842
FXUS65 KGGW 180621
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
1221 AM MDT THU JUN 18 2026
KEY MESSAGES
- COOLER AND WET CONDITIONS EXPECTED TODAY, WITH A GRADUAL WARM UP
INTO SATURDAY.
- A COLD FRONT SATURDAY NIGHT INTO SUNDAY WILL BRING ANOTHER BRIEF
ROUND OF RAIN SHOWERS. THEN, ANOTHER WARM UP INTO MID-NEXT-
WEEK.
&
DISCUSSION
WEATHER PATTERN OVERVIEW:
A BLOCKING HUDSON BAY LOW MAINTAINS ZONAL TO NORTHWEST FLOW
ACROSS THE NORTHWESTERN QUARTER OF THE CONUS THROUGH THE FORECAST
BRINGING WEAK PACIFIC SHORTWAVES FOR AFTERNOON SHOWERS AND GENERAL
THUNDERSTORMS TODAY. THESE SHOWERS SHOULD START AROUND NOON AND
END AROUND 9PM, BUT SHOULD NOT BE SEVERE. TOTALS LOOK LIGHT FOR
MOST AREAS WITH OVER AN TENTH OF AN INCH POSSIBLE IN THE FAR
NORTHEAST.
FRIDAY THROUGH SATURDAY, AN UPPER LEVEL RIDGE MOVES ACROSS THE
REGION BRINGING WARMER AND DRIER WEATHER FOR A COUPLE DAYS. GUST
SE WINDS ARE EXPECTED AHEAD OF A COLD FRONT SATURDAY NIGHT, AND
MIGHT GET HIGH ENOUGH TO REACH LAKE WIND ADVISORY CRITERIA.
SATURUDAY NIGHT THROUGH WEDNESDAY, CONDITIONS COOL OFF WITH A
COLD FRONT INITIALLY SATURDAY NIGHT INTO MID-DAY SUNDAY AS ZONAL
FLOW RETURNS INITIALLY. ANOTHER BRIEF SHORTWAVE WILL PULL RAIN
SHOWERS ACROSS THE REGION AS WELL. BUT THEN, TEMPS GRADUALLY
MEANDER UPWARD INTO THE 80S FOR HIGHS BY WEDNESDAY.
FORECAST CONFIDENCE & DEVIATIONS:
DEVIATIONS INCLUDE MINOR HOURLY ADJUSTMENT TO JARRING 6 HOUR
JUMPS/CHANGES IN NBM PPI01 POPS. ENDED UP DELETING AND
INTERPOLATING A COUPLE HOURS WORTH OF DATA AT THE 18 AND 00Z HOURS
TO TAKE THE JARRING HOURLY CHANGES OUT OF THE FORECAST FOR BETTER
HOURLY TRENDS FRIDAY.
GAH
AVIATION
LAST UPDATE: 0400Z
FLIGHT CAT RANGE: VFR - MVFR
DISCUSSION: DRY CONDITIONS WITH SCATTERED LOW CLOUDS TONIGHT. SHOWERS
AND THUNDERSTORMS ARE EXPECTED TO DEVELOP AROUND 18Z THROUGH THE
AFTERNOON AND DIMINISH AFTER 03Z. MVFR CONDITIONS ARE POSSIBLE
WHERE HEAVIER RAIN OCCURS.
WINDS: W TO NW AT 5 TO 10 KTS TONIGHT. INCREASING TO 10 TO 15 GUST
20 KTS THURSDAY AFTERNOON. CALMING TO 10 KTS OR LESS THURSDAY
EVENING THROUGH THE NIGHT.
/GAH
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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