553
FXUS65 KGGW 132042
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
242 PM MDT MON JUL 13 2026
KEY MESSAGES
- DANGEROUS HEAT IS BEING REDUCED TO PRAIRIE AND WIBAUX COUNTIES
TUESDAY WITH AN UPTICK WEDNESDAY. EXTENDED THE HEAT WARNING
THROUGH WEDNESDAY NIGHT FOR THOSE TWO COUNTIES AND TRIMMED THE
ADVISORY AS WELL. DANIELS AND SHERIDAN COUNTIES ARE THE ONLY
ONES THAT FELL OUT WITH NO HEAT HEADLINES AFTER TONIGHT.
- TEMPERATURES WILL REDUCE TO 80S AND 90S FOR HIGHS THROUGH THE
WORK WEEK.
- THERE IS THE POSSIBILITY OF SEVERE THUNDERSTORMS MOVING
NORTHEAST INTO THE NW ZONES TUESDAY EVENING. HIGH HUMIDITY MAY
ALSO GIVE RISE TO FLOODING CONCERNS.
DISCUSSION
WEATHER PATTERN OVERVIEW:
CLOSED UPPER HIGH WILL LINGER OVER THE NORTHERN HIGH PLAINS THE
FIRST PART OF THIS WEEK, KEEPING THE HEAT GOING OVER THE DAKOTAS
AND INTO OUR SE ZONES THROUGH WEDNESDAY. HEAT WARNINGS WERE
TRIMMED FOR TOMORROW TO JUST PRAIRIE AND WIBAUX COUNTIES. DANIELS
AND SHERIDAN COUNTIES DROP OUT OF THE ADVISORY TOMORROW WITH AN
ADVISORY FOR THE REMAINDER OF THE ZONES.
THEN AN UPPER DISTURBANCE SENDS STORMS NORTHEAST INTO THE CWA
ABOUT 03Z. UPDRAFT HELICITY AND MAX UPDRAFT FROM THE HREF IS
SHOWING SEVERE THUNDERTORM POTENTIAL FOR THE WESTERN ZONES. WITH
THE HIGH PRECIP WATERS (1.0 TO 1.8"), FLOODING COULD ALSO BE A
CONCERN. WILL GO AHEAD AND ISSUE A FLASH FLOOD WATCH FOR THE
PETROLEUM AND PHILLIPS COUNTIES.
WEDNESDAY AND BEYOND: UPPER LOW OVER THE PACIFIC NW THEN MOVES NE
INTO THE PRAIRIE PROVINCES OF CANADA WHILE THE UPPER RIDGE
REBOUNDS OVER EASTERN MONTANA. THIS SHOULD KEEP TEMPS WARMER THAN
NORMAL WITH SMALL CHANCES FOR SHOWERS AND STORMS. TFJ
FORECAST CONFIDENCE & DEVIATIONS:
GNERALLY DID NOT DEVIATE FROM NBM, BUT DID LOWER MIN RH FOR TODAY
A BIT. TFJ
AVIATION
UPDATED: 2040Z
FLIGHT CATEGORY: VFR
DISCUSSION: MAINLY DRY WEATHER AND MOSTLY CLEAR SKIES ARE
EXPECTED OVER THE TAF CYCLE. HOWEVER, SHOWERS AND THUNDERSTORMS
ARE EXPECTED TO AFFECT KGGW AFTER 03Z TUESDAY NIGHT.
SFC WIND: NE WINDS WILL NOT DECREASE AT KOLF, KSDY AND KGDV TILL
AFTER 06Z TONIGHT. THEN WINDS INCREASE FROM THE EAST AT ALL
LOCATIONS TUESDAY. TFJ
GGW WATCHES/WARNINGS/ADVISORIES
HEAT ADVISORY UNTIL 2 AM MDT WEDNESDAY FOR CENTRAL AND SOUTHEAST
PHILLIPS-CENTRAL AND SOUTHERN VALLEY-GARFIELD-MCCONE-NORTHERN
PHILLIPS-NORTHERN VALLEY-PETROLEUM-SOUTHWEST PHILLIPS-WESTERN
ROOSEVELT.
LAKE WIND ADVISORY FROM 10 AM TUESDAY TO NOON MDT WEDNESDAY FOR
CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-
GARFIELD-MCCONE-PETROLEUM.
FLOOD WATCH FROM TUESDAY EVENING THROUGH LATE TUESDAY NIGHT FOR
CENTRAL AND SOUTHEAST PHILLIPS-PETROLEUM-SOUTHWEST PHILLIPS.
HEAT ADVISORY UNTIL 2 AM MDT TUESDAY FOR DANIELS-SHERIDAN.
EXTREME HEAT WARNING UNTIL 2 AM MDT TUESDAY FOR DAWSON-EASTERN
ROOSEVELT-RICHLAND.
HEAT ADVISORY FROM 2 AM TUESDAY TO 2 AM MDT WEDNESDAY FOR DAWSON-
EASTERN ROOSEVELT-RICHLAND.
EXTREME HEAT WARNING UNTIL 2 AM MDT THURSDAY FOR PRAIRIE-WIBAUX.
WEATHER.GOV/GLASGOW
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