textproduct: Missoula

DISCUSSION

KEY MESSAGES:

- Strong valley inversions will persist for several more days.

A weak disturbance is currently drop southward out of Canada today. This feature will not be strong enough to fully disrupt the valley inversions that have been prevalent for the past several days. This disturbance could cause the low stratus deck over north central Idaho and northwest Montana to produce flurries and/or freezing drizzle. Any areas that receive this light precipitation during the early morning hours should anticipate icy conditions.

A few more of these weak disturbance are anticipated to drop through the Northern Rockies over the next week. These feature will push in cooler air from the north and east causing temperatures to drop below seasonal averages by Friday. Unfortunately these disturbance will be extremely limit on their moisture feed so snow will be very limited.

AVIATION

Low stratus and fog will remain entrenched in the valleys of north central Idaho and north west Montana. A weak disturbance passing through the region will bring higher level clouds to the region, but it should not be strong enough to break up the valley inversions. KGPI will continue to deal with a low stratus deck throughout the day. The disturbance is expected to limit the stratus deck of KMSO.

MSO WATCHES/WARNINGS/ADVISORIES

MT...None. ID...Air Stagnation Advisory until 4 PM PST this afternoon for Northern Clearwater Mountains...Orofino/Grangeville Region...Southern Clearwater Mountains.