Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 232048

Area Forecast Discussion
National Weather Service Boise ID
248 PM MDT Fri Mar 23 2018

.SHORT TERM...Tonight through Sunday...Showers noted this
afternoon, with some activity observed across the Treasure
Valley. Satellite looking slightly more active than initially
expected, so made quick updates for shower coverage for this
afternoon. A few showers may be possible into the evening hours,
though impacts should be minor. Otherwise, we continue to watch
the low pressure system advance southward as anticipated. Shower
coverage will increase across the area Saturday morning as the
system moves along the Washington/Oregon coast. The system will
become an open wave by Saturday evening, with its axis swinging
across the Pacific Northwest through Sunday. Unsettled conditions
will continue, with temperatures and snow levels dropping enough
to result in possible valley snow for Sunday. Temperatures
generally expected to be 10 to 15 degrees below normal under the
influence of this system. Gusty wind will also be possible, though
most favorable across southeastern Oregon and the Southwest
Highlands of Idaho.

.LONG TERM...Sunday night through Wednesday...Upper level trough
will move east on Monday, with lingering snow showers across the
central Idaho mountains. Moist northwest flow will develop behind
the front, keeping things mostly cloudy, with snow showers over
the mountains of central Idaho through Wednesday. Temperatures
will warm to near normal values.

Wednesday evening through Saturday morning...Sunny skies for most
locations with the exception of the northeastern one-third of the
CWA where partly to mostly cloudy are initially expected. Also,
expect better chances for brief snowfall in the mountains at those
locations. Models in agreement with the medium amplitude ridge in
control to gradually flatten by Wednesday changing the upper wind
flow pattern from northwest to more westerly slowing down any
significant warming or cooling. With low temperatures remaining
around normal, high temperatures will take the high road and weigh
in around 5 to 8 degrees above normal.


.AVIATION...Mainly VFR with scattered light showers/virga this
afternoon mainly north of a line from KREO-KSUN. Snow showers
developing west of BNO-BKE and east of JER-TWF after 06z/Sat.
Surface winds S-SW 10-20kt this afternoon, except S-SE in the
Treasure and Baker Valley, subsiding after sunset. Winds aloft at
10k ft MSL: southwest 25-35kt.

Weekend Outlook...Generally VFR, but MVFR-IFR snow showers are
possible each day as an upper level trough moves through the area,
especially over the higher terrain. Mountains will be obscured.
Surface winds: generally westerly 5-15kt during the day. Winds aloft
at 10k ft MSL: southwest 25-35kt Sat becoming northwest 10-20kt on





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