729
FXUS65 KMSO 271907
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
107 PM MDT MON OCT 27 2025
DISCUSSION
KEY MESSAGES:
- SNOW SHOWERS LINGER THROUGH THIS EVENING, MAINLY IN THE HIGH
TERRAIN, BUT ALSO A FEW IN VALLEYS.
- MODELS ARE UNCERTAIN ABOUT THE DETAILS OF THE NEXT STORM
SYSTEM SET TO ARRIVE FOR THE WEEKEND WITH VALLEY RAIN AND
MOUNTAIN SNOW.
THE MORNING'S UNSETTLED WEATHER, WHICH BROUGHT SNOW TO THE
MOUNTAINS, IS NOW MOVING OUT OF THE REGION. THIS AFTERNOON, WE
ARE SEEING MAINLY MOUNTAIN SHOWERS WHICH WILL LINGER THROUGH THE
EVENING. A FEW VALLEY SHOWERS ARE ALSO POSSIBLE BY LATE EVENING.
THERE WILL BE PERIODS OF CLEARING SKIES AS A RIDGE OF HIGH
PRESSURE BEGINS TO BUILD IN, BUT WIDESPREAD CLEARING SKIES WILL
LIKELY HOLD OFF UNTIL MIDDAY TUESDAY. THIS RIDGE WILL BRIEFLY BE
IN PLACE ON TUESDAY, BRINGING DRY, MOSTLY SUNNY, AND PLEASANT
WEATHER TO THE ENTIRE AREA. THE RIDGE WILL BE NUDGED BY A WEAK,
QUICK- MOVING SYSTEM DIVING SOUTH ON WEDNESDAY. THIS WILL BRING
LIGHT SHOWERS, MOSTLY TO THE MOUNTAINS OF NORTHWEST AND WEST-
CENTRAL MONTANA, BUT IMPACTS ARE EXPECTED TO BE LOW.
OUR ATTENTION THEN TURNS TO THE WEEKEND. MODEL GUIDANCE SHOW THE
NEXT PACIFIC STORM SYSTEM ARRIVING SOMETIME OVER THE WEEKEND. THIS
LOOKS LIKE ANOTHER "ATMOSPHERIC RIVER" EVENT, BUT CURRENT
THINKING IS THAT IT WILL BE WEAKER THAN THE SYSTEMS WE'VE SEEN
RECENTLY. IT WILL LIKELY BRING A RETURN TO VALLEY RAIN AND
MOUNTAIN SNOW, BUT THE EXACT TIMING AND STRENGTH ARE STILL IN
QUESTION
AVIATION
LINGERING SHOWER ACTIVITY IS EXPECTED TO TAPERED OFF LATE THIS
EVENING AS A RIDGE OF HIGH PRESSURE BUILDS OVER THE REGION. MOST
OF THE SHOWERS ARE IN THE MOUNTAINS BUT HIGH-RESOLUTION MODELS
SUGGEST THAT A FEW SHOWERS WILL OCCUR IN THE VALLEYS BY LATE THIS
EVENING. CLOUDS WILL LINGER INTO TUESDAY MORNING, ESPECIALLY OVER
THE TERRAIN AND FROM KMSO NORTH THROUGH NORTHWEST MONTANA.
WIDESPREAD CLEARING SKIES ARE EXPECTED TO PREVAIL BY MIDDAY
TUESDAY.
MSO WATCHES/WARNINGS/ADVISORIES
MT...NONE.
ID...NONE.
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