480
FXUS65 KGGW 300940
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
340 AM MDT SAT AUG 30 2025
DISCUSSION
KEY MESSAGES:
- A FEW SHOWERS OR THUNDERSTORMS WILL MOVE ACROSS EASTERN MONTANA
TODAY.
- WARM AND DRY CONDITIONS WILL FINISH OUT THE HOLIDAY WEEKEND
BEFORE A COLD FRONT SWINGS THROUGH THE REGION ON TUESDAY.
WEATHER PATTERN OVERVIEW:
A WEAK REX-BLOCK LOW PRESSURE BOUNDARY WILL LINGER OVER THE
NORTHERN PLAINS THROUGH THE WEEKEND. SOME MONSOONAL MOISTURE HAS
MADE IT INTO MONTANA BUT IS EXPECTED TO BE SHUNTED EAST TODAY.
SOME SHOWERS ARE POSSIBLE BUT VERY LITTLE ACCUMULATION IS
EXPECTED WITH A DRY BOUNDARY LAYER. THE STRONGER PORTION OF THE
BOUNDARY WILL MOVE INTO NORTH DAKOTA ALONG WITH THE MOISTURE ON
SUNDAY FOR A RETURN OF DRY AND WARM WEATHER TO NORTHEAST MONTANA
THROUGH LABOR DAY.
A FAIRLY STRONG LOW PRESSURE WILL SWING THROUGH CENTRAL CANADA ON
TUESDAY, AS IT TRACKS TOWARD THE GREAT LAKES. THIS WILL DROP A
COLD FRONT INTO MONTANA. A FEW SHOWERS OR THUNDERSTORMS ARE
POSSIBLE, MAINLY NEAR THE NORTH DAKOTA BORDER WITH THE FRONT.
PRESSURE RISES AND COLD AIR ADVECTION SUGGEST WINDS WILL INCREASE,
AND MAY REACH LAKE WIND CRITERIA, BUT MODELS NOT INDICATING THIS
YET. CURRENT GUIDANCE SUGGESTS SLOWER COLD AIR ADVECTION, WHICH
MAY SUPPRESS THE WINDS SLIGHTLY. COOLER TEMPERATURES LINGER
THROUGH MIDWEEK WHILE SHARP WESTERN RIDGE SLIDES SLOWLY EAST BY
THE WEEKEND.
FORECAST CONFIDENCE & DEVIATIONS:
NO MAJOR DEVIATIONS FROM THE NBM.
CONFIDENCE IN PRECIPITATION FOR THE REGION TODAY IS LOW.
AVIATION
VFR. MID AND HIGH-LEVEL CLOUDS WILL BE OVER THE REGION TODAY.
ISOLATED TO SCATTERED RAIN SHOWERS AND THUNDERSTORMS ARE POSSIBLE
AROUND KGGW TODAY AND AROUND KGDV THIS AFTERNOON. MVFR CEILINGS
ARE POSSIBLE IF SHOWERS DEVELOP.
EQUIPMENT: KGDV AWOS HAS RETURNED TO SERVICE.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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