Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 230927

Area Forecast Discussion
National Weather Service Missoula MT
327 AM MDT Fri Jun 23 2017

.DISCUSSION...High pressure will continue to strengthen along the
west coast, placing western Montana and central Idaho under dry
and warm northwesterly flow aloft into this weekend. Most
locations will see abundant sunshine and temperatures will warm
to well above normal for this time of year by Sunday. For
locations near the Continental Divide, a weak disturbance today
into Saturday may lead to periods of cloud and even a few showers,
mainly in the vicinity of Glacier National Park.

While Monday will be the warmest day with highs in the 90s for
many valleys, changes will be underway as high pressure breaks
down allowing a southwest flow to set up. By late Monday
afternoon, daytime heating and an approaching disturbance will act
on increasing mid level moisture to bring scattered showers and
thunderstorms. As is common with this type of summer pattern
change, a few strong thunderstorms containing gusty winds will be
possible. Thunderstorm chances will continue Monday night into

Beyond Tuesday, confidence is lower as forecast models struggle to
resolve how an upper level system dropping southward out of
British Columbia will impact the Northern Rockies. At the very
least, expect a few showers and thunderstorms with temperatures
trending downward from the early week peak.


.AVIATION...Generally benign conditions are expected over the next
24 hours as dry northwest flow aloft sets up over western Montana
and central Idaho. Most locations will see abundant sunshine,
though a passing disturbance will likely lead to some mid level
cloud and even a few showers along the Continental Divide,
especially in the vicinity of Glacier National Park. Winds today
will be lighter than those experienced Thursday, though northerly
afternoon breezes are still anticipated, with gusts up to 20 kts



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