312
FXUS65 KMSO 191001
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
401 AM MDT WED AUG 19 2026
DISCUSSION
KEY MESSAGES:
- A RIDGE OF HIGH PRESSURE CAUSING HOT TEMPERATURES THROUGH THE
REMAINDER OF THE WORK WEEK.
- SHOWERS AND THUNDERSTORMS RETURNING POTENTIAL AS EARLY AS
FRIDAY AND LASTING THROUGH THE WEEKEND.
A RIDGE OF HIGH PRESSURE WILL BE BUILDING OVER THE NORTHERN
ROCKIES THE REMAINDER OF THE WORK WEEK. TEMPERATURES WILL BE
STEADILY RISING EACH DAY WITH FRIDAY EXPECTED TO BE THE HOTTEST
DAY WITH MOST LOCATIONS BEING IN THE 90S AND THE LOWER VALLEYS OF
NORTH CENTRAL IDAHO BEING WELL ABOVE 100 DEGREES.
SOME OF THE HIRES MODELS ARE SHOWING SOME MONSOONAL MOISTURE
MAKING ITS WAY UP INTO THE REGION BY FRIDAY. THIS MOISTURE COULD
LEAD TO THE DEVELOPMENT OF HIGH BASED THUNDERSTORMS ACROSS LEMHI
COUNTY INTO SOUTHWEST MONTANA. ANY STORMS THAT DEVELOP IN THIS
ENVIRONMENT COULD CAUSE STRONG OUTFLOW WINDS.
A WEAK DISTURBANCE IS EXPECTED TO MOVE THROUGH THE REGION FRIDAY
NIGHT INTO SATURDAY AHEAD OF THE TROUGH OF LOW PRESSURE. THIS
DISTURBANCE WILL CAUSE SCATTERED SHOWERS AND THUNDERSTORMS
OVERNIGHT INTO SATURDAY MORNING. THE COLD FRONT ASSOCIATED WITH
THE TROUGH IS EXPECTED TO PUSH THROUGH THE NORTHERN ROCKIES ON
LATE SATURDAY. COOLER AND BREEZY CONDITIONS ARE EXPECTED WITH THE
FRONT AND LASTING INTO SUNDAY.
THE LATEST LONG TERM MODELS ARE INDICATING ANOTHER RIDGE OF HIGH
PRESSURE BUILDING OVER THE REGION FOR THE FIRST HALF OF NEXT WEEK.
AVIATION
A RIDGE OF HIGH PRESSURE WILL BE BUILDING OVER THE
REGION TODAY CAUSING MAINLY FAIR FLYING CONDITIONS. THE BIGGEST
IMPACT TO AREA TERMINALS WILL BE SMOKE FROM LOCAL AND REGIONAL
FIRES CAUSING A REDUCTION IN VISIBILITY OVER THE NEXT 24 HOURS.
MSO WATCHES/WARNINGS/ADVISORIES
MT...NONE.
ID...NONE.
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