ridge along the coast with drying and
warming for our area.


.AVIATION...MVFR/IFR and isolated LIFR in heavier showers.
Mountains obscured.  Areas of snow, freezing rain, sleet, and
rain gradually decreasing from west to east this afternoon and
tonight.  Surface winds generally southeast 5 to 15 kts.
Northeast winds 15 to 25 kts near KJER, decreasing to 10 kts by
18Z.  Winds aloft at 10 kft MSL, southwesterly around 25 kts.


ID...Winter Storm Warning until 5 PM MST this afternoon IDZ016.
     Winter Weather Advisory until 5 PM MST this afternoon
     Winter Storm Warning until 11 AM MST this morning IDZ011-012-033.
     Winter Weather Advisory until 11 AM MST this morning
OR...Winter Storm Warning until 11 AM MST /10 AM PST/ this morning
     Winter Weather Advisory until 4 AM PST early this morning ORZ061.



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