005
FXUS65 KGGW 202115
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
215 PM MST SAT DEC 20 2025
DISCUSSION
KEY MESSAGES:
- TEMPERATURES WILL GRADUALLY WARM INTO MONDAY WITH A SLIGHT
CHANCE OF WINTRY MIX INTO MONDAY.
- NEAR NORMAL NORTH TO SLIGHTLY WARMER THAN NORMAL TEMPERATURES
SOUTH AND LIMITED CHANCES FOR PRECIPITATION IS EXPECTED FOR
MOST OF NEXT WEEK.
WEATHER PATTERN OVERVIEW:
NEAR ZONAL FLOW CONTINUES WITH SOME INSTABILITY OVER THE AREA WITH
A WARM FRONT PRODUCING PERIODIC CLOUDS TODAY WITH MAYBE A FEW
FLURRIES. A WEAK DISTURBANCE MOVES THROUGH TONIGHT THEN SW FLOW
BEGINS TO DRAW IN SOME MOISTURE TO THE SOUTHWEST ZONES LATE
SUNDAY. THIS LOOKS TO BRING THE POSSIBILITY OF BRIEF FREEZING
RAIN IN SOME AREAS SUNDAY NIGHT THEN EXITING TO THE EAST LATE
MONDAY. LITTLE IF ANY ACCUMULATION IS EXPECTED AT THIS TIME AND
HIGHLIGHTS DON/T APPEAR TO BE A MAJOR CONCERN.
WITH THE UPPER FLOW TURNING SW, TEMPS WILL WARM A BIT INTO MONDAY
WITH HIGHS IN THE LOWER 30S NORTH TO THE 40S SOUTH.
BUT ARCTIC AIR WILL FILTER BACK IN MONDAY NIGHT AND KEEPING THE
NORTHERN/SNOW COVERED AREAS COOLER TUESDAY COMPARED TO THE BARE
GROUND AREAS OVER OUR SOUTHERN ZONES.
ARCTIC AIR MAY MOVE BACK INTO CANADA WEDNESDAY ALLOWING SOUTHERN
ZONES TO REACH THE 40S TO LOW 50S WHILE THE NORTHERN/SNOW COVERED
ZONES TO ONLY REACH THE 20S AND 30S.
THEREAFTER, DISTURBANCES WEDNESDAY NIGHT AND FRIDAY COULD BRING A
LITTLE LIGHT SNOW THAT WOULD BE APPROPRIATE FOR THE HOLIDAY
SEASON, BUT LITTLE TO NO IMPACTS ARE EXPECTED.
TEMPS LATE NEXT WEEK DIP A BIT WITH ARCTIC AIR FILTERING IN WHILE
A PACIFIC TROUGH/STORM IS IN PLACE ALONG THE WEST COAST, GIVING
CALIFORNIA THE GIFT OF RAIN AND SNOW.
FORECAST CONFIDENCE & DEVIATIONS:
GENERALLY NO CHANGES WERE MADE TO WHAT THE NBM PRODUCED TODAY.
CONFIDENCE IS HIGH TO MODERATE WITH THE FORECAST THROUGH MONDAY
BUT FALLS OFF LATER IN THE WEEK WITH THE PLACEMENT OF THE ARCTIC
FRONT AND DISTURBANCES BRINGING THE LIGHT PRECIPITATION. TFJ
AVIATION
UPDATED: 2115Z
FLIGHT CATEGORY: VFR.
DISCUSSION: A WARM FRONT WILL MOVE NORTHEAST THROUGH THE TAF SITES
TONIGHT. WINDS ARE EXPECTED TO BE LIGHT BUT LLWS CAN BE EXPECTED.
TFJ
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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