518
FXUS65 KGGW 202110
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
210 PM MST FRI DEC 20 2024
DISCUSSION
UPDATED: 2100Z
KEY MESSAGES:
- QUIET WEATHER THROUGH SATURDAY
- SUNDAY SYSTEM BRINGS THREAT OF LIGHT FREEZING RAIN
- STRETCH OF ABOVE NORMAL TEMPERATURES TO BEGIN THIS WEEKEND
WEATHER PATTERN OVERVIEW:
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
LLWS: GGW AND GDV COULD SEE A PERIOD OF LLWS FROM NOW THROUGH 00Z,
WITH SHEAR OF 290 DEG AT 35KTS THROUGH THE FIRST 2000FT.
UPDATED: 2100Z
FLIGHT CATEGORY: VFR.
DISCUSSION: THE CURRENT LIGHT PRECIPITATION HAS ABOUT MOVED OUT OF
THE REGION, AND QUIET CONDITIONS ARE EXPECTED THROUGH SATURDAY IN
ITS WAKE.
WINDS: EXPECT LIGHT AND VARIABLE WINDS THROUGH SATURDAY.
CLIFF
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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