Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 170950

Area Forecast Discussion
National Weather Service Missoula MT
350 AM MDT Wed Aug 17 2022

.DISCUSSION...Strong high pressure will be the dominate weather
pattern through Sunday. Hot temperatures well into the 90s to
around 100 degrees will occur across the Northern Rockies. Heat
advisories are in effect through this weekend in the lower hells
canyon region in west central Idaho for hot temperatures exceeding
105 degrees and very warm overnight temps. The region will also
be under a very dry air mass especially today and Thursday with
Relative Humidities in the afternoon ranging from 10-15%.

Some monsoon moisture will work its way into the Northern Rockies
and bring a 15 to 30 percent probability for thunderstorms
primarily across Lemhi county and southwest Montana Thursday and
Friday. Storms will extend further north into west central Montana
and along the continental divide.

A subtle change to a weaker high pressure ridge resulting in
cooler temperatures is expected early next week. However this
looks to be short lived as long range models along with CPCs 8-14
day outlook are calling for well above normal temps and dry


.AVIATION...A ridge will continue to dominate the weather pattern
in the Northern Rockies. Expect VFR conditions with hot temperatures
creating high density altitudes during the afternoon.


ID...Heat Advisory from noon today to 11 PM PDT Friday Lower Hells
     Canyon/Salmon River Region...Orofino/Grangeville Region.


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