502
FXUS65 KMSO 271007
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
407 AM MDT TUE OCT 27 2026
DISCUSSION
KEY MESSAGES:
- ANTICIPATE COOLER TEMPERATURES AND PERIODS OF VALLEY RAIN AND
MOUNTAIN WITH THE WEATHER PATTERN THROUGH THE WEEK.
THE FIRST LOW PRESSURE SYSTEM IS CURRENTLY OVER THE NORTHERN
ROCKIES CAUSING WRAP AROUND PRECIPITATION TO STREAM INTO NORTHWEST
MONTANA THIS MORNING. SNOW LEVELS APPEAR TO BE HOVERING AROUND
5000 FEET SO MARIAS PASS COULD BE EXPERIENCING SOME SNOW
ACCUMULATIONS. THE REMAINDER OF THE REGION WILL EXPERIENCE
SCATTERED SHOWERS THROUGHOUT THE DAY AS TEMPERATURES WILL BE
RUNNING AROUND 5 DEGREES BELOW SEASONAL AVERAGES.
A SECONDARY WEAKER DISTURBANCE IS STILL EXPECTED TO MOVE ACROSS
THE NORTHERN ROCKIES LATER TONIGHT INTO WEDNESDAY MORNING
ENHANCING THE SHOWER ACTIVITY ESPECIALLY ACROSS NORTH CENTRAL
IDAHO INTO NORTHWEST MONTANA.
A STRONGER LOW PRESSURE SYSTEM WILL DEVELOP JUST OFF THE PACIFIC
NORTHWEST COAST BY THURSDAY MORNING, DRAWING SLIGHTLY COOLER AIR
TO BE PULLED OVER THE CONTINENTAL DIVIDE AROUND GLACIER NATIONAL
PARK. THIS COOLER AIR WILL CAUSE SNOW LEVELS TO DROP TO AROUND
3000 FEET AND ANY LINGER SHOWER ACTIVITY WEDNESDAY NIGHT INTO
THURSDAY MORNING COULD CAUSE SOME SNOW ACCUMULATIONS DOWN TO WEST
GLACIER AND HUNGRY HORSE AREA.
THIS LOW WILL SHIFT SLIGHTLY TO THE EAST FRIDAY INTO SATURDAY
CAUSING SOUTHWESTERLY UPPER LEVEL FLOW TO DEVELOP OVER THE
NORTHERN ROCKIES. TEMPERATURES WILL WARM TO MORE SEASONAL READINGS
AS SNOW LEVELS RISE BACK TO AROUND 5000 FEET.
THE LATEST LONG TERM MODELS ARE STARTING TO INDICATE THAT THE LOW
WILL MOVE INTO THE REGION BY SUNDAY INTO MONDAY BRINGING ENHANCED
PRECIPITATION.
AVIATION
WRAP AROUND PRECIPITATION WILL CONTINUE TO IMPACT
NORTHWEST MONTANA THIS MORNING AS SNOW LEVELS HOVER AROUND 5000
FEET. KGPI SHOULD ANTICIPATE STEADY LIGHT RAIN THROUGH AT LEAST
27/12Z, THEN AFTER THAT EXPECTED OFF/ON SHOWERS LIKE THE REMAINDER
OF THE NORTHERN ROCKIES.
MSO WATCHES/WARNINGS/ADVISORIES
MT...NONE.
ID...NONE.
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