325
FXUS65 KMSO 251847
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
1247 PM MDT SUN OCT 25 2026
DISCUSSION
KEY MESSAGES:
- HIGH PRESSURE BREAKS DOWN EARLY MONDAY.
- COLDER TEMPERATURES AND PERIODS OF RAIN AND MOUNTAIN SNOW
EXPECTED THIS WEEK.
A WEAK RIDGE OF HIGH PRESSURE OVER THE NORTHERN ROCKIES WILL MAINTAIN DRY
CONDITIONS AND SEASONAL TEMPERATURES THROUGH THIS AFTERNOON. PATCHY FOG IS
POSSIBLE MONDAY MORNING, BUT IT IS NOT EXPECTED TO BE AS DENSE OR
WIDESPREAD AS SUNDAY MORNING'S FOG.
A LOW PRESSURE SYSTEM WILL MOVE INTO THE PACIFIC NORTHWEST ON MONDAY. RAIN
AND MOUNTAIN SNOW FROM THIS SYSTEM WILL REACH NORTH-CENTRAL IDAHO BY EARLY
MONDAY AFTERNOON, SPREADING ACROSS THE REST OF THE REGION OVERNIGHT. A
SECOND STORM SYSTEM WILL MOVE ALONG THE COAST BY MID-WEEK, ESTABLISHING A
LARGE AREA OF LOW PRESSURE OVER THE WESTERN UNITED STATES. ANOTHER STRONG
LOW PRESSURE SYSTEM MAY ARRIVE LATE IN THE WEEK, BUT WEATHER FORECAST
MODELS CURRENTLY DISAGREE ON THE EXACT TRACK AND IMPACTS FOR THE NORTHERN
ROCKIES.
EXPECT TEMPERATURES TO RUN ABOUT 5 DEGREES BELOW SEASONAL AVERAGES THIS
WEEK, ALONG WITH PERIODIC RAIN AND SNOW. SNOW LEVELS WILL HOVER BETWEEN
4,000 AND 5,000 FEET, BRINGING ACCUMULATING SNOW TO THE HIGHER TERRAIN AND
MOUNTAIN PASSES, ESPECIALLY AT NIGHT.
AVIATION
A WEAK RIDGE OF HIGH PRESSURE WILL REMAIN OVER THE REGION
TODAY. HIGH-LEVEL CLOUDS WILL INCREASE LATER TODAY AS A LOW PRESSURE SYSTEM
APPROACHES THE REGION. DUE TO INCREASED CLOUD COVER TONIGHT AND LIGHT
WINDS, WIDESPREAD FOG WILL NOT HAVE THE SAME LEVEL OF IMPACT ON MONDAY
MORNING.
MSO WATCHES/WARNINGS/ADVISORIES
MT...NONE.
ID...NONE.
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