887  
FXUS65 KBOI 210303  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
903 PM MDT FRI APR 20 2018  
   
DISCUSSION
 
CLEAR SKIES ASSOCIATED WITH AN UPPER RIDGE WILL  
SHIFT EAST ON SATURDAY AS AN UPPER TROUGH PASSES BY TO OUR NORTH.  
THE TROUGH WILL BRING SOME CLOUDS INTO THE AREA, MAINLY ACROSS THE  
NORTH. THE TROUGH WILL BE ACCOMPANIED BY A WEAK DRY COLD FRONT,  
WHICH WILL BRING A RETURN TO BREEZY NORTHWEST WINDS IN THE  
AFTERNOON. TEMPERATURES WILL BE SLIGHTLY COOLER ACROSS THE NORTH  
DUE TO THE FRONT. NO UPDATES.  
 

 
   
AVIATION
 
VFR UNDER MOSTLY CLEAR SKIES. SURFACE WINDS:  
NORTHWEST 5-15KT THIS EVENING BECOMING LIGHT AFTER SUNSET,  
BECOMING NW 10-20KT WITH HIGHER GUSTS ON SATURDAY AFTERNOON. WINDS  
ALOFT NEAR 10 KFT MSL: WESTERLY 15-25KT.  
 
SUNDAY OUTLOOK...VFR. NORTHWEST SURFACE WINDS 10-20KT DURING  
SUNDAY AFTERNOON, LIGHT WINDS OVERNIGHT. ISOLATED SHOWERS OVER THE  
HIGHER TERRAIN SUNDAY AFTERNOON/EVENING.  
 

 
   
PREV DISCUSSION
 
 
SHORT TERM...TONIGHT THROUGH SUNDAY...GUSTY WINDS REMAIN ACROSS  
THE TREASURE VALLEY AND INTO THE WESTERN MAGIC VALLEY THIS  
AFTERNOON. OTHERWISE, HIGH PRESSURE IS BRINGING WARM AND DRY  
CONDITIONS, WHICH WILL LAST INTO SUNDAY. A DEVELOPING TROUGH WILL  
MOVE THROUGH THE AREA BEGINNING SUNDAY AFTERNOON. MODELS DO SHOW  
SOME INSTABILITY WITH THIS SHOWER DEVELOPMENT, SO OPTED TO INCLUDE  
SOME THUNDERSTORM WORDING FOR IMPACTED AREAS. TEMPERATURES WILL  
REMAIN WARM, GENERALLY AROUND 5 DEGREES ABOVE NORMAL.  
 
LONG TERM...SUNDAY NIGHT THROUGH WEDNESDAY...LINGERING SHOWERS ARE  
EXPECTED SUNDAY NIGHT, MAINLY ACROSS THE HIGHER TERRAIN, AS A QUICK  
MOVING SHORTWAVE TROUGH MOVES EAST. UPON ITS EXIT, AN UPPER LEVEL  
RIDGE WILL BUILD QUICKLY IN ITS STEAD, FOR SUNNY AND WARM  
CONDITIONS. MAXIMUM TEMPERATURES WILL INCREASE TO ABOUT 10-15  
DEGREES ABOVE NORMAL ACROSS THE REGION BY WEDNESDAY.  
 
WEDNESDAY EVENING THROUGH SATURDAY MORNING...SUNNY SKIES AND LIGHT  
WINDS ALOFT AS A RIDGE IS TEMPORARILY IN CONTROL UNTIL FRIDAY  
MORNING. MODELS (THE MOST CURRENT RUNS) AGREE THAT THE RIDGE WILL  
GRADUALLY EXIT EASTWARD AS THE NEXT LOW APPROACHES FROM THE  
SOUTHWEST AND TREKS NORTHEASTWARD ACROSS THE CWA (THE GFS IS MORE  
PROGRESSIVE). EXPECT WIDESPREAD CLOUDINESS AND PRECIPITATION TO  
SPREAD ACROSS THE AREA STARTING LATE FRIDAY AFTERNOON AND CONTINUE  
ON INTO THE OVERNIGHT, SUSTAINED BY AN UPPER LEVEL DISTURBANCE.  
A SLIGHT CHANCE OF THUNDERSTORMS RETURNS FRIDAY AFTERNOON  
STARTING IN SOUTHEASTERN OREGON AND MIGRATING EASTWARD. TEMPERATURES  
EXPECTED TO BE AROUND 10 DEGREES ABOVE NORMAL WILL BE AN  
ADDITIONAL CONTRIBUTING FACTOR TOWARDS THE INTENSITY OF THE LATE  
AFTERNOON CONVECTION.  
 

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

 
 

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