149
FXUS65 KGGW 180812
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
212 AM MDT MON MAY 18 2026
KEY MESSAGES
- OVERNIGHT TEMPERATURES TONIGHT WILL BE AT OR NEAR FREEZING.
- WARM WEATHER RETURNS MID WEEK. THE NEXT CHANCE FOR SHOWERS
RETURNS WEDNESDAY.
DISCUSSION
WEATHER PATTERN OVERVIEW:
A STRONG UPPER TROUGH WILL KEEP COOL CONDITIONS THROUGH TONIGHT
BEFORE WEAKENING AND ALLOWING TEMPERATURES CLIMB CLOSER TO NORMAL
BY WEDNESDAY. TONIGHT LOW TEMPERATURES LOOK TO DROP BELOW
FREEZING WITH CLEARING SKIES AND LIGHT WIND. WITH THESE COOLER
TEMPERATURES, MAKE SURE TO PROTECT SENSITIVE VEGETATION.
BY MID WEEK UPPER LEVEL RIDGING OVER THE WEST COAST WILL ALLOW
QUICK MOVING SHORTWAVE TROUGHS TO SNEAK THROUGH THE OVERALL QUASI-
ZONAL FLOW, BRINGING SOME ISOLATED THUNDERSTORM CHANCES THROUGH
THE END OF THE WEEEEEK (GET IT? IT'S LIKE A ROLLERCOASTER). THE
BEST CHANCE FOR THUNDERSTORMS WILL BE WEDNESDAY. MODEL PLUMES
CONTINUE TO SUGGEST WEAK INSTABILITY IN THE ~300 J/KG MLCAPE RANGE
DURING WEDNESDAY EVENING. GEFS FORECAST RH AND DEWPOINT FOR
WEDNESDAY EVENING CONTINUE TO RISE.
FORECAST CONFIDENCE & DEVIATIONS:
NO CHANGES TO NBM.
AVIATION
LAST UPDATED: 0730Z
FLIGHT CAT RANGE: MVFR, IFR THROUGH 18Z.
DISCUSSION: LOW OVERCAST SKIES WITH BRIEF, LIGHT RAIN SHOWERS
POSSIBLE THROUGH EARLY THIS MORNING. IFR CEILINGS DROPPING AS LOW
AS 500FT INTERMITTENTLY OVER KGDV AND KSDY UNTIL 18Z.
WINDS: NORTH WINDS 10 TO 15 MPH THROUGH 3Z TOMORROW. LIGHT AND
VARIABLE THEREAFTER.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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