973
FXUS65 KGGW 131010
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
310 AM MST SAT DEC 13 2025
DISCUSSION
KEY MESSAGES:
- A STRONG WINTER STORM OVER THE AREA WILL END BY MID MORNING
TODAY.
- ARCTIC AIR REMAINS OVER THE AREA THROUGH TONIGHT.
- MUCH WARMER TEMPERATURES ARRIVE ON SUNDAY.
WEATHER PATTERN OVERVIEW:
HEADLINE HAZARD PRODUCTS HAVE BEEN MAINTAINED TO COVER ALL
REMAINING SNOW ACCUMULATIONS THROUGH EARLY THIS MORNING AND COLD
WIND CHILLS. THE AREA REMAINS ON THE PERIPHERY OF AN UPPER LEVEL
TROUGH AND SURFACE ARCTIC HIGH PRESSURE SYSTEM, KEEPING A COLD
WEATHER ADVISORY FOR THE HI-LINE TO THE NORTH DAKOTA BORDER
THROUGH NOON TODAY. THE WINTER WEATHER HEADLINES ARE SET TO END AT
8 AM THIS MORNING. THERE IS ALSO POTENTIAL FOR LAKE EFFECT CLOUDS
AND SNOW TO COME OFF OF FORT PECK LAKE TO AFFECT GLASGOW AND FORT
PECK THROUGH THIS EVENING AS WINDS ARE EXPECTED TO BE FAIRLY
LIGHT THIS AFTERNOON.
COLD WEATHER WILL STAY AROUND THIS EVENING, SO THERE IS POTENTIAL
FOR ANOTHER COLD WEATHER PRODUCT TONIGHT BEFORE TEMPERATURES
BEGIN INCREASING BY EARLY SUNDAY MORNING.
BY SUNDAY WARMER HIGH PRESSURE PUSHES IN FROM THE WEST WITH
SUBSTANTIAL TEMPERATURE RECOVERY BEING AIDED BY A CHINOOK EVENT
OFF THE EAST SIDE OF THE NORTHERN ROCKIES. THE WARM UP WILL BE AT
LEAST INITIALLY BE LIMITED DUE TO THE HEAVY SNOW COVER IN PLACE,
PARTICULARLY IN THE MILK AND MISSOURI RIVER VALLEYS. HOWEVER, THE
WINDS JUSTIFY MIXING DOWN ABOVE FREEZING TEMPERATURES BY MONDAY
AFTERNOON THROUGHOUT THE AREA. POTENTIAL HAZARDS TO WATCH FOR WITH
THIS CHINOOK PATTERN NEXT WEEK WILL BE HIGH WINDS IN THE LITTLE
ROCKIES, AS WELL AS FOG AND MINOR FLOODING FROM SNOW MELT.
FORECAST CONFIDENCE & DEVIATIONS:
THERE IS HIGH CONFIDENCE IN WIND CHILLS REMAINING BELOW ZERO
THROUGH EARLY SUNDAY MORNING. BESIDE AREAS AROUND FORT PECK LAKE,
THERE IS HIGH CONFIDENCE OF SNOW COMING TO AN END BY 8 AM THIS
MORNING. MADE SLIGHT ADJUSTMENTS TO WINDS, POPS, AND TEMPERATURES
THROUGH TOMORROW TO ACCOUNT FOR MORE EXTREME COLD WITH THE ARCTIC
AIRMASS AND CHALLENGES OF MIXING OUT THE INVERSION ON SUNDAY
GIVEN LOW CONFIDENCE FOR ABOVE FREEZING TEMPERATURES AT LOWER
ELEVATIONS THEN.
AVIATION
LAST UPDATED: 1010Z
FLIGHT CAT RANGE: LIFR TO VFR
DISCUSSION: A WINTER STORM OVER THE AREA WILL SLOWLY WIND DOWN
FROM NORTH TO SOUTH THROUGH THE DAY. WITH LIGHT WINDS AND COLD
TEMPERATURES OVER FORT PECK LAKE, THERE IS MODERATE CONFIDENCE OF
MVFR AND SCATTERED IFR OCCURRING FOR KGGW THROUGH 00Z TODAY FROM
CLOUDS AND ISOLATED SNOW SHOWERS COMING OFF THE LAKE. THERE IS
MODERATE CONFIDENCE ALL OTHER TAF SITES WILL REACH VFR CONDITIONS
BY 21Z. COLD TEMPERATURES ARE EXPECTED TO REMAIN IN PLACE THROUGH
TONIGHT BEFORE IMPROVING ON SUNDAY.
WINDS: EAST AT 5 TO 10 KNOTS, BECOMING LIGHT AND VARIABLE AFTER
15Z, BECOMING SOUTHEAST AT 5 TO 15 KNOTS AFTER 00Z.
GGW WATCHES/WARNINGS/ADVISORIES
COLD WEATHER ADVISORY UNTIL NOON MST TODAY FOR CENTRAL AND
SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-DANIELS-DAWSON-
EASTERN ROOSEVELT-MCCONE-NORTHERN PHILLIPS-NORTHERN VALLEY-
RICHLAND-SHERIDAN-WESTERN ROOSEVELT-WIBAUX.
WINTER STORM WARNING UNTIL 8 AM MST THIS MORNING FOR CENTRAL AND
SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-DAWSON-GARFIELD-
MCCONE-NORTHERN PHILLIPS-PETROLEUM-PRAIRIE-SOUTHWEST PHILLIPS-
WIBAUX.
WINTER WEATHER ADVISORY UNTIL 8 AM MST THIS MORNING FOR DANIELS-
EASTERN ROOSEVELT-NORTHERN VALLEY-RICHLAND-WESTERN ROOSEVELT.
WEATHER.GOV/GLASGOW
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