841
FXUS65 KGGW 300502
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
1102 PM MDT SUN MAR 29 2026
KEY MESSAGES
- A SLOW-MOVING COLD FRONT WILL BRING SCATTERED RAIN SHOWERS
THROUGH MONDAY NIGHT.
- BELOW FREEZING LOW TEMPERATURES THROUGH THE END OF THE WEEK.
WIND CHILLS APPROACHING 0 DEGREES TOMORROW NIGHT.
- NEXT CHANCE FOR WIDESPREAD RAIN/SNOW IS LINING UP AROUND
THURSDAY THROUGH FRIDAY.
DISCUSSION
WEATHER PATTERN OVERVIEW:
A SURFACE TROUGH WILL PUSH EAST PROVIDING SUFFICIENT LIFT AND
CHANNELING PACIFIC MOISTURE INTO THE REGION THIS MORNING. RAIN AND
SNOW ACCUMULATIONS WILL DEPEND ON THE LOCATION OF THE JET OVERHEAD
IN COMBINATION WITH THE SURFACE TROUGH, BUT THE MOST RECENT CAM
RUNS FAVOR LOCATIONS NORTH OF THE MISSOURI RIVER WITH STEADIER
PRECIPITATION. ENOUGH COLDER AIR HAS MIXED IN BEHIND THE TROUGH TO
ALLOW SNOW ALONG THE HI-LINE. RAIN SHOWERS BECOME A BIT MORE
SCATTERED THIS AFTERNOON AS THEY SLOWLY MOVE SOUTH AND EAST.
THIS AFTERNOON, A COLD FRONT ACCELERATES SOUTH AND OPENS THE WAY
FOR COLDER TEMPERATURES AND A HARD FREEZE BOTH TONIGHT AND
TUESDAY NIGHT. STRESS ON NEWBORN LIVESTOCK WILL BE SEVERE.
MODERATED TEMPERATURES ARE EXPECTED INTO FRIDAY WITH THE NEXT
CHANCE FOR PRECIP BEGINNING THURSDAY THROUGH FRIDAY. AMPLIFIED
TROUGH TRACKS ACROSS THE INTERMOUNTAIN WEST AND BRINGS SEVERAL
DAYS OF UNSETTLED AND LOW CONFIDENCE LATE WINTER/EARLY SPRING LIKE
WEATHER. THE TIMING AND PLACEMENT OF THE CLOSED LOW WILL
DETERMINE PRECIP TYPE AND ACCUMULATION, AND AT THIS TIME IS HIGHLY
UNCERTAIN. THIS FAR OUT, THERE IS GOOD MODEL AGREEMENT ON THIS
BEING A WIDESPREAD RAIN AND SNOW EVENT THOUGH TIMING COULD EASILY
SHIFT ABOUT 6 TO 12 HOURS.
FORECAST CONFIDENCE & DEVIATIONS:
DEVIATIONS WERE MADE TO HOURLY POPS, WIND, WIND GUSTS, AND SKY
THROUGH ABOUT 18Z TODAY BASED ON CURRENT OBSERVATIONS, RADAR, AND
SATELLITE AS THESE AFFECTS SEEM TO BE ABOUT 2 HOURS AHEAD OF
CURRENT MODEL WEATHER PATTERNS.
CONFIDENCE IS HIGH WITH THE RAINFALL/SNOW THIS MORNING.
CONFIDENCE IS LOW FOR A LAKE WIND ADVISORY TUESDAY
AFTERNOON/EVENING.
CONFIDENCE IS MODERATE FOR A SECOND RAIN/SNOW EVENT THURSDAY INTO
FRIDAY.
GAH
AVIATION
LAST UPDATE: 0430Z
FLIGHT CATEGORY: VFR - MVFR
DISCUSSION: OVERCAST CEILINGS DECREASE THROUGH TONIGHT.
INTERMITTENT MVFR CEILINGS WILL BE POSSIBLE FROM 08-15Z AT
KGGW/KOLF WITH RAIN SHOWERS. CHANCES FOR RAIN WILL EXIT KGGW AND
KOLF AROUND MID AFTERNOON AND KSDY AND KGDV AROUND THE LATE
EVENING. AREAS NORTH OF KGGW AND KOLF WILL EXPERIENCE A RAIN/SNOW
MIX IN IFR CONDITIONS WITH PRECIP EXITING KPWD BY ABOUT LATE
AFTERNOON.
WIND: EAST AROUND 10 KTS THROUGH THE MORNING HOURS. SWITCHING S
AND THEN W AND INCREASING TO 15 TO 25 GUST 35 KTS MONDAY
AFTERNOON AND EARLY EVENING. VEERING FURTHER NW AND DECREASING TO
10 TO 15 KTS IN THE LATE EVENING THROUGH THE OVERNIGHT HOURS.
GAH
GGW WATCHES/WARNINGS/ADVISORIES
LAKE WIND ADVISORY FROM NOON MONDAY TO 3 AM MDT TUESDAY FOR
CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-
GARFIELD-MCCONE-PETROLEUM.
WEATHER.GOV/GLASGOW
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