559
FXUS65 KGGW 130531
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
1131 PM MDT SUN APR 12 2026
KEY MESSAGES
- SEASONABLE TEMPERATURES AND WIDESPREAD RAIN SHOWERS WITH
SCATTERED THUNDERSTORMS ARE EXPECTED TODAY THROUGH TONIGHT.
- BELOW NORMAL TEMPERATURES WITH MIXED PRECIPITATION AND GUSTY NW
WINDS IN THE AFTERNOON THURSDAY AND FRIDAY.
DISCUSSION
WEATHER PATTERN OVERVIEW:
UPPER LOW OFF THE NORTHERN CALIFORNIA COAST WILL LIFT THROUGH THE
GREAT BASIN THROUGH THE EARLY HALF OF THE WEEK. THIS WILL CONTINUE
TO PUSH PACIFIC MOISTURE INTO THE STATE, WITH ANOTHER ROUND OF
SHOWERS POSSIBLE TODAY INTO TONIGHT. ISOLATED THUNDERSTORMS
EMBEDDED IN THE RAIN SHOWERS COULD PRODUCE SOME BRIEF GUSTY
WINDS.
THE NEXT UPPER TROUGH MOVES FROM THE PCNW INTO THE NORTHERN
ROCKIES ON WEDNESDAY AND INTO THE PLAINS THROUGH FRIDAY. THIS
WILL LEAD TO ANOTHER ROUND OF SHOWERS, AND WITH COLDER AIR IN THE
TROUGH, MIXED PRECIPITATION IS POSSIBLE ACROSS MUCH OF THE REGION
WEDNESDAY NIGHT INTO FRIDAY MORNING, PARTICULARLY FOR ELEVATED
AREAS.
CHANCES FOR A QUARTER INCH OF RAIN OVER THIS TIME PERIOD ARE
ABOUT 20 - 60% ACROSS NORTHEAST MONTANA. CHANCES FOR 1" OF SNOW
ARE BETWEEN 20 - 30% WITH HIGHEST CHANCES ALONG THE CANADIAN
BORDER AND OVER THE LITTLE ROCKIES.
FORECAST CONFIDENCE & DEVIATIONS:
DEVIATIONS FROM NBM INCLUDE SLIGHT ADJUSTMENTS TO THE NEXT 24
HOURS OF SKY GRIDS TO GET OVC INTO THE GRIDS FOR TAFS.
HIGH CONFIDENCE IN A TENTH OF AN INCH CWA WIDE WED NIGHT TO
FRIDAY. LOW CONFIDENCE IN SNOW ACROSS NORTHERN CWA DAY TO THURSDAY
NIGHT TO FRIDAY MORNING.
GAH
AVIATION
LAST UPDATE: 0400Z
FLIGHT CAT RANGE: VFR - IFR
DISCUSSION: INCOMING SHOWERS ARE EXPECTED TO BEGIN THIS MORNING
AND BE ON AND OFF THROUGH THE DAY. VFR CEILINGS START IMPACTING
THE TERMINALS AROUND 09Z AND EXPAND TO ALL TERMINALS BY 13Z MID
MORNING. SOME ISOLATED LIGHTNING IS POSSIBLE WITH THESE SHOWERS AT
KGDV AND KSDY BUT IS CURRENTLY TOO LIMITED TO PLACE IN THE TAF
DIRECTLY. IFR CEILING MAY BE MET AROUND 14-20Z BEFORE LIFTING
BACK TO MVFR. SHOWERS SHOULD EXIT ALL TERMINALS BY ABOUT 06-07Z
TUESDAY MORNING WITH SLOW CLEARING ACROSS THE WEST MONDAY EVENING.
BUT, MVFR CEILINGS WILL LINGER IN THE EAST UNTIL MID-DAY TUESDAY.
SFC WIND: NE TO E AT 10 TO 15 KTS OR LESS THROUGH THE MORNING AND
AFTERNOON. KGDV MAY BECOME LIGHT AND VARIABLE MONDAY NIGHT WITH E
WIND REMAINING BELOW 10 KTS FOR THE OTHER TERMINALS. THEN LIGHT
AND VARIABLE FOR ALL AFTER MIDNIGHT.
GAH
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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