256
FXUS65 KGGW 191205
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
605 AM MDT SUN JUL 19 2026
KEY MESSAGES
- HOT TEMPERATURES ARE EXPECTED TODAY.
- THERE IS A LOW CHANCE OF THUNDERSTORMS IN THE YELLOWSTONE VALLEY
TODAY.
- A BRIEF COOLDOWN IS EXPECTED FOR MONDAY AND TUESDAY.
DISCUSSION
WEATHER PATTERN OVERVIEW:
UPPER RIDGE REMAINS OVER THE ROCKY MOUNTAIN STATES THROUGH THE
WEEK. A SHORTWAVE IS PUSHING THROUGH THE TOP OF THE RIDGE INTO THE
CANADIAN PRAIRIES TODAY. THIS WILL DRAG A WEAK COLD FRONT ACROSS
EASTERN MONTANA IT COULD SET SOME SHOWERS AND THUNDERSTORMS THIS
AFTERNOON. THE MOST SEVERE CELLS LOOK TO BE FOCUSED ACROSS THE
YELLOWSTONE VALLEY BEFORE JUMPING THE MT/ND BORDER. THERE IS
UNCERTAINTY HERE WITH SOME CAMS MOVING THE BOUNDARY ACROSS THE
BORDER ENTIRELY BEFORE GENERATING ANYTHING LEAVING THE LOCATION
MOSTLY DRY.
FOR MONDAY AND TUESDAY WITH THE RIDGE BLUNTED TO THE SOUTH FLOW
BECOMES ZONAL, DRY, AND COOLER. THE PATTERN BEGINS TO WARM UP PAST
MID WEEK WITH THE RIDGE REBOUNDING. THERE IS SOME SUGGESTION THAT
WE MAY BE LOOKING AT 100S FOR HIGHS WITH EXCESSIVE HEAT WARNINGS
AGAIN IF THIS COMES TO PASS FROM THE ENSEMBLE DATA.
FORECAST CONFIDENCE & DEVIATIONS:
CONFIDENCE AROUND THUNDERSTORMS IS VERY LOW ACROSS EASTERN MONTANA
TODAY.
AVIATION
VFR. A FEW THUNDERSTORMS ARE POSSIBLE IN THE YELLOWSTONE VALLEY
THIS AFTERNOON WITH A COLD FRONT PASSAGE.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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