117
FXUS65 KGGW 302010
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
210 PM MDT FRI MAY 30 2025
DISCUSSION
KEY MESSAGES:
- DENSE SMOKE FROM CANADIAN WILDFIRES WILL AFFECT MAINLY THE
EASTERN ZONES SATURDAY.
- MAINLY DRY WEATHER AND SLOWLY WARMING TEMPERATURES WILL CONTINUE
THROUGH SATURDAY, SUNDAY FOR THE SOUTHEAST ZONES.
- SHOWERS AND THUNDERSTORMS MOVE IN LATE SUNDAY BUT THUNDERSTORMS
GENERATLLY SHOULD BE BELOW SEVERE LIMITS.
- COOL CONDITIONS TO START NEXT WEEK.
WEATHER PATTERN OVERVIEW:
WILDFIRES IN CENTRAL CANADA AND A NORTHERLY FLOW OF AIR WILL
CONTINUE PUSHING SMOKE INTO THE NORTHERN PLAINS. THE STRONGEST
PUSH OF SMOKE LOOKS TO COME IN SATURDAY EAST OF A OPHEIM-WOLF
POINT-WIBAUX LINE (ACCORDING TO THE HRRR NEAR-SURFACE SMOKE AT
ABOUT 1 PM). BUT THE LACK OF SURFACE HIGH PRESSURE AND LIGHT WINDS
SHOULD MAKE THIS TEMPORARY AND HOPEFULLY LEAVES THE AREA SATURDAY
NIGHT/SUNDAY.
OTHERWISE, THE DISTURBANCE/COLD FRONT THAT BROUGHT THE SCATTERED
SHOWERS TO THE EASTERN ZONES WITH NW WINDS TODAY WILL PUSH
FURTHER SE, SHOWERS WILL END AND WINDS WILL DECREASE THEN TURN SE
LATE TONIGHT.
SATURDAY WILL BE QUIET BUT WARM WITH HIGHS IN THE 80S AS AN UPPER
RIDGE BUILDS AHEAD OF AN UPPER TROUGH.
A COLD FRONT WILL THEN MOVE OUT FROM THE APPROACHING UPPER TROUGH
SATURDAY NIGHT, MOVING SOUTHEAST THROUGH THE CWA SUNDAY. SW FLOW
ALOFT OVER THE CWA WILL HELP TO BRING SHOWERS AND ISOLATED
THUNDERSTORMS NORTHEAST INTO THE CWA LATE IN THE DAY. THESE STORMS
SHOULD NOT BE SEVERE AS THE COOLER AIR SHOULD STABILIZE THE LOW
LEVELS. HOWEVER, IT CANNOT BE RULED OUT IN THE SOUTHERN ZONES,
CLOSER TO THE NE-SW COLD FRONT, WITH HAIL AND GUSTY WINDS.
A MORE GENERAL SHOWER AREA REMAINS OVER THE WESTERN ZONE MONDAY
MORNING THAT DISSIPATES DURING THE DAY. IT WILL BE MUCH COOLER
WITH TEMPS ABOUT 20 DEGREES LOWER THAN SUNDAY'S.
THE UPPER TROUGH WILL LINGER OVER THE AREA THROUGH THE WEEK BUT
WEAKEN. LOOK FOR TEMPS TO GRADUALLY RISE WITH OCCASIONAL ISOLATED
SHOWERS.
FORECAST CONFIDENCE & DEVIATIONS:
HIGH CONFIDENCE ON THE WARMING TREND THROUGH SUNDAY, SO WENT ABOVE
NBM SLIGHTLY WITH TEMPS COMPRESSIONAL HEATING AHEAD OF A COLD
FRONT IS A COMMON OCCURRENCE HERE.
MAINLY RODE WITH NBM NUMBERS THROUGH THE REMAINDER OF THE PERIOD.
TFJ
AVIATION
LAST UPDATED: 2015Z
FLIGHT CAT RANGE: VFR, MVFR SATURDAY
DISCUSSION: NW WINDS WILL DIMINISH BY EVENING. CANADIAN WILDFIRE
SMOKE WILL DRIFT INTO KOLF AND KSDY SATURDAY, REDUCING VISIBILITY
AND SLANTWISE VISIBILITY. SMOKE SHOULD DISSIPATE SATURDAY NIGHT
AND SUNDAY.
WIND: NW WINDS DIMINISH BY EVENING THEN BECOME LIGHT AND VARIABLE
FROM WEST TO EAST SATURDAY, BUT SE WINDS SHOULD BEGIN AT KGGW LATE
SATURDAY. TFJ
GGW WATCHES/WARNINGS/ADVISORIES
LAKE WIND ADVISORY UNTIL 7 PM MDT THIS EVENING FOR CENTRAL AND
SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-GARFIELD-MCCONE-
PETROLEUM.
WEATHER.GOV/GLASGOW
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