Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 242023

Area Forecast Discussion
National Weather Service Missoula MT
223 PM MDT Wed May 24 2017

...Windy Conditions Continue through Wednesday Evening...

.DISCUSSION...Widespread reports of valley wind gusts in the 40
mph range have been coming in today across western Montana/Lemhi
County and to 30 mph north central Idaho, and this will likely
continue through the afternoon and evening hours. Isolated gusts
to 50 mph are possible as well, especially near the Continental
Divide in northwest Montana where scattered rain showers will
help bring down strong winds from aloft. Stay extra attentive if
traveling or recreating today, as some roads will likely have
trees branches or other debris blown onto them. Wind Advisories
have been issued and run through this evening, as winds will
decrease and become lighter after sunset tonight.

Morning temperatures Thursday will be cool, but exceptionally
cold temperatures should be avoided as clouds keep lower valleys
of western Montana, Lemhi County and north central Idaho above
freezing. Snow showers are possible early Thursday over Marias
Pass and elevations along the Continental Divide above about 5500
ft. The trough of low pressure over the Northern Rockies keeps
temperatures cool and below normal for Thursday.

A steady warmup is expected Friday through the middle of next
week, with Memorial Weekend looking warm and largely dry. During
this period afternoon showers will likely pop up over the terrain
each day, but valleys stay mostly day. Valleys temperatures will
be in the high 70s into the 80s by Sunday into Monday.

One thing to keep an eye on next week will be river levels for
those that live or recreate along rivers. The warm-up this
weekend will again increase snowmelt in the high terrain and cause
rivers to rise. Two are of particular concern:
1) The Salmon River in Lemhi County and 2) the Flathead River
between Columbia Falls and Flathead Lake. These rivers are the
closest to bankfull; perhaps reaching near flood stage by the end
of the month.


.AVIATION...Gusty winds will continue through sunset today, with
gusts in the 30 and 40 kt range being common for valleys of
western Montana. Isolated erratic gusts to 50 kts are possible
this afternoon and evening under any rain showers, which will
increase in coverage over northwest Montana. For Idaho and
Clearwater county airstrips, lesser gusts in the 20 kt range will
be the norm, so we are not expecting as much impact from winds in
these areas. After sunset, surface winds become less gusty and
lighter as the pressure gradient relaxes. Notable speed shear is
possible as winds stay breezy about 1000 to 2000 feet AGL
overnight, especially for places like KBTM.


MT...Wind Advisory until 9 PM MDT this evening Butte/Blackfoot Region.

     Wind Advisory until 9 PM MDT this evening Bitterroot/Sapphire
     Mountains...Missoula/Bitterroot Valleys...Potomac/Seeley
     Lake Region.

     Wind Advisory until 9 PM MDT this evening Kootenai/Cabinet
     Region...Lower Clark Fork Region.

     Wind Advisory until 9 PM MDT this evening Flathead/Mission
     Valleys...West Glacier Region.

ID...Wind Advisory until 9 PM MDT this evening Eastern Lemhi County.


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