Area Forecast Discussion
Issued by NWS Boise, ID
FXUS65 KBOI 011623
Area Forecast Discussion
National Weather Service Boise ID
923 AM MST Wed Mar 1 2017
.DISCUSSION...A few light snow showers continuing in northern
mountains today, ending tonight. Elsewhere, partly cloudy with
gradual warming through Friday as low-amplitude upper ridge
comes in from the Pacific. Weak Pacific upper trough will cut
down the ridge Friday night. Associated surface cold front
will bring light rain and mountain snow showers. Stronger
Pacific trough and cold front Saturday night with widespread
pcpn, snow level lowering to valley floors by Sunday evening.
Latest models indicate a long-duration snowfall in northern
mountains Sunday through Tuesday under moist northwesterly
flow aloft. Current forecast is on track through at least
.AVIATION...Generally VFR. Sct-Bkn mid level ceilings.
Periods of MVFR ceilings with mountain obscuration over central
ID mountains. Winds aloft at 10kft MSL: NW 10-20kt. Surface
winds variable 10kt or less.
SHORT TERM...Today through Thursday...Radar continues to indicate
the presence of very weak shower activity across the area, though
this activity continues to diminish. Northwesterly flow expected
to continue today under the influence of an off-coast ridge.
Moisture embedded in the flow will keep the ridge dirty, with a
few showers possible through Thursday morning, mainly across the
west-central mountains of Idaho, the Boise mountains, and perhaps
into Baker county of Oregon. Drier and warmer conditions then
expected across the area Thursday afternoon.
LONG TERM...Thursday night through Tuesday...Moisture flowing
inland ahead of an upper level trough will spread scattered showers
into Baker County Oregon and the west central Idaho mountains
Thursday night and Friday morning. Precipitation will reach the
Boise Mountains and lower Treasure Valley Friday afternoon, then
spread south across the remainder of our area Friday night, becoming
widespread over the higher terrain of central Idaho and Baker County
Oregon. Snow levels will be near 5000 feet, then lower to around
4000 feet by Sunday morning as the trough moves inland. Snow showers
will continue over the higher terrain Sunday night and Monday, with
a mix of rain and snow in the valleys. Snow could briefly accumulate
in the lower valleys late Sunday night and Monday morning, but will
melt by afternoon as temperatures rise into the 40s. Scattered
showers will continue Monday night and Tuesday, with gradual warming
as the upper level flow shifts into the west and southwest.
PREV SHORT TERM...KB
PREV LONG TERM....JT