193
FXUS65 KGGW 151145
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
445 AM MST MON DEC 15 2025
DISCUSSION
KEY MESSAGES:
- PERIODS OF STRONG WEST WINDS BEGINNING TONIGHT, MOVING
EASTWARD, CONTINUING THROUGH THURSDAY.
- SEASONABLY WARM TEMPERATURES AND MOSTLY DRIER WEATHER EXPECTED
THROUGH WEDNESDAY.
- CHANCES FOR WINTRY PRECIPITATION BEGINNING WEDNESDAY.
WEATHER PATTERN OVERVIEW:
GENERAL ZONAL PATTERN ACROSS THE CONUS THROUGH THE WEEK WITH
OCCASIONAL SHORTWAVES MOVING THROUGH THE FAST WESTERLY FLOW.
CHINOOK CONTINUES TODAY WITH VERY SHALLOW INVERSION OVER EASTERN
MONTANA ERODING. STILL EXPECT TEMPERATURES TO BE SLOWER TO MIX OUT
OF THE RIVER VALLEYS TODAY. SHORTWAVE MOVING ACROSS THE CANADIAN
ROCKIES WILL DETACH THE LEE SIDE LOW AND PUSH IT EAST TONIGHT.
COLD AIR ADVECTION FOLLOWING THE LOW WILL WORK SOUTHWARD,
PROVIDING ADDITIONAL MIXING, ESPECIALLY ACROSS CENTRAL MONTANA.
THUS HAVE UPGRADED THE HIGH WIND WATCH TO WARNING FOR PHILLIPS
COUNTY TONIGHT.
CHINOOK REDEVELOPS ON TUESDAY AS A MUCH STRONGER SHORTWAVE
APPROACHES THE PACIFIC NORTHWEST. THIS WAVE MOVES THROUGH THE
NORTHERN ROCKIES ON WEDNESDAY, BRINGING AN ALBERTA CLIPPER ACROSS
THE NORTHERN PLAINS. STRONG WINDS AGAIN EXPECTED, ALONG WITH
PRECIPITATION CHANCES. A MIX OF PRECIPITATION TYPES ARE POSSIBLE
WITH THE CLIPPER.
FORECAST CONFIDENCE & DEVIATIONS:
BLENDED NBM AND NBM90 FOR THE WINDS TONIGHT INTO TUESDAY MORNING.
AVIATION
VFR. DRY WEATHER AND MOSTLY CLEAR SKIES THROUGH THE TAF CYCLE.
LLWS WILL BE PRESENT OVER OR IN THE VICINITY OF ALL TAF SITES FOR
A MAJORITY OF THE TAF CYCLE WITH A VERY SHALLOW INVERSION AND
STRONG WINDS ABOVE THE INVERSION.
GGW WATCHES/WARNINGS/ADVISORIES
HIGH WIND WARNING FROM 5 PM THIS AFTERNOON TO 11 AM MST TUESDAY
FOR CENTRAL AND SOUTHEAST PHILLIPS-NORTHERN PHILLIPS-SOUTHWEST
PHILLIPS.
WEATHER.GOV/GLASGOW
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