835  
FXUS65 KBOI 230232  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
832 PM MDT TUE AUG 22 2017  
   
DISCUSSION
 
SMOKE AND HAZE NOW COVER NEARLY ALL OUR CWA AND  
MAY CONTINUE UNTIL EARLY THURSDAY WHEN A PACIFIC COLD FRONT  
COMES THROUGH. ALSO, CONVECTIVE CLOUDS DEVELOPAD AS FAR NORTH  
AS WESTERN HARNEY COUNTY, SOUTHERN-MOST MALHEUR COUNTY, AND  
THE ID/NV BORDER TODAY. CLOUDS WILL DECREASE TONIGHT BUT  
INCREASE AGAIN WEDNESDAY AND FARTHER NORTH THAN TODAY, FOR A  
CHANCE OF THUNDERSTORMS WEDNESDAY AFTERNOON AND NIGHT,  
DECREASING WEST TO EAST THURSDAY. COOLER THURSDAY AND FRIDAY  
BEHIND THE COLD FRONT, THEN STEADILY WARMING AFTER THAT.  
NO UPDATES.  
 

 
   
AVIATION
 
VFR. SMOKE LAYERS, GENERALLY EAST OF KMYL. ISOLATED  
SHOWERS AND THUNDERSTORMS, GENERALLY NEAR THE NV BORDER THIS  
EVENING, ENDING BEFORE MIDNIGHT. MID-HIGH LEVEL CLOUDS INCREASING  
ACROSS THE REGION WEDNESDAY MORNING. ISOLATED SHOWERS AND  
THUNDERSTORMS WEDNESDAY MORNING AND AFTERNOON, SOUTH OF THE SNAKE  
PLAIN AND NORTH THROUGH EASTERN OREGON, BECOMING ISOLATED TO  
SCATTERED AND SPREADING NORTHEAST ACROSS THE CENTRAL IDAHO  
MOUNTAINS BY 24/00Z. SURFACE WINDS: VARIABLE 10 KTS OR LESS,  
EXCEPT GUSTY OUTFLOW WINDS UP TO 40 KTS NEAR THUNDERSTORMS.  
WINDS ALOFT NEAR 10 KFT MSL: VARIABLE 5-15 KTS.  
 
   
PREV DISCUSSION
 
 
SHORT TERM...TONIGHT THROUGH THURSDAY...SHOWER ACTIVITY OBSERVED  
ACROSS NEVADA THIS AFTERNOON CONTINUES TO MOVE NORTHWARD, WITH SOME  
RADAR REFLECTIVITY NOTED ACROSS EXTREME SOUTHERN IDAHO. INSTABILITY  
OVER THE AREA WILL LEAVE THE POTENTIAL FOR FURTHER SHOWER AND  
THUNDERSTORM DEVELOPMENT THIS AFTERNOON, THOUGH COVERAGE SHOULD BE  
LIMITED. HAZY CONDITIONS WILL ALSO PERSIST, WITH SATELLITE SHOWING  
SMOKE REACHING FURTHER INTO TREASURE VALLEY THIS AFTERNOON. SHOWERS  
AND THUNDERSTORMS WILL REMAIN OVER THE AREA ON WEDNESDAY AS  
ADDITIONAL SOUTHWEST FLOW DEVELOPS, WITH THE BEST SHOWER COVERAGE  
ANTICIPATED TO OCCUR DURING THE LATE AFTERNOON/EVENING HOURS. MODELS  
IN FAIR AGREEMENT REGARDING THE PATH OF THE NEXT APPROACHING AREA OF  
LOW PRESSURE. THE LOW MOVES SOUTH OUT OF THE GULF OF ALASKA LATE  
WEDNESDAY SHIFTING TO A MORE EASTERLY MOVEMENT BY THURSDAY MORNING.  
AS THIS SYSTEM PROGRESSES ACROSS CANADA, IT WILL SEND A COLD FRONT  
ACROSS THE PACIFIC NORTHWEST, HELPING TO COOL TEMPERATURES TO NEAR-  
NORMAL VALUES FOR THURSDAY. UNSETTLED CONDITIONS TO CONTINUE ACROSS  
THE AREA WITH MODELS IN DECENT AGREEMENT ON INSTABILITY AND  
MOISTURE.  
 
LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...SMOKY CONDITIONS  
ARE EXPECTED FRIDAY INTO SATURDAY AS WINDS ALOFT BRING SMOKE FROM  
CENTRAL OREGON UNDER WEAK AND DRY WESTERLY FLOW. UPPER LEVEL RIDGING  
IS EXPECTED TO BUILD ACROSS THE WEST ON SUNDAY, BRINGING ABOVE  
NORMAL TEMPERATURES AND DRY CONDITIONS THROUGH THE REMAINDER OF THE  
PERIOD. TEMPERATURES EXPECTED TO BE AROUND 10-15 DEGREES ABOVE  
NORMAL UNDER THIS RIDGE AND JUST UNDER RECORDS.  
 

 
   
BOI WATCHES/WARNINGS/ADVISORIES
 
 
ID...RED FLAG WARNING FROM 3 PM WEDNESDAY TO 3 AM MDT THURSDAY  
IDZ400>403-421-423-426.  
OR...RED FLAG WARNING FROM 3 PM MDT /2 PM PDT/ WEDNESDAY TO 3 AM MDT  
/2 AM PDT/ THURSDAY ORZ636-637-646.  
 

 
 

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