030
FXUS65 KMSO 211003
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
403 AM MDT SUN JUN 21 2026
DISCUSSION
KEY MESSAGES:
- SHOWERS AND THUNDERSTORMS ALONG THE DIVIDE THIS AFTERNOON.
- WARMING TREND TUESDAY THROUGH THURSDAY
- COOLER AND SHOWERY CONDITIONS EXPECTED NEXT WEEKEND
A LOW PRESSURE SYSTEM OVER ALBERTA WILL CAUSE ISOLATED AND
SCATTERED SHOWERS AND THUNDERSTORMS TODAY ALONG THE CONTINENTAL
DIVIDE, ESPECIALLY AROUND GLACIER NATIONAL PARK. THIS LOW WILL BE
SLOWLY MOVING OFF TO THE EAST, SO THE LATEST GUIDANCE IS
INDICATING ANOTHER ROUND OF CONVECTION OVER THE SAME AREA ON
MONDAY AFTERNOON AND EVENING.
THEN A RIDGE OF HIGH PRESSURE WILL BE BUILDING OVER THE REGION
TUESDAY THROUGH THURSDAY. THIS RIDGE WILL BRING A WARMING AND
DRYING TREND OVER THE NORTHERN ROCKIES FOR A FEW DAYS.
TEMPERATURES WILL WELL ABOVE SEASONAL AVERAGES BY THURSDAY AS
READINGS WILL BE IN THE UPPER 80S TO LOW 90S FOR MOST VALLEY
LOCATIONS AND TRIPLE DIGITS FOR THE RIGGINS AREA.
THE LONG TERM MODELS ARE SHOWING A LARGE LOW PRESSURE SYSTEM
MOVING INTO THE PACIFIC NORTHWEST BY NEXT WEEKEND CAUSING
SIGNIFICANT COOLING WITH WIDESPREAD PRECIPITATION. TEMPERATURES BY
SATURDAY ARE ANTICIPATED TO BE AROUND 10 DEGREES BELOW SEASONAL
NORMALS.
AVIATION
A LOW PRESSURE SYSTEM OVER ALBERTA WILL CAUSE MID TO
HIGH LEVELS CLOUDS TO STREAM OVER NORTHWEST MONTANA ALONG WITH
SCATTERED SHOWERS AND THUNDERSTORMS, ESPECIALLY NEAR THE
CONTINENTAL DIVIDE. KGPI HAS THE BEST POTENTIAL FOR NEARBY SHOWERS
THIS AFTERNOON AND EVENING.
MSO WATCHES/WARNINGS/ADVISORIES
MT...NONE.
ID...NONE.
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