562
FXUS65 KMSO 151045
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
345 AM MST SUN DEC 15 2024
DISCUSSION
KEY MESSAGES:
- LIGHT SNOWFALL AREA-WIDE MONDAY
- MIXED PRECIPITATION OR SNOWFALL TUESDAY INTO WEDNESDAY
A SHORTWAVE WILL EXIT THE REGION THIS MORNING THEREFORE SHUTTING
OFF THE STEADY PRECIPITATION. THERE COULD BE A FEW SNOW SHOWERS
THIS AFTERNOON.
ANOTHER TROUGH WILL BRING WIDESPREAD LIGHT SNOW ON MONDAY.
SNOWFALL TOTALS IN THE MOUNTAINS, ESPECIALLY ALONG THE
IDAHO/MONTANA BORDER COULD RANGE FROM 2 TO 4 INCHES, WHILE THE
VALLEYS WILL GENERALLY BE A DUSTING UP TO 1 INCH.
MODELS CONTINUE TO BE PERSISTENT WITH BRINGING MOISTURE INTO
NORTHWEST MONTANA ON WEDNESDAY ALONG WITH A TIGHTENING SOUTHERLY
WIND GRADIENT. SNOW LEVELS WILL RISE TO BETWEEN 4000 AND 5000
FEET. THERE MAY BE SOME LIGHT SNOW ACCUMULATION OR MIXED
PRECIPITATION TO START, BUT THERE COULD BE SOME LOCATIONS THAT ARE
ABLE TO MIX OUT AND WARM INTO THE UPPER 40S OR HIT 50 DEGREES!
A RIDGE OF HIGH PRESSURE WILL BUILD OVER THE NORTHERN ROCKIES
THURSDAY, AND IS EXPECTED TO REMAIN IN PLACE INTO NEXT WEEKEND.
VALLEY FOG AND/OR STRATUS MAY BECOME AN IMPACT THURSDAY AND
FRIDAY, WITH LIGHT MOUNTAIN SNOW AND A VALLEY WINTRY MIX NEXT
WEEKEND.
AVIATION
STEADY RAIN AND SNOW SHOWERS WILL TAPER OFF BY MID-
MORNING, THEN SCATTERED SNOW SHOWERS ARE POSSIBLE THIS AFTERNOON
MAINLY FOCUSED ON THE TERRAIN. WEAK HIGH PRESSURE BUILDS TONIGHT
BEFORE ANOTHER WEATHER SYSTEM WILL BRING LIGHT SNOW DURING THE DAY
ON MONDAY.
MSO WATCHES/WARNINGS/ADVISORIES
MT...WINTER WEATHER ADVISORY UNTIL 11 AM MST THIS MORNING FOR
BITTERROOT/SAPPHIRE MOUNTAINS...BUTTE/BLACKFOOT REGION...
POTOMAC/SEELEY LAKE REGION.
ID...WINTER WEATHER ADVISORY UNTIL 11 AM MST /10 AM PST/ THIS MORNING
FOR EASTERN LEMHI COUNTY...NORTHERN CLEARWATER MOUNTAINS...
SOUTHERN CLEARWATER MOUNTAINS...WESTERN LEMHI COUNTY.
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