Wind Advisory 2, NWS Boise, ID

252 
WWUS75 KBOI 260247
NPWBOI

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
747 PM MST Mon Feb 25 2019

IDZ015-029-ORZ061-063-260400-
/O.EXP.KBOI.WI.Y.0002.000000T0000Z-190226T0300Z/
Southwest Highlands-Owyhee Mountains-Harney County-Malheur County-
747 PM MST Mon Feb 25 2019 /647 PM PST Mon Feb 25 2019/

...WIND ADVISORY WILL EXPIRE AT 8 PM MST /7 PM PST/ THIS
EVENING...

Winds will continue to subside this evening.

$$

Area Forecast Discussion
National Weather Service Boise ID
241 AM MST Mon Feb 25 2019

.SHORT TERM...Today through Wednesday...A large upper level trough
extends southwest from near Seattle into the Pacific Ocean this
morning, and a lead shortwave is approaching the northern CA
coast. Our upper level flow will back (change from westerly to
southwesterly) through the day, allowing warmer air to move into
the region. Models are consistent with each other, and with yday's
runs, in showing a cold front moving through early Tuesday,
followed by a return of the warm air Wed. All through this period,
moisture will continue to hit the mountains, although there will
be a relative lull Tuesday. Snow levels will come down enough,
briefly, to return snow to the lower elevations Tuesday morning
and possibly into the afternoon, but accumulations will be less
than an inch, and with warm roads after 48 hours of above-freezing
temperatures, there may be no appreciable accumulation on roads
at all. Therefore, no advisories are anticipated in places like
the Treasure and Magic Valleys. Snowfall will continue to pile up
in the higher elevations through tonight, and to a lesser degree,
on Tuesday. Additional accumulations today through Wed will range
from 12 to 30 inches above 5000 feet. Therefore, the winter storm
warnings will be allowed to continue, and may even need to be
extended further in time. Winds will continue to be strong enough
to create blowing/drifting snow through Tue. With the rapid
succession of fronts moving through, temps will be tricky the next
few days. We believe the warmer MAV numbers are too high, while
the colder MET numbers are too low, and have generally gone near
the EC MOS for the early periods of the forecast.

.LONG TERM...Wednesday night through Sunday...There is good model
agreement showing the upper low that has been off the coast the
last several days pushing a cold front through the region Thursday
afternoon. Plenty of moisture streams into the region ahead of
the frontal passage as well...so accumulating snow continues in
the mountains. Snow levels expected to be 3500-4500 feet across
the northern region and above 5000 feet generally south of a Burns
to Boise line Thursday morning, then lowering to near the valley
floors by late afternoon. A drying trend is expected Friday before
another upper low from just north of Hawaii lifts towards the
coast and begin pushing precipitation back into the region
Saturday afternoon. How far north that precipitation lifts in
still in question as the ECM limits the precip to the NV border
area only and the GFS takes it as far north as a Burns to Boise
line.

&&

.AVIATION...Low elevation rain and mountain snow continue to
bring periods of IFR/MVFR conditions to the region with snow
levels generally above 4000 feet this afternoon. Snow levels are
expected to lower to the valley floors after midnight bringing
widespread MVFR/IFR conditions to most locations. Surface winds
Southeast to southwest 5 to 15 kts becoming 10 to 20 kts aft
25/18z. Wind shifting northwest by 26/09z near KBNO/KBKE. Wind
near 10KFT southwest 25 to 50 kts, except near 60 kts across
eastern Oregon. Wind decreasing after 26/09z.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Winter Storm Warning until 5 PM MST Tuesday IDZ011-013-028.
OR...None.

&&

www.weather.gov/Boise
www.facebook.com/NWSBoise
www.twitter.com/NWSBoise

SHORT TERM...SP
LONG TERM....CR
AVIATION.....CR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
801 AM MST MON FEB 25 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0745 AM     HEAVY SNOW       1 S FEATHERVILLE        43.59N 115.26W
02/25/2019  M46.5 INCH       ELMORE             ID   TRAINED SPOTTER

            46.5 INCHES OF NEW SNOW SINCE 510 PM MST 2/22.

&&

DDECKER