297  
FXUS65 KMSO 222058  
AFDMSO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MISSOULA MT  
258 PM MDT FRI SEP 22 2017  
   
DISCUSSION
 
A LARGE, COLD AND MOIST LOW PRESSURE AREA CONTINUES  
TO SPIN OVER THE NORTHERN ROCKY MOUNTAIN REGION THIS AFTERNOON.  
THE CORE OF THE SYSTEM WILL SETTLE INTO THE GREAT BASIN BY  
SATURDAY WITH DECREASING PRECIPITATION AND CLOUD COVER BY EARLY  
SATURDAY. THE CLEARING SKIES WILL RESULT IN FOG FOR LATE FRIDAY  
NIGHT THROUGH MID-MORNING SATURDAY, IN MANY VALLEY LOCATIONS.  
DRYING CONDITIONS SATURDAY AFTERNOON AND OVERNIGHT WILL LEAD TO A  
CHILLY NIGHT AND A WIDESPREAD FROST AND FREEZE BY SUNDAY MORNING.  
 
A GRADUAL WARMING AND DRYING TREND IS EXPECTED NEXT WEEK WITH  
HIGHS NEAR 70 DEGREES EXPECTED BY THURSDAY OR FRIDAY. THE ONE  
EXCEPTION IS ON TUESDAY, WHEN A WEAK DISTURBANCE MOVES THROUGH THE  
DEVELOPING RIDGE OF HIGH PRESSURE AND MAY BRING A FEW LIGHT  
SHOWERS TO WESTERN MONTANA.  
 

 
   
AVIATION
 
LOW CEILING AND VISIBILITY CONDITIONS, PARTICULARLY  
FOR KMSO AND KBTM, WILL SLOWLY IMPROVE THROUGH THE EVENING. WITH  
PARTIAL CLEARING OVERNIGHT, THERE IS A RISK OF LOCAL FOG IMPACTING  
TERMINALS AND AREA VALLEYS AFTER 23/06Z.  
 

 
   
MSO WATCHES/WARNINGS/ADVISORIES
 
 
MT...WINTER WEATHER ADVISORY UNTIL MIDNIGHT MDT TONIGHT ABOVE 5000  
FEET FOR THE BITTERROOT/SAPPHIRE MOUNTAINS...  
BUTTE/BLACKFOOT REGION.  
 
ID...WINTER WEATHER ADVISORY UNTIL MIDNIGHT MDT TONIGHT ABOVE 5500  
FEET FOR THE EASTERN LEMHI COUNTY...WESTERN LEMHI COUNTY.  
 

 
 

 
 
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