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FXUS65 KMSO 201053
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
353 AM MST TUE JAN 20 2026
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.
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