Area Forecast Discussion
Issued by NWS Boise, ID

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000
FXUS65 KBOI 261006
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
306 AM MST Fri Feb 26 2021

.SHORT TERM...Today through Sunday night...Snow will continue to
progress southward from the northern tier of the forecast area
this morning (Baker County to the West Central Mountains) into
the remainder of southeast Oregon and southwest Idaho this
afternoon. Most of the snow will occur in the higher elevations,
especially in the mountains of Baker County and central Idaho
where the snow will be heavy at times. In addition to the snow, an
approaching cold front will enhance the winds which will become
gusty, producing areas of blowing/drifting snow. Some snow is
likely in the valleys, although amounts will be light. The main
concern will be the winds late this morning through this evening
associated with the frontal passage. It will be very windy across
most of southeast Oregon where a Wind Advisory is in effect. A
period of very windy conditions is possible in the
Treasure/Western Magic Valleys as well this afternoon. No updates
will be made to the various winter weather and wind headlines at
this time. Snow showers will continue tonight and then diminish on
Saturday for additional accumulations in the higher elevations
and little to no accumulation in the valleys. Areas of blowing
snow will continue in the higher elevations due to persistent
gusty west-northwest winds, including along the ID/NV border. The
snow and gusty winds will end Saturday evening as an upper ridge
builds into the Pacific Northwest. The ridge will amplify through
Sunday for dry conditions and light winds. Temperatures will be
around 10 degrees below normal each day.

.LONG TERM...Monday through Friday...Models continue to differ on
their solutions for the first part of the extended. GFS and
Canadian both show an approaching trough moving through the Gulf
of Alaska splitting. The southern end forms a closed low off the
Southern California Coast. The northern portion slides into the
Washington Coast, potentially bringing a threat of precipitation
to the far north portion of the forecast area. The ECM, on the
other hand, continues to try and hold the trough together as it
slides through the area. Appears that the trend of the NBM wants
to follow the ECM and at this time looks reasonable. Therefore, a
threat of light precipitation is possible across most locations
Monday. The remainder of the extended period remains dry with
temperatures at or slightly above normal temperatures. This as an
upper ridge takes residence over the Pacific Northwest.

&&

.AVIATION...MVFR/IFR conditions will spread through the region
through Friday. Heavy snow will continue in the West Central
Mountains for mountain obscuration and IFR conditions. Scattered
MVFR snow showers will continue elsewhere mainly after 26/10Z.
Surface winds: Variable less than 10 kts KONO through KBOI along
with vcnty KBKE/KMYL. Otherwise west 10 to 15 kts with gusts to 25
kts through 26/12z. Winds increase from the west to northwest 15
to 25 kt with gusts up to 40 kt aft 26/15z as front slides through
the region. This could bring a brief period of LLWS to mainly
Eastern Oregon around sunrise. Winds aloft at 10k feet MSL,
northwest 30 to 45 kts, increasing to 45 to 65 kts by 26/15z.

Weekend Outlook...Widespread snow Friday night, decreasing to
scattered snow showers Saturday afternoon, ending Saturday night.
VFR Sunday. West to northwest surface winds 10-20 kts Saturday
afternoon.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Winter Storm Warning until 5 AM MST Saturday IDZ011-013.
     Winter Weather Advisory from 11 AM this morning to 5 PM MST
     Saturday IDZ015-029-030.
     Winter Storm Warning from 5 AM early this morning to 5 AM MST
     Saturday IDZ033.
     Winter Weather Advisory until 5 AM MST Saturday IDZ028.
OR...Wind Advisory from 11 AM MST /10 AM PST/ this morning to 8 PM
     MST /7 PM PST/ this evening ORZ061-063.
     Winter Storm Warning from 4 AM early this morning to 4 AM PST
     Saturday ORZ062.

&&

$$

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SHORT TERM...BW
LONG TERM....CR
AVIATION.....CR



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