460  
FXUS65 KBOI 232041  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
241 PM MDT WED SEP 23 2020  
   
SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT
 
NEXT SYSTEM  
APPROACHING THE PACIFIC NORTHWEST COAST SPREADING CLOUDS AND SMOKE  
ACROSS THE FORECAST AREA THIS AFTERNOON. AS THE FRONT APPROACHES  
TONIGHT, WINDS WILL INCREASE ALONG WITH REDUCED VISIBILITIES IN  
HAZE AND SMOKE. THE FRONT SHOULD MOVE ACROSS THE AREA THURSDAY  
MORNING BRINGING SHOWERS MAINLY TO THE HIGHER ELEVATIONS OF BAKER  
COUNTY INTO THE WEST CENTRAL MOUNTAINS OF IDAHO. BREEZY CONDITIONS  
ARE EXPECTED IN THE WESTERN SNAKE RIVER PLAIN BY THURSDAY  
AFTERNOON AS THE FRONT CONTINUOUS EAST. THIS SHOULD CLEAR OUT THE  
SMOKE INTO THE WEEKEND AS COOL WESTERLY FLOW PREVAILS. ANOTHER  
ROUND OF SHOWERS FOR THE WEST CENTRAL MOUNTAINS IS POSSIBLE FRIDAY  
NIGHT WITH A WEAK SHORTWAVE PASSAGE. TEMPERATURES WILL BE NEAR  
NORMAL THROUGH THE PERIOD.  
   
LONG TERM...SATURDAY THROUGH WEDNESDAY
 
A SHORTWAVE TROUGH PASSING  
BY TO OUR NORTH ON SATURDAY WILL BRING A CHANCE OF SHOWERS MAINLY TO  
THE NORTHERN HALF OF THE FORECAST AREA. TEMPERATURES WILL RUN  
SEVERAL DEGREES BELOW NORMAL WITH BREEZY AFTERNOON WINDS. AS THE  
TROUGH DEPARTS, DRY CONDITIONS WILL RETURN TO THE REGION ON SUNDAY.  
AN UPPER LEVEL RIDGE WILL STRENGTHEN ON SUNDAY OVER CALIFORNIA, WITH  
TEMPERATURES WARMING BACK TO SLIGHTLY ABOVE NORMAL. THE RIDGE WILL  
THEN AMPLIFY EARLY NEXT WEEK, EXTENDING AS FAR NORTH AS NORTHERN  
CANADA BY TUESDAY AND WEDNESDAY. THIS WILL KEEP OUR AREA DRY, WARM,  
AND MOSTLY CLEAR WITH TEMPERATURES WELL ABOVE NORMAL.  
 

 
   
AVIATION
 
MAINLY VFR EXCEPT FOR LOCAL MVFR IN AREAS OF SMOKE. HIGH  
CLOUDS WILL CONTINUE TO MOVE OVERHEAD, WITH MID LEVEL CLOUDS  
INCREASING TONIGHT INTO THURSDAY. A COLD FRONT WILL BRING A CHANCE  
OF RAIN SHOWERS ACROSS BAKER COUNTY AND THE WEST CENTRAL MOUNTAINS  
LATE TONIGHT INTO THURSDAY. SURFACE WINDS: SOUTH TO SOUTHEAST 5-15  
KT WITH GUSTS TO 20 KT, BECOMING NORTHWEST ON THURSDAY. WINDS ALOFT  
NEAR 10KFT MSL: SOUTHWEST 25-40 KT.  
 

 
   
BOI WATCHES/WARNINGS/ADVISORIES
 
 
ID...NONE.  
OR...NONE.  
 

 
 

 
 
WWW.WEATHER.GOV/BOISE  
WWW.FACEBOOK.COM/NWSBOISE  
WWW.TWITTER.COM/NWSBOISE  
 
SHORT TERM...JDS  
LONG TERM....ST  
AVIATION.....ST  
 
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