578
FXUS65 KGGW 151224
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
624 AM MDT WED APR 15 2026
KEY MESSAGES
- BELOW NORMAL TEMPERATURES THURSDAY AND FRIDAY WITH GUSTY NW
WINDS.
- RAIN TONIGHT WITH RAIN CHANGING TO SNOW ON THURSDAY.
DISCUSSION
WEATHER PATTERN OVERVIEW:
SURFACE LOW PRESSURE OVER THE SOUTHERN PRAIRIE PROVINCES WILL
REMAIN TO OUR NORTH THROUGH THIS MORNING. AN UPPER TROUGH DROPPING
INTO THE PACIFIC NORTHWEST WILL HELP TO REDEVELOP THE SURFACE LOW
OVER CENTRAL MONTANA TODAY. THIS LOW WILL TRACK ACROSS EASTERN
MONTANA TONIGHT WITH A COLD FRONT WHICH WILL ALLOW COLDER AIR TO
DROP INTO MONTANA WHILE A MOISTURE STREAM PUNCHES NORTHEAST
THROUGH MONTANA.
RAINFALL IS EXPECTED TO BEGIN OVER THE WESTERN ZONES THIS
EVENING AND SPREAD EAST OVERNIGHT. COLDER AIR WILL CHANGE THE RAIN
TO SNOW OVER THE NW ZONES THURSDAY MORNING, THE NE ZONES THURSDAY
AFTERNOON, AND REMAINDER OF THE FORECAST AREA THURSDAY EVENING
BEFORE THE PRECIPITATION ENDS THURSDAY NIGHT.
THE DETERMINISTIC MODELS WERE WETTER WITH THIS LATEST RUN AND THUS
SLIGHTLY HIGHER SNOW TOTALS. ADVISORY SNOWFALL IS POSSIBLE ACROSS
MOST OF PHILLIPS, NORTHERN VALLEY AND DANIELS COUNTIES.
SYSTEM MOVES OUT THURSDAY NIGHT WITH QPF FOOTPRINTS OVER SOUTHERN
SASK AND SE MONTANA. TEMPS THURSDAY NIGHT DROP INTO THE TEENS
NORTH, LOW 20S SOUTH, ABOUT 15 DEGREES BELOW NORMAL.
SURFACE HIGH WILL LOCK IN THE COLD OVER THE AREA FRIDAY WITH HIGH
TEMPS ONLY REACHING THE 30S TO LOW 40S, POSSIBLY ONLY UPPER 20S
NEAR SPOTS ALONG THE CANADIAN BORDER.
SURFACE HIGH DROPS TO OUR SOUTH WHILE UPPER RIDGE MOVES IN FOR
SATURDAY. TEMPS SHOULD REBOUND INTO THE 40S EAST TO THE 50S WEST
(FOR HIGHS). THE WARMING TREND CONTINUES INTO SUNDAY WITH HIGHS
MAINLY IN THE 60S.
FORECAST CONFIDENCE & DEVIATIONS:
NBM DEVIATIONS INCLUDE:
- INCREASED WINDS THURSDAY AND THURSDAY EVENING
- LOWERED TEMPS THURSDAY
AVIATION
LAST UPDATE: 1230Z
FLIGHT CAT RANGE: VFR - IFR
DISCUSSION: EXPECT INCREASING MID TO HIGH CLOUDS DURING THE DAY AS
THE NEXT SYSTEM MOVES IN. IT SHOULD ARRIVE TONIGHT WITH WITH MVFR
CEILINGS AND RAIN ENTERING THE PICTURE AROUND 05 TO 07Z. RAIN WILL
EXPECTED SOUTHEAST THROUGH THE EVENING WITH IFR CEILINGS SHOWING
UP MID-MORING THURSDAY. A TRANSITION TO SNOW IS EXPECTED AROUND
THAT SAME TIME.
WIND: WEST TO SW AND INCREASING TO 10 TO 15 KNOTS THIS AFTERNOON.
BECOMING LIGHT AND VARIABLE THIS EVENING. THEN N TO NW AT 10- 15
KTS AFTER MIDNIGHT.
GAH
GGW WATCHES/WARNINGS/ADVISORIES
LAKE WIND ADVISORY FROM 9 AM TO 9 PM MDT THURSDAY FOR CENTRAL
AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-GARFIELD-
MCCONE-PETROLEUM.
WEATHER.GOV/GLASGOW
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