105  
FXUS65 KBOI 081539  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
939 AM MDT WED OCT 8 2025  
   
DISCUSSION  
UNSEASONABLY WARM CONDITIONS ARE EXPECTED TODAY  
AND THURSDAY, WITH TEMPERATURES RUNNING ABOUT 10 TO 12 DEGREES  
ABOVE NORMAL. INCREASING SOUTHWESTERLY FLOW ALOFT, IN RESPONSE  
TO A DEVELOPING LOW-PRESSURE SYSTEM OFF THE PACIFIC NORTHWEST  
COAST, SHOULD HELP BOOST SURFACE WINDS FROM THE SOUTH-SOUTHEAST  
TODAY. THIS FLOW REGIME WILL AID HIGH TEMPERATURES IN REACHING  
THE UPPER 70S TODAY AND THE LOW 80S ON THURSDAY, WHILE  
MAINTAINING MILD LOW TEMPERATURES OVERNIGHT. CLOUDS WILL  
INCREASE LATER ON THURSDAY, AND THE THREAT FOR SHOWERS WILL  
BEGIN ON FRIDAY WITH THE PASSAGE OF A COLD FRONT. UNTIL THEN,  
EXPECT EARLY FALL-LIKE CONDITIONS ACROSS THE FORECAST AREA. NO  
UPDATES ARE NEEDED AT THIS TIME.  
 
 
   
AVIATION  
MOSTLY VFR. MVFR/IFR IN SHELTERED MTN VALLEYS WITH  
FOG/LOW STRATUS. CLEARING TO VFR BY 17Z. LLWS DEVELOPING EARLY THU  
MORNING. SURFACE WINDS: E-SE 5-15 KT WITH GUSTS TO 25 KT IN THE  
SNAKE PLAIN. WINDS ALOFT AT 10KFT MSL: SW 15-25 KT  
 
KBOI...VFR AND CLEAR. LLWS POSSIBLE EARLY THU MORNING. SURFACE  
WINDS: SE 10-15 KT WITH GUSTS UP TO 25 KT THIS AFTERNOON.  
 
 
   
PREV DISCUSSION  
 
SHORT TERM...TODAY THROUGH FRIDAY NIGHT...AN UPPER LEVEL  
TROUGH NEAR HAIDA GWAII WILL GRADUALLY MOVE SOUTH ALONG THE  
COAST THROUGH THURSDAY, SHIFTING THE FLOW ALOFT TO THE SOUTHWEST  
AND BRINGING WARMER TEMPERATURES TO THE REGION. SOUTHWEST-  
SOUTHEAST WINDS AND WILL GRADUALLY INCREASE THROUGH FRIDAY AHEAD  
OF THE COLD FRONT. TEMPERATURES WEDNESDAY WARM AROUND 5 DEGREES  
AND A FEW MORE DEGREES BY THURSDAY. AS THE SYSTEM MOVES SOUTH  
ALONG THE COAST, HIGH CLOUDS INCREASE ACROSS CENTRAL OR.  
THURSDAY IS LIKELY THE WARMEST DAY OF THE PERIOD FOR EASTERN OR  
WHILE FRIDAY IS FORECAST TO BE THE WARMEST DAY OF THE PERIOD FOR  
SOUTHWEST IDAHO. THE TROUGH BECOMES A CLOSED LOW AND REMAINS  
OFF THE OR COAST, WITH A DRY SLOT DEVELOPING OVER SOUTHEAST OR  
AND SOUTHWEST ID FOR MUCH OF THE DAY FRIDAY BEFORE A COLD FRONT  
ARRIVES FRIDAY EVENING. SHOWERS CHANCES INCREASE TO 20-40  
PERCENT LATE IN THE EVENING. WITH PRONOUNCED SOUTHWEST  
FLOW CONTINUING, FAVORED AREAS FOR UPSLOPE FLOW WILL RECEIVE  
THE BRUNT OF THE MOISTURE, SUCH AS THE WEST-CENTRAL IDAHO AND  
BOISE MOUNTAINS (60-80% CHANCE).  
 
LONG TERM...SATURDAY THROUGH WEDNESDAY...THE TROUGH MOVES  
INLAND BY SATURDAY, WITH SHOWERS INCREASING TO 40 PERCENT IN  
THE VALLEYS AND CONTINUED 60-80 PERCENT IN THE MOUNTAINS. WINDS  
BECOME WEST-NORTHWEST ON SATURDAY AFTERNOON WITH GUSTS TO 20 TO  
30 MPH DURING THE AFTERNOON BEHIND THE FRONT. FORECAST  
CONFIDENCE BEYOND SUNDAY IS LOW, BUT FAVORS MUCH COOLER AND  
UNSETTLED EARLY NEXT WEEK WITH A TROUGH SOMEWHERE OVER THE  
PACIFIC NORTHWEST. FORECAST MODELS CONTINUE TO STRUGGLE WITH  
CURRENT AND RECENT TROPICAL SYSTEMS DISRUPTING AND ENHANCING THE  
JET STREAM, PARTICULARLY IN THE EASTERN PACIFIC NEAR CABO SAN  
LUCAS AND IN THE WESTERN PACIFIC OCEAN. TEMPERATURES COOL 10-20  
DEGREES ON SATURDAY AND ANOTHER 5-10 DEGREES ON SUNDAY.  
 
 
   
BOI WATCHES/WARNINGS/ADVISORIES  
 
ID...NONE.  
OR...NONE.  
 
 
 
 
 
WWW.WEATHER.GOV/BOISE  
 
INTERACT WITH US VIA SOCIAL MEDIA:  
WWW.FACEBOOK.COM/NWSBOISE  
WWW.X.COM/NWSBOISE  
 
DISCUSSION...JDS  
AVIATION.....NF  
SHORT TERM...KA  
LONG TERM....KA  
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