696  
FXUS65 KBOI 220243  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
843 PM MDT TUE MAY 21 2019  
   
DISCUSSION
 
ISOLATED SHOWERS AND THUNDERSTORMS REMAIN SPREAD  
ACROSS THE AREA THIS EVENING, BUT HAVE SHOWN SIGNS OF DECREASING  
AS WE APPROACH SUNSET. THESE WILL NOT DIMINISH COMPLETELY  
OVERNIGHT DUE TO THE INFLUENCE OF A LARGE UPPER LEVEL LOW TO OUR  
SOUTH. THIS IS COVERED WELL BY THE CURRENT FORECAST, AND NO  
CHANGES ARE PLANNED AT THIS TIME.  
 

 
   
AVIATION
 
AREAS OF MVFR AND MOUNTAIN OBSCURATION IN CLOUDS AND  
SHOWERS. SURFACE WINDS MAINLY NW 10 KTS OR LESS, BECOMING N 10-20  
KTS AFTER 18Z WEDNESDAY. WINDS ALOFT AT 10K FT MSL N-NE 10-20 KTS.  
 

 
   
PREV DISCUSSION
 
 
SHORT TERM...TONIGHT THROUGH FRIDAY...THE UPPER LOW SPINNING OFF  
THE OREGON COASTLINE WILL CONTINUE TO BRING RAIN TO THE AREA FOR  
THE REMAINDER OF THE AFTERNOON AND EVENING. ISOLATED THUNDERSTORMS  
ARE EXPECTED AGAIN THIS AFTERNOON. THIS LOW TRACKS TO OUR SOUTH  
WITH PRECIPITATION BEGINNING TO TAPER OFF EVER SO SLIGHTLY FOR  
MUCH OF OUR AREA OVER THE NEXT FEW DAYS. FRIDAY MORNING WILL BE  
THE DRIEST IN THE NEAR TERM AS WE SIT IN-BETWEEN SYSTEMS. ANOTHER  
LOW DROPS DOWN INTO SOUTHERN WASHINGTON BY THE AFTERNOON BRINGING  
WITH IT INCREASING PRECIPITATION. TEMPERATURES WILL REMAIN BELOW  
NORMAL, BUT DO RISE THROUGHOUT THE FORECAST.  
 
LONG TERM...SATURDAY NIGHT THROUGH TUESDAY...UPPER LEVEL LOW  
ALONG THE CALIFORNIA COAST SATURDAY WILL MOVE TO ARIZONA MONDAY,  
THEN ACCELERATE NORTHEAST INTO COLORADO TUESDAY. THE LOW WILL  
PASS CLOSE ENOUGH TO CONTINUE SHOWERS AND AFTERNOON THUNDERSTORMS  
IN THE SOUTHERN ZONES OF OUR CWA. DRYING IS EXPECTED TUESDAY FROM  
WEST TO EAST. MEANWHILE, MODELS SHOW A GRADUAL WARMING TREND  
THROUGH THE PERIOD WITH TEMPS FINALLY WARMING TO NORMAL BY TUESDAY.  
MODELS ALSO SHOW ENOUGH INSTABILITY FOR A SLIGHT CHANCE OF  
AFTERNOON THUNDERSTORMS SATURDAY THROUGH MONDAY, WHILE TUESDAY  
LOOKS MORE STABLE. THE SNOW LEVEL WILL BE NEAR 8500 FEET MSL FRIDAY  
NIGHT THEN RISE TO 9000 FEET SATURDAY AND BEYOND, SO SNOW WILL NOT  
BE A CONCERN. SNOWMELT AND RUNOFF INTO AREA RIVERS WILL LIKELY  
INCREASE BUT NOT UNTIL AFTER TUESDAY.  
 

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

 
 

 
 
WWW.WEATHER.GOV/BOISE  
WWW.FACEBOOK.COM/NWSBOISE  
WWW.TWITTER.COM/NWSBOISE  
 
DISCUSSION...SP  
AVIATION.....JT  
PREV SHORT TERM...JC  
PREV LONG TERM....LC  
 
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