Weather Service Report


554 
FXUS65 KMSO 202024
AFDMSO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
224 PM MDT MON OCT 20 2014

...VERY WET MOUNTAIN SNOW TOMORROW...

.DISCUSSION...A VERY WET SYSTEM WITH A COLD FRONT WILL IMPACT
THE NORTHERN ROCKIES. EXPECT SNOW LEVELS TO FALL QUICKLY BEHIND
THE FRONT, STARTING DURING THE MORNING IN CENTRAL IDAHO. THE FRONT
WILL MOVE THROUGH WESTERN MONTANA IN THE LATE MORNING AND EARLY
AFTERNOON. SNOW LEVELS WILL DROP TO AROUND 5,000 FEET IN THE
AFTERNOON.

WARM ROADS WILL HELP MELT THE SNOW ON MOST AREA ROADS, ESPECIALLY
DURING THE AFTERNOON WHEN THE SUN IS STILL UP. HOWEVER, DURING
PERIODS OF HEAVIER SNOW, SOME SLUSHY ACCUMULATION ON THE ROADS IS
LIKELY. 

A BIGGER IMPACT WILL LIKELY BE IN THE BACKCOUNTRY WITH LATE
SEASON HIKERS AND HUNTERS. EVEN BEFORE IT STARTS SNOWING, THIS
WILL BE A VERY WET SYSTEM WITH TEMPERATURES IN THE 30S AND 40S IN
THE MOUNTAINS. THEN ONCE IT STARTS SNOWING IT WILL BE A VERY WET,
COLD, AND MISERABLE DAY IN THE BACKCOUNTRY.

THE CURRENT SCENARIO HAS THE STRONGEST MOISTURE FEED INTO CENTRAL
IDAHO AND THE BITTERROOT MOUNTAINS, THEN ACROSS THE BITTERROOT
VALLEY INTO THE SAPPHIRE MOUNTAINS. GEORGETOWN LAKE AND THE
MOUNTAINS AROUND ANACONDA AND BUTTE WILL ALSO LIKELY SEE
SIGNIFICANT SNOW.

ANOTHER DISTURBANCE WILL ENTER THE REGION ON THURSDAY, BRINGING
ADDITIONAL RAINFALL AND KEEPING TEMPERATURES COOL. MOUNTAIN
RIDGES COULD SEE BREEZY SOUTHWESTERLY FLOW AS THE SCATTERED
SHOWERY PATTERN CONTINUES THROUGH THE EARLY WEEKEND. A BRIEF LULL
IN PRECIPITATION IS POSSIBLE SATURDAY BEFORE THE NEXT SYSTEM MOVES
IN SUNDAY INTO EARLY NEXT WEEK. THIS SYSTEM WILL BE COOLER AND
BREEZY, AND COULD BRING RAIN AND SNOW SHOWERS WITH LOWERING SNOW
LEVELS.

&&

.AVIATION...FEW IMPACTS FOR AVIATION THIS AFTERNOON AND EVENING
WITH INCREASING CLOUDS AHEAD OF AN APPROACHING COLD FRONT. AFTER
06Z, EXPECT INCREASING MOUNTAIN OBSCURATIONS DUE TO THE
APPROACHING SYSTEM. TOMORROW WILL SEE RAIN START TO FALL IN THE
MORNING ACROSS MUCH OF CENTRAL IDAHO AND AFTERNOON IN WESTERN
MONTANA. EXPECT SHOWERS TO TURN TO SNOW BEHIND THE COLD FRONT
TOMORROW.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...WINTER WEATHER ADVISORY FROM NOON TUESDAY TO 6 AM MDT WEDNESDAY 
     ABOVE 6000 FEET FOR THE BUTTE/BLACKFOOT REGION.

     WINTER WEATHER ADVISORY FROM 6 AM TUESDAY TO 6 AM MDT WEDNESDAY 
     ABOVE 5000 FEET FOR THE BITTERROOT/SAPPHIRE MOUNTAINS.

ID...WINTER WEATHER ADVISORY FROM 5 AM TUESDAY TO 5 AM PDT WEDNESDAY 
     ABOVE 5000 FEET FOR THE SOUTHERN CLEARWATER MOUNTAINS.

     WINTER WEATHER ADVISORY FROM 6 AM TUESDAY TO 6 AM MDT WEDNESDAY 
     FOR LOLO PASS AND LOST TRAIL PASS IN THE EASTERN LEMHI 
     COUNTY.

&&

$$

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