Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 042040

Area Forecast Discussion
National Weather Service Missoula MT
240 PM MDT Tue Aug 4 2020

.DISCUSSION... A broad ridge of high pressure stays planted over
the western U.S. this afternoon, keeping skies clear and
temperatures seasonable. The ridge will remain over the Northern
Rockies through Wednesday. Afternoon high temperatures will creep
back up to the 90s for most valley locations. On Wednesday night,
the ridge shifts to east, resulting in southwest flow aloft. Pacific
moisture and a shortwave disturbance embedded in the southwesterly
flow will bring a chance of thunderstorms to northwest Montana
and north central Idaho.

An upper level trough of low pressure travels along the Canadian
border on Thursday, bringing precipitation and a cold front with
it. Expect widespread precipitation, along with gusty winds and
thunderstorms, on Thursday afternoon and evening. Temperatures
behind the front will return to seasonable, or even slightly
below, on Friday as winds stay elevated through the day. Flow
will shift westerly on Friday night and stay that way into early
next week, keeping temperatures seasonable.


.AVIATION... Clear skies and calm winds will dominate the
forecast today through Wednesday afternoon. The next chance for
impactful weather will be Wednesday night with a chance for
nocturnal thunderstorms across the Norther Rockies airspace.



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