textproduct: Missoula
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
DISCUSSION
KEY MESSAGES:
- Cold front tonight into Monday bringing cooler, showery and breezy conditions
- Closed low impacting the region late Wednesday into Friday.
Moisture associated with the next disturbance is currently making its way into the Pacific Northwest this morning. This moisture feed will push into north central Idaho and northwest Montana by this afternoon bringing increase cloud cover and light precipitation. Snow level will be steadily decreasing this evening causing accumulating snow at Marias pass. Then during the overnight hours into Monday morning a cold front pushes across the region moving a band of precipitation through the Northern Rockies. At this moment, Marias pass is anticipated to receive enough snow to have a moderate impact to the roadway. Lookout pass will have to be monitored for the potential of impactful snow by Monday morning.
This afternoon southwest Montana and Lemhi county will continue to deal with warm and dry conditions along with the development of breezy westerly winds. The combination of wind and low humidity will create near critical fire weather conditions this afternoon.
After the cold front passage by Monday, the upper level flow will will remain westerly (zonal) over the region through at Wednesday. The models are showing that a warming trend back to seasonal average temperatures by Wednesday, but afternoon humidity readings will become quite low once again.
The models continue to show a closed low moving through the Pacific Northwest into the Northern Rockies late Wednesday through Friday. This low pressure system will bring widespread steady precipitation and cooler temperatures. Snow levels will be hovering around 3000-5000 feet during the bulk of precipitation period. The mountains and higher valley locations are expected to have decent accumulating snow by Friday morning.
AVIATION
Moisture will begin to stream into the Northern Rockies later today causing increased and lowering cloud cover. Precipitation will start to impact portions of North central Idaho and northwest Montana during the afternoon hours. Also gusty southwesterly winds are expected to develop for KSMN and KBTM this afternoon.
MSO WATCHES/WARNINGS/ADVISORIES
MT...Winter Weather Advisory from 8 PM this evening to 10 AM MDT Monday for West Glacier Region.
ID...None.
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