187
FXUS65 KGGW 181218
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
618 AM MDT SAT JUL 18 2026
KEY MESSAGES
- UPPER RIDGING WILL KEEP ABOVE AVERAGE TEMPERATURES IN PLACE
THROUGH THE WEEKEND. HEAT RELATED EFFECTS ARE POSSIBLE
ESPECIALLY SATURDAY WHEN THE HUMIDITY IS A FACTOR.
- THERE IS A LOW CHANCE OF THUNDERSTORMS THROUGH SUNDAY BUT TIMING
AMOUNTS AND PLACEMENTS ARE LOW CONFIDENCE.
- A BRIEF COOLDOWN IS EXPECTED MONDAY.
DISCUSSION
WEATHER PATTERN OVERVIEW:
UPPER RIDGE OVER THE WESTERN STATE WILL BE KNOCKED DOWN SLIGHTLY
BY A SHORTWAVE/UPPER LOW PUSHING THROUGH WESTERN CANADA THROUGH
THE WEEKEND. THIS WAVE WILL TAP THE DEEP MONSOONAL MOISTURE TO
OFFER DAILY CHANCES FOR THUNDERSTORMS. HIGH PRECIPITABLE WATER
VALUES WILL MEAN ANY GIVEN STORM COULD BE A PROLIFIC RAINFALL
PRODUCER. IN ADDITION, THE SPC HAS INCLUDED THE NORTHWESTERN
CORNER FOR TODAY, AND THE SOUTHEAST CORNER FOR SUNDAY IN A
MARGINAL RISK FOR SEVERE THUNDERSTORMS BUT THE LATEST CAMS ARE
SHOWING LOW CHANCES FOR OUR CWA.
THE HOT TEMPERATURES WILL BE SHIFTING EASTWARD THROUGH THE
WEEKEND, WITH TEMPERATURES DROPPING CLOSE TO NORMAL BY MONDAY AS
THE SHORTWAVE MOVES EAST.
THE UPPER RIDGE RETURNS NEXT WEEK AND THAT WILL ALLOW TEMPS TO
REBOUND TO WELL ABOVE NORMAL BY THE END OF THE WEEK.
FORECAST CONFIDENCE & DEVIATIONS:
NO SIGNIFICANT DEVIATIONS WERE MADE TO THE FORECAST. CONFIDENCE
FOR THUNDERSTORMS IS GENERALLY LOW FOR MUCH OF THE CWA THROUGH
SUNDAY.
AVIATION
VFR. ISOLATED TO SCATTERED THUNDERSTORMS PUSHING IN FROM THE WEST
MAY LEAD TO BRIEF REDUCTIONS IN CEILINGS.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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