576
FXUS65 KGGW 172222
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
322 PM MST WED DEC 17 2025
DISCUSSION
KEY MESSAGES:
- A HIGH WIND WARNING REMAINS IN EFFECT FOR ALL OF NORTHEAST
MONTANA THROUGH 3 AM.
- A BLIZZARD WARNING HAS BEEN ISSUED FOR A PORTION OF THE AREA
LATE THIS AFTERNOON AND TONIGHT FOR AREAS OF WHITEOUT CONDITIONS
FROM FALLING/BLOWING SNOW.
- A COLD WEATHER ADVISORY IS IN EFFECT FOR SHARPLY COLDER
CONDITIONS IN FAR NE MONTANA TONIGHT BRINGING WIND CHILLS AS LOW
AS 30 BELOW.
WEATHER PATTERN OVERVIEW:
A WIDESPREAD, LONG DURATION HIGH WIND EVENT ACROSS THE REGION
WILL CONTINUE THROUGH LAST TONIGHT. A DEEP SURFACE LOW PRESSURE
SYSTEM DROPPING SOUTHEAST IS BRINGING DANGEROUS AND DESTRUCTIVE
WINDS AS HIGH AS 40 TO 50 MPH, WITH GUSTS EXCEEDING 80 MPH. AFTER
AN INITIAL PUSH EARLIER THIS AFTERNOON, A SHARP COLD FRONTAL
PASSAGE FROM THE NORTHWEST WILL BRING CONCERNS ADDITIONAL WINTER
WEATHER CONCERNS. WHITEOUT CONDITIONS FROM FALLING AND BLOWING
SNOW AND WIND CHILLS AS LOW AS 30 BELOW ARE EXPECTED TONIGHT.
WHILE SNOWFALL AMOUNTS ARE NOT EXPECTED TO BE MUCH MORE THAN 1-2",
THE PERSISTENT STRONG WINDS CAN EASILY LEAD TO PERIODS OF WHITE
OUT CONDITIONS. THE HIGHEST FORECAST SNOW AMOUNTS OF 2-3" NEAR
THE CANADIAN BORDER AND BIG SHEEPS WILL ENHANCE BLOWING SNOW
POTENTIAL WITH SOME OF THE WORST CONDITIONS EXPECTED IN EXPOSED,
ELEVATED AREAS. TO THE SOUTH WHERE THERE IS UNDER AN INCH OF SNOW
FORECASTED, A WINTER WEATHER ADVISORY IS IN EFFECT FOR MORE
LIMITED BLOWING SNOW. TRAVEL DURING ALL THIS TIME WILL BE
PARTICULARLY DANGEROUS WITH THE COMBINED WIND, COLD AND
SNOW/VISIBILITY HAZARDS, ESPECIALLY FOR HIGH PROFILE VEHICLES.
THE STRONG WINDS WILL QUICKLY DIMINISH TOMORROW MORNING WITH A
WARMING TREND THROUGH FRIDAY. THE NEXT CHANCE FOR LIGHT MIXED
PRECIPITATION COMES WITH THIS TRANSITION TOMORROW NIGHT INTO
FRIDAY.
FORECAST CONFIDENCE & DEVIATIONS:
BLENDED HRRR FOR WINDS IN SHORT TERM DAY 1 BEFORE THE FRONTAL
PASSAGE. INCREASED DAY 1 WINDS, AND 88% NBM90 FOR WIND GUSTS.
TODAY THROUGH TONIGHT PRECIP AND TEMPERATURES: HIGH CONFIDENCE.
TOMORROW THROUGH THE WEEKEND TEMPERATURES: MODERATE CONFIDENCE.
TOMORROW THROUGH THE WEEKEND PRECIP: MODERATE CONFIDENCE.
AVIATION
UPDATED: 2200Z
FLIGHT CATEGORY: VFR-MVFR, THEN AREAS LIFR-VLIFR AFTER 00Z
DISCUSSION: THROUGH THE EVENING 30-40 KTS SUSTAINED AND GUSTS UP
TO 70 KTS OUT OF THE WEST. BETWEEN 00Z AND 12Z TONIGHT FALLING
AND BLOWING SNOW WILL SIGNIFICANTLY REDUCE VISIBILITY AND
DRIFTING ACROSS RUNWAYS. PERIODS OF EXTREME COLD AT OR NEAR TAF
SITES BEGIN AFTER 12Z.
GGW WATCHES/WARNINGS/ADVISORIES
HIGH WIND WARNING UNTIL 3 AM MST THURSDAY FOR CENTRAL AND
SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-DANIELS-DAWSON-
EASTERN ROOSEVELT-GARFIELD-MCCONE-NORTHERN PHILLIPS-NORTHERN
VALLEY-PETROLEUM-PRAIRIE-RICHLAND-SHERIDAN-SOUTHWEST PHILLIPS-
WESTERN ROOSEVELT-WIBAUX.
WINTER WEATHER ADVISORY UNTIL 6 AM MST THURSDAY FOR CENTRAL AND
SOUTHEAST PHILLIPS-GARFIELD-PRAIRIE-SOUTHWEST PHILLIPS-WIBAUX.
BLIZZARD WARNING UNTIL 6 AM MST THURSDAY FOR CENTRAL AND
SOUTHERN VALLEY-DANIELS-DAWSON-EASTERN ROOSEVELT-MCCONE-NORTHERN
PHILLIPS-NORTHERN VALLEY-RICHLAND-SHERIDAN-WESTERN ROOSEVELT.
COLD WEATHER ADVISORY FROM 10 PM THIS EVENING TO 10 AM MST
THURSDAY FOR CENTRAL AND SOUTHERN VALLEY-DANIELS-EASTERN
ROOSEVELT-NORTHERN PHILLIPS-NORTHERN VALLEY-RICHLAND-SHERIDAN-
WESTERN ROOSEVELT.
WEATHER.GOV/GLASGOW
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