899  
FXUS65 KMSO 202033  
AFDMSO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MISSOULA MT  
233 PM MDT SAT JUL 20 2019  
   
DISCUSSION
 
OTHER THAN A FEW ISOLATED SHOWERS AND THUNDERSTORMS  
ACROSS NORTHWEST MONTANA, THE REST OF WESTERN MONTANA AND NORTH-  
CENTRAL IDAHO WILL REMAIN MOSTLY SUNNY AND WARM. AFTERNOON  
TEMPERATURES WILL BE WARMER TODAY, COMPARED TO THE PAST COUPLE  
DAYS, BUT STILL SLIGHTLY BELOW NORMAL.  
 
THE RIDGE OF HIGH PRESSURE WE'VE BEEN WATCHING THE PAST SEVERAL  
DAYS, WILL BEGIN TO BUILD OVER THE NORTHERN ROCKIES TOMORROW.  
EXPECT TEMPERATURES TO BEGIN INCREASING CLOSER TO NORMAL SUNDAY,  
THEN RISING TO 10 TO 15 DEGREES ABOVE NORMAL BY MONDAY AND  
TUESDAY. EVEN THOUGH WESTERN MONTANA AND NORTH-CENTRAL IDAHO WILL  
BE UNDER THE INFLUENCE OF THE RIDGE. THE REGION WILL BE ON THE  
WESTERN EDGE, ALLOWING FOR A SOUTHWESTERLY FLOW TO DEVELOP AND  
USHER IN MODERATE AMOUNTS OF MOISTURE AND INSTABILITY. THIS WILL  
HELP WITH THE DEVELOPMENT OF THUNDERSTORMS EACH AFTERNOON/EVENING  
MONDAY AND TUESDAY, PARTICULARLY OVER LEMHI COUNTY AND SOUTHWEST  
MONTANA. ELSEWHERE ACROSS WESTERN MONTANA AND NORTH-CENTRAL IDAHO,  
CONVECTION WILL BE MORE ISOLATED IN NATURE. BRIEF HEAVY RAIN AND  
FREQUENT LIGHTNING WILL BE THE MAJOR CONCERNS WITH THESE  
THUNDERSTORMS. THE CONVECTION COULD PERSIST INTO THE OVERNIGHT  
HOURS TUESDAY NIGHT/WEDNESDAY MORNING OVER WEST-CENTRAL AND  
NORTHWEST MONTANA.  
 
LONG RANGE FORECAST MODELS CONTINUE TO SHOW A TROUGH OF LOW  
PRESSURE MOVING ONSHORE OF THE PACIFIC NW BY LATE WEDNESDAY AND  
THURSDAY. THIS WILL HELP PUSH THE RIDGE TO THE EAST, ALLOWING FOR  
TEMPERATURES TO COOL BACK DOWN TO NEAR NORMAL FOR THIS TIME OF  
THE YEAR. WE ALSO EXPECT INCREASING WESTERLY WINDS, AND ISOLATED  
THUNDERSTORMS. HOWEVER, MOST LOCATIONS WILL REMAIN DRY AND BREEZY.  
 

 
   
AVIATION
 
ISOLATED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER  
NORTHWEST MONTANA. THIS WILL DIMINISH AFTER SUNSET THIS EVENING.  
PATCHY VALLEY FOG IS POSSIBLE EARLY SUNDAY FOR NW MONTANA,  
OTHERWISE SKIES WILL BE MOSTLY CLEAR.  
 

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

 
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab MT Page
The Nexlab ID Page Main Text Page