376  
FXUS65 KMSO 192100  
AFDMSO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MISSOULA MT  
300 PM MDT TUE SEP 19 2017  
   
..SNOW DOWN TO 5000 FEET TONIGHT THROUGH WEDNESDAY MORNING
 
 
   
DISCUSSION
 
 
THE NEXT ROUND OF MOISTURE AND COLD AIR WILL BE IN FULL FORCE OVER  
THE NORTHERN ROCKIES THROUGH WEDNESDAY. SOME INTENSE CONVECTIVE  
SHOWERS OVER SOUTHWEST MONTANA AND NORTH CENTRAL IDAHO WILL PRODUCE  
ISOLATED LIGHTNING STRIKES THROUGH SUNSET THIS EVENING. SNOW LEVELS  
DOWN TO 5000 FEET AT TIMES MAY IMPACT AREA TRAVEL, WITH BRIEF  
HAZARDOUS DRIVING CONDITIONS DEVELOPING OVER HIGH ELEVATION PASSES.  
SEVERAL INCHES SNOW ACCUMULATION ABOVE 5000 FEET MAY BE PARTICULARLY  
IMPACTFUL FOR BACKCOUNTRY TRAVELERS AND HUNTERS.  
 
COOL AND WET CONDITIONS WILL FINISH OUT THE WORK WEEK AS A BROAD  
TROUGH CONTINUES TO BE THE DOMINATE FEATURE OVER THE NORTHERN  
ROCKIES. SNOW LEVELS HOVERING AROUND 6000 FEET WILL ALLOW SNOW TO  
ACCUMULATE AT TIMES ON AREA MOUNTAIN PASSES. SNOW COULD STICK ON  
THE ROADWAYS FOR A SHORT PERIOD OF TIME, BUT SHOULD NOT HAVE A  
SIGNIFICANT IMPACT.  
 
MODEL ENSEMBLES INDICATE THAT THE TROUGH OF LOW PRESSURE WILL BE  
SLOWLY MOVING OFF TO THE EAST THROUGH THE WEEKEND INTO THE FIRST  
PART OF NEXT WEEK. THIS PATTERN CHANGE WILL ALLOW FOR SLIGHT  
WARMING AND GRADUAL REDUCTION IN SHOWER ACTIVITY.  
 

 
   
AVIATION
 
 
WIDESPREAD VALLEY RAIN AND MOUNTAIN SNOW WILL EXIST ACROSS  
NORTHERN ROCKIES AIR SPACE DURING THE NEXT 24 HOURS. CEILINGS AND  
VISIBILITY WILL VARY QUITE A BIT AT MOST TERMINALS DUE TO PASSING  
RAIN SHOWERS. TERRAIN WILL BE MOSTLY OBSCURED ACROSS THE REGION.  
SOME ISOLATED LIGHTNING STRIKES WILL BE PRESENT OVER NORTH  
CENTRAL IDAHO AND SOUTHWEST MONTANA THROUGH 20/0300Z, HOWEVER NO  
LIGHTNING STRIKES ARE ANTICIPATED NEAR ANY NEARBY MAJOR TERMINAL.  
 

 
   
MSO WATCHES/WARNINGS/ADVISORIES
 
 
MT...NONE.  
ID...NONE.  

 
 

 
 
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