945  
FXUS65 KBOI 081547  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
947 AM MDT TUE JUL 8 2025  
   
DISCUSSION  
UPPER-LEVEL RIDGING WILL CAUSE THE HEAT TO PEAK  
TODAY, WITH THE TREASURE VALLEY EXPERIENCING THE HOTTEST  
TEMPERATURES, RANGING FROM 100 TO 105 DEGREES. CONSEQUENTLY, THE  
HEAT ADVISORY REMAINS IN EFFECT. MID-LEVEL MOISTURE FROM  
YESTERDAY'S SHOWER AND THUNDERSTORM DEVELOPMENT IN CENTRAL  
OREGON WILL MOVE NORTHEAST, BRINGING A 15-20% CHANCE OF  
THUNDERSTORMS TO SOUTHEAST OREGON AND THE WEST-CENTRAL IDAHO  
MOUNTAINS. DUE TO MARGINAL CONDITIONS AND WEAK SHEAR, EXPECT  
SMALL, SHORT-LIVED STORMS WITH LITTLE RAINFALL. LOCAL WIND GUSTS  
UP TO 45 MPH ARE POSSIBLE FROM THESE STORMS.  
 
GREATER THUNDERSTORMS POTENTIAL FOR WEDNESDAY ACROSS MUCH OF THE  
AREA THOUGH THERE ARE QUITE LARGE DIFFERENCES IN THE HIGH-RES  
MODELS ON LOCATION OF CONVECTIVE DEVELOPMENT. THIS WILL BE  
FURTHER ADDRESSED IN THE AFTERNOON PACKAGE. NO UPDATES NEEDED AT  
THIS TIME.  
 
 
   
AVIATION  
VFR UNDER MOSTLY CLEAR SKIES. ISOLATED SHOWERS AND  
THUNDERSTORMS THIS AFTERNOON ACROSS SE OREGON AND THE WEST-CENTRAL  
IDAHO MOUNTAINS. GUSTS UP TO 45 KT NEAR THUNDERSTORMS. HIGH DENSITY  
ALTITUDE DUE TO HOT TEMPERATURES. SURFACE WINDS: VARIABLE LESS THAN  
10 KT, BECOMING SE-SW 5-15 KT THIS AFTERNOON. WINDS ALOFT AT 10KFT  
MSL: SE-SW 5-15 KT.  
 
KBOI...VFR. HIGH DENSITY ALTITUDE DUE TO HOT TEMPERATURES. SURFACE  
WINDS: VARIABLE LESS THAN 10 KT.  
 
 
   
PREV DISCUSSION  
 
SHORT TERM...TODAY THROUGH THURSDAY NIGHT...THE HEAT PEAKS  
TODAY IN RESPONSE TO UPPER LEVEL RIDGING OVER THE AREA. THE  
TREASURE VALLEY WILL SEE THE HOTTEST TEMPERATURES AND THE HEAT  
ADVISORY REMAINS IN PLACE TO COVER HIGHS OF 100 TO 105. AND  
THE MID-LEVEL MOISTURE RESPONSIBLE FOR SHOWER/THUNDERSTORM  
DEVELOPMENT OVER CENTRAL OREGON YESTERDAY, WILL SPREAD TO THE  
NORTH AND EAST TODAY BRINGING A 15-20% CHANCE OF THUNDERSTORMS  
TO SE OREGON AND THE W-CENTRAL IDAHO MTNS. EXPECT SMALL AND  
SHORT-LIVED DEVELOPMENT GIVEN THE MARGINAL CONDITIONS AND WEAK  
SHEAR ENVIRONMENT. LOCAL WIND GUSTS TO 45 MPH ARE POSSIBLE FROM  
SHOWERS/STORMS THAT DEVELOP WITH LITTLE RAINFALL EXPECTED.  
 
A CLOSED LOW ALONG THE CA COAST WILL LIFT THROUGH SE OREGON AND  
SW IDAHO ON WEDNESDAY. SLIGHT COOLING ALOFT AND INCREASED CLOUD  
COVER WILL TAKE 5-8 DEGREES OFF OF TODAY'S HIGHS. THE UPPER  
TROUGH PASSAGE WILL INCREASE THUNDERSTORM CHANCES ACROSS THE  
REGION. FORECAST STAYS WITH A SLIGHT CHANCE (15-20%), BUT THE  
POTENTIAL FOR GREATER COVERAGE EXISTS ACROSS SE OREGON AND AREAS  
OF SW IDAHO (BOISE MTNS TO THE ID/NV BORDER) WHERE THE DYNAMICS  
AND ENVIRONMENT ARE LOOKING MORE FAVORABLE. GUSTY OUTFLOW WINDS  
OF 35 TO 55 MPH WILL BE POSSIBLE AND COULD IMPACTS SITES WELL  
AWAY FROM THE STORMS. ACTIVITY WILL DIMINISH EARLY IN THE NIGHT  
AS THE UPPER LOW TRACKS EASTWARD. THURSDAY IS DRY AND COOLER  
WITH HIGH TEMPERATURES AROUND 5 DEGREES BELOW NORMAL. WINDS WILL  
BE BREEZY, WITH GUSTS OF 25-35 MPH IN THE SNAKE PLAIN EAST OF  
BOISE.  
 
LONG TERM...FRIDAY THROUGH TUESDAY...A STRONG HIGH PRESSURE  
CENTER OFF THE COAST OF SOUTHERN CALIFORNIA IS EXPECTED TO  
BUILD INTO THE AREA THROUGH FRIDAY AND THE WEEKEND, RETURNING A  
WARMING AND DRYING TREND. VALLEY DAYTIME TEMPERATURES ARE  
EXPECTED TO CLIMB BACK INTO THE LOWER 90S ON FRIDAY, MID 90S  
SATURDAY, AND UPPER 90S SUNDAY THROUGH TUESDAY. MONDAY AND  
TUESDAY WILL GENERALLY SEE A TROUGH FROM BRITISH COLUMBIA DIG  
INTO THE AREA, WITH CONSIDERABLE GUIDANCE UNCERTAINTY OVER ITS  
INTERACTION WITH ANOTHER TROUGH OVER THE OREGON/CALIFORNIA  
COAST. NORTHWESTERLY FLOW WOULD BE EXPECTED TUESDAY, AND  
ISOLATED SHOWERS/THUNDERSTORMS OVER HIGHER ELEVATIONS CANNOT BE  
RULED OUT.  
 
 
   
BOI WATCHES/WARNINGS/ADVISORIES  
 
ID...HEAT ADVISORY UNTIL 9 PM MDT THIS EVENING IDZ012-014.  
OR...HEAT ADVISORY UNTIL 9 PM MDT /8 PM PDT/ THIS EVENING ORZ064.  
FIRE WEATHER WATCH FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY  
EVENING ORZ670-672>674.  
 
 
 
 
 
WWW.WEATHER.GOV/BOISE  
 
INTERACT WITH US VIA SOCIAL MEDIA:  
WWW.FACEBOOK.COM/NWSBOISE  
WWW.X.COM/NWSBOISE  
 
DISCUSSION...JDS  
AVIATION.....BW  
SHORT TERM...DG  
LONG TERM....JY  
CLICK HERE TO GO TO PREVIOUS BULLETINS.
The Nexlab ID Page
The Nexlab OR Page
Main Text Page