603
FXUS65 KMSO 291833
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
1233 PM MDT SAT MAR 29 2025
DISCUSSION
KEY MESSAGES:
- A YELLOWSTONE LOW MOVING SOUTH OF THE REGION WILL CAUSE SOME
SNOW ACCUMULATION IN SOUTHWEST MONTANA TONIGHT.
- COOL, UNSETTLED WEATHER WILL CONTINUE THROUGH NEXT WEEK.
THE YELLOWSTONE LOW PRESSURE SYSTEM WE'VE BEEN TRACKING IS ON
COURSE TODAY TO MOVE INTO WYOMING TOMORROW. WHILE IT'S TRAVERSING
THE AREA TONIGHT, IT WILL CAUSE MODERATE TO HEAVY SNOW FALL OVER
MUCH OF SOUTHWEST MONTANA. SEVERAL INCHES OF SNOW ACCUMULATION ARE
EXPECTED IN BUTTE, AND ALONG I-90 OVER HOMESTAKE PASS AS WELL AS
ALONG I-15 BOTH NORTH AND SOUTH OF BUTTE. THERE REMAINS A LOW
CHANCE AROUND 10 PERCENT FOR HEAVY SNOW ACCUMULATION OVER 10
INCHES ALSO IN THAT REGION.
A BROAD TROUGH REMAINS OVER THE REGION THROUGH THE WEEK WITH A
COUPLE OF EMBEDDED STORMS. THE HIGHER SOLAR ANGLE DUE TO THE
SPRING SEASON WILL CAUSE MORE INTENSE HEATING DURING THE DAY, AND
THAT ALONG WITH THE COOLER AIR ALOFT FROM THE OVERALL TROUGH
PATTERN WILL KEEP IT UNSTABLE ALL WEEK. EXPECT COOL, BREEZY
WEATHER ALL WEEK WITH NEAR DAILY SNOW AND RAIN SHOWERS.
LONG TERM ENSEMBLES STILL SHOW CONDITIONS TAKING A TURN TOWARDS
WARMER CONDITIONS AROUND APRIL 6TH OR SO WITH A RIDGE BUILDING IN.
WHILE AFTERNOON SHOWERS WILL STILL BE POSSIBLE UNDER THIS PATTERN,
THEY WILL BE WEAKER AND LESS FREQUENT.
AVIATION
A YELLOWSTONE LOW MOVING OVER THE REGION TONIGHT WILL
CAUSE SOME RAIN AND SNOW SHOWERS. TERMINAL KBTM IS THE MOST LIKELY
TO HAVE SNOW IMPACTS OVERNIGHT WITH SEVERAL INCHES OF ACCUMULATION
EXPECTED THERE TONIGHT AND TOMORROW MORNING. OTHER AREA TERMINALS
WILL ALSO SEE SHOWERS, BUT THEY ARE NOT EXPECTED TO CAUSE ANY
ACCUMULATING SNOW.
MSO WATCHES/WARNINGS/ADVISORIES
MT...WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO 9 AM MDT
SUNDAY FOR BUTTE/BLACKFOOT REGION.
ID...WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO 9 AM MDT
SUNDAY FOR EASTERN LEMHI COUNTY...WESTERN LEMHI COUNTY.
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