852
FXUS65 KGGW 200932
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
232 AM MST FRI DEC 20 2024
DISCUSSION
KEY MESSAGES:
- NE ZONES SEE SUBZERO TEMPS THIS MORNING AND SNOW SHOWERS TODAY
- SUNDAY SYSTEM BRINGS THREAT OF LIGHT FREEZING RAIN
- STRETCH OF ABOVE NORMAL TEMPERATURES TO BEGIN THIS WEEKEND
WEATHER PATTERN OVERVIEW:
NORTHWEST FLOW ALOFT WILL BRING A WEAK CLIPPER SYSTEM TO MOVE
ACROSS THE REGION TODAY, PROVIDING LIGHT SNOW SHOWERS FOR AREAS
MAINLY NORTHEAST OF GLASGOW TO SIDNEY ON FRIDAY. UP TO AROUND AN
ADDITIONAL HALF INCH OF SNOWFALL IS EXPECTED AT THIS TIME. IT WILL
ALSO BRING A WARM FRONT THROUGH THE AREA WHICH WILL PUSH THE
ARCTIC AIR TO THE EAST.
THE REGION DRIES OUT ON SATURDAY WITH AN UPPER RIDGE MOVING
THROUGH THE AREA. MEANWHILE, A SHORTWAVE TROUGH WILL MOVE INLAND
FROM THE PACIFIC AND REACH THE FORECAST AREA SUNDAY MORNING.
WARM AIR ALOFT COMBINED WITH BELOW FREEZING MORNING TEMPERATURES
WILL ALLOW FOR A GOOD CHANCE OF FREEZING RAIN AT SOME POINT
SUNDAY OVER MOST OF THE FORECAST AREA WITH A CHANCE OF LIGHT RAIN
ONCE THE TEMPERATURES RISE ABOVE FREEZING. MOST AREAS ALONG AND
NORTH OF US 2 HAS A 60 TO 80 PERCENT OF ACCUMULATING A 0.01 INCH
OR MORE OF ICE ON SUNDAY.
TEMPERATURES WILL BE ABOVE NORMAL NEXT WEEK. AN UPPER RIDGE IS
EXPECTED MONDAY AND TUESDAY AND WHILE THE RIDGE FLATTENS SOMEWHAT
ON CHRISTMAS DAY WITH A SHORTWAVE TROUGH, MOST OF THE MOISTURE
STAYS TO THE SOUTH.
FORECAST CONFIDENCE & DEVIATIONS:
THE WARM FRONT TODAY WILL BRING A WIDE OF TEMPERATURES WITH HIGHS
FROM THE TEENS NE TO THE 50S SW AND WHILE THE CONFIDENCE IN
TEMPERATURES IS HIGH IN THE EXTREMES, IT LOW IN BETWEEN DUE TO
EXACTLY WHERE THE FRONT WILL BE THIS AFTERNOON. CONFIDENCE IS
MODERATE ON THE FREEZING RAIN ON SUNDAY. CONFIDENCE IS HIGH ON THE
ABOVE NORMAL MOST OF THE TIME SATURDAY AND BEYOND.
AVIATION
UPDATED: 0920Z
FLIGHT CATEGORY: VFR MOST OF THE TIME, AREAS OF MVFR NORTH.
DISCUSSION: THERE WILL BE VARYING AMOUNTS OF LOW AND MID LEVEL
CLOUDS ACROSS THE REGION THIS MORNING AND SKIES WILL CLEAR FROM
WEST TO EAST THIS AFTERNOON. THERE WILL BE OCCASIONAL MVFR CIGS
MAINLY NORTH ALONG THE CANADIAN BORDER TODAY LIGHT SNOW IS
POSSIBLE AT TIMES. SKIES WILL BE MOSTLY CLEAR THIS EVENING WITH
SOME INCREASE IN MID LEVEL CLOUDS LATE TONIGHT.
WINDS: EAST TO SE TODAY AT 5 TO 15 KNOTS BECOMING LIGHT AND
VARIABLE THIS EVENING.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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