431  
FXUS65 KBOI 280237  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
837 PM MDT SAT MAY 27 2017  
   
DISCUSSION
 
NO CHANGES TO CURRENT FORECAST. RIDGE REMAINS  
OVERHEAD WITH LIGHT WIND. WARMING TEMPERATURES EXPECTED THROUGH  
TUESDAY AHEAD OF THE NEXT APPROACHING WAVE. WEAK INSTABILITY  
ACROSS THE AREA TOMORROW MAY RESULT IN A FEW SHOWERS OVER THE  
BOISE MOUNTAINS SUNDAY AFTERNOON, THOUGH COVERAGE WILL BE  
LIMITED.  
 

 
   
AVIATION
 
VFR UNDER CLEAR SKIES. WINDS, VARIABLE LESS THAN  
10 KTS, UP THROUGH 10 KFT MSL.  
 

 
   
PREV DISCUSSION
 
 
SHORT TERM...TONIGHT THROUGH MONDAY...AN UPPER LEVEL RIDGE AXIS  
WILL DRIFT SLOWLY EASTWARD FROM NEAR THE PACIFIC COAST TO DIRECTLY  
OVERHEAD THROUGH MONDAY. THIS WILL PROVIDE US WITH MOSTLY CLEAR  
SKIES AND WARMING TEMPERATURES. THERE IS SUFFICIENT MOISTURE IN  
THE MOUNTAINS FOR A CHANCE OF SHOWERS OR THUNDERSTORMS EACH  
AFTERNOON/EVENING, WITH THE BETTER CHANCE BEING ON MONDAY. WINDS  
WILL BE LIGHT AND DIURNAL IN NATURE. CHANGES TO THE FORECAST WERE  
MINOR.  
 
LONG TERM...MONDAY NIGHT THROUGH SATURDAY...THE UPPER RIDGE AXIS  
WILL REMAIN NEAR THE AREA THROUGH TUESDAY, BUT THE GFS AND ECMWF  
ARE NOW IN BETTER AGREEMENT ABOUT A TROUGH ARRIVING ON THE COAST  
TUESDAY EVENING. THIS TROUGH IS EXPECTED TO BE A PEELED OFF  
PORTION OF A LARGER LOW ANCHORED OFF THE BRITISH COLUMBIA COAST.  
AS THIS TROUGH MOVES INLAND ON WEDNESDAY AND THURSDAY, THE IMPACT  
IS STILL QUITE UNCLEAR AS THE GFS CONTAINS MUCH MORE MOISTURE AND  
IS DEPICTING MORE SHOWERS AND THUNDERSTORMS THAN THE ECMWF. BOTH  
MODELS CONTINUE TO SHOW SHORTWAVES PASSING BY AS THAT LARGER LOW  
PROGRESSES EASTWARD, BUT AGAIN THE GFS CONTAINS MUCH MORE  
MOISTURE. NONETHELESS, THE FORECAST REMAINS ON THE DRIER SIDE,  
WITH TEMPERATURES WELL ABOVE NORMAL THROUGH WEDNESDAY, THEN ABOUT  
5 DEGREES ABOVE NORMAL THEREAFTER.  
 

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

 
 

 
 
WWW.WEATHER.GOV/BOISE  
WWW.FACEBOOK.COM/NWSBOISE  
WWW.TWITTER.COM/NWSBOISE  
 
DISCUSSION...KB  
AVIATION.....AB  
PREV SHORT TERM...SP  
PREV LONG TERM....EP/WH  
 
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