699  
FXUS65 KBOI 230249  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
849 PM MDT FRI SEP 22 2017  
   
DISCUSSION
 
ISOLATED SHOWERS ASSOCIATED WITH AN UPPER TROUGH  
WILL GRADUALLY DIMINISH OVERNIGHT. THE TROUGH WILL SLOWLY MOVE  
EAST THROUGH SATURDAY. DRIER NORTHERLY FLOW BEHIND THE TROUGH WILL  
END THE SHOWERS IN SE OREGON AND MOST OF SW IDAHO ON SATURDAY,  
EXCEPT RESIDUAL MOISTURE WILL RESULT IN A SLIGHT CHANCE OF SHOWERS  
IN THE WEST CENTRAL/BOISE MOUNTAINS. AFTER A CHILLY DAY TODAY,  
TEMPERATURES WILL BE 4-8 DEGREES WARMER (BUT STILL WELL BELOW  
NORMAL) IN MOST LOCATIONS ON SATURDAY. NO UPDATES.  
 

 
   
AVIATION
 
MOSTLY VFR. ISOLATED SHOWERS NEAR KMYL CAUSING MVFR  
CONDITIONS. THESE SHOWERS WILL BE DYING OFF WITHIN THE NEXT COUPLE  
OF HOURS. SURFACE WINDS, WEST-NORTHWEST AND LIGHT. WINDS ALOFT TO  
10K FEET MSL, NORTHERLY 10-15 KTS.  
 
WEEKEND OUTLOOK: ISOLATED SHOWERS IN THE WEST CENTRAL AND BOISE  
MOUNTAINS SATURDAY AFTERNOON AND INTO THE EVENING. DRY CONDITIONS  
FOR SUNDAY. SURFACE WINDS, GENERALLY LIGHT AND NORTHERLY.  
 

 
   
PREV DISCUSSION
 
 
SHORT TERM...TONIGHT THROUGH SUNDAY...SHOWERS ACROSS THE AREA  
WILL CONTINUE THIS AFTERNOON, THOUGH COVERAGE WILL WEAKEN. THE  
AREA OF LOW PRESSURE WILL MOVE EASTWARD THROUGH THE EVENING,  
LEAVING MOSTLY HIGHER TERRAIN RAIN AND SNOW SHOWERS BY SATURDAY  
AFTERNOON/EVENING. THE EXIT OF THIS AREA OF LOW PRESSURE WILL  
ALLOW A BUILDING NORTHERLY FLOW ACROSS THE AREA. DRY CONDITIONS  
EXPECTED ON SUNDAY WITH TEMPERATURES WARMING TO WITHIN 10 DEGREES  
OF NORMAL.  
 
LONG TERM...SUNDAY NIGHT THROUGH FRIDAY...AN UPPER RIDGE WILL  
CONTINUE TO BUILD OFF THE COAST, KEEPING OUR AREA IN A NORTHERLY  
FLOW THROUGH LATE TUESDAY. A FEW SHORTWAVES SLIDING SOUTH ALONG  
THE DIVIDE MAY BRING LITTLE MORE THAN CLOUD COVER TO THE MOUNTAINS  
OF IDAHO. ALSO, DESPITE BEING IN A NORTHERLY FLOW, HIGH  
TEMPERATURES WILL CONTINUE THEIR INCREASING TREND OF A FEW DEGREES  
EACH DAY. FOR WEDNESDAY AND BEYOND, THE RIDGE MOVES MORE OVERHEAD  
WHICH WILL CONTINUE TO INCREASE TEMPERATURES TO CLOSER TO NORMAL  
AND KEEP CONDITIONS DRY.  
 

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

 
 

 
 
WWW.WEATHER.GOV/BOISE  
WWW.FACEBOOK.COM/NWSBOISE  
WWW.TWITTER.COM/NWSBOISE  
 
DISCUSSION...BW  
AVIATION.....JC  
PREV SHORT TERM...KB  
PREV LONG TERM....EP  
 
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