963
FXUS65 KMSO 190755
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
155 AM MDT FRI JUN 19 2026
DISCUSSION
KEY MESSAGES:
- THUNDERSTORMS RETURN TO LEMHI COUNTY IDAHO AND SOUTHWEST MONTANA
THIS WEEKEND.
- A WARMING TREND CONTINUES THROUGH MID-WEEK WITH GENERALLY MILD
WEATHER AHEAD.
A SURGE OF SOUTHWEST MONSOON MOISTURE CURRENTLY VISIBLE ON WATER
VAPOR SATELLITE IMAGERY IN NORTHERN CALIFORNIA AND SOUTHERN OREGON
WILL WORK ITS WAY INTO OUR REGION THIS EVENING. TOMORROW THAT
MOISTURE WILL INTERACT WITH A SHORTWAVE DROPPING OUT OF THE
NORTHWEST, AND CAUSE SOME THUNDERSTORMS IN LEMHI COUNTY, ID AND
SOUTHWEST MONTANA. SOME OF THE VERY SPARSELY POPULATED WILDERNESS
AREAS IN SOUTHERN IDAHO COUNT MAY BE IMPACTED ALSO. THE AMOUNT OF
MOISTURE ISN'T EXCEPTIONAL, BUT IT WILL BE ENOUGH TO FUEL SOME
THUNDERSTORMS AND CAUSE CLOUD TO GROUND LIGHTNING.
OTHERWISE, PLEASANT WEATHER CONTINUES TO BE THE NORM WITH A RIDGE
AXIS OVER THE US WEST COAST. THE WEAK TROUGH THAT WILL TRIGGER
SOME THUNDERSTORMS IN SOUTHWEST MONTANA TOMORROW WILL JUST COOL
TEMPERATURES A FEW DEGREES ACROSS THE REGION THROUGH MONDAY. THEN
THE RIDGE WILL STRENGTHEN AGAIN AND EXPAND EASTWARD. THAT WILL
CAUSE A WARMING AND DRYING TREND ACROSS MOST OF CENTRAL IDAHO AND
WESTERN MONTANA, ALONG WITH LIGHTER WINDS. HIGH TEMPERATURES ARE
EXPECTED TO PEAK NEAR 90 DEGREES IN WESTERN MONTANA ON WEDNESDAY,
WHICH WILL BE ONE OF THE HOTTEST DAYS OF THE YEAR SO FAR.
AVIATION
THE RIDGE ALONG THE US WEST COAST WILL CONTINUE TO
KEEP MILD CONDITIONS ACROSS THE REGION THROUGH THE NEXT WEEK. THE
ONLY POTENTIAL INTERRUPTION WE CAN SEE SO FAR IS SOME SCATTERED
THUNDERSTORM POTENTIAL AFFECTING TERMINALS KSMN AND KBTM TOMORROW
(SATURDAY).
MSO WATCHES/WARNINGS/ADVISORIES
MT...NONE.
ID...
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