275
FXUS65 KBOI 091113
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
513 AM MDT THU JUL 9 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- HOT AND DRY, WITH BREEZY AFTERNOON WINDS THROUGH THE WEEKEND.
- SHOWER AND THUNDERSTORM CHANCES RETURN EARLY NEXT WEEK WITH
THE ARRIVAL OF MONSOON MOISTURE.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 324 AM MDT THU JUL 9 2026
A FEW DEGREES OF COOLING WITH NORTHWEST SURFACE WINDS ARE
EXPECTED TODAY BEHIND WEDNESDAY'S WEAK COLD FRONT. HI-RES MODELS
INDICATE STORM ACTIVITY THIS AFTERNOON SHOULD REMAIN SOUTH OF
THE IDAHO BORDER AND EAST OF BANNER SUMMIT IN CENTRAL IDAHO, BUT
OUTFLOWS UP TO 40 MPH MAY TRAVEL INTO THE SW IDAHO HIGHLANDS
THIS EVENING. BEGINNING FRIDAY, HIGH PRESSURE ACROSS THE DESERT
SOUTHWEST IS FORECAST TO BUILD NORTH INTO THE N ROCKIES,
INTRODUCING A RAPID ONSET OF HEAT AS SOUTH-SOUTHWEST FLOW
DEVELOPS OVER THE FORECAST AREA. THIS FLOW WILL GENERATE BREEZY
SOUTHWEST SURFACE WINDS ACROSS MUCH OF SE OREGON AND THE
MOUNTAINS OF SW IDAHO FRIDAY AFTERNOON. LATEST MODEL GUIDANCE
PLACES LOWER VALLEY TEMPERATURES AROUND 100 DEGREES, WITH
MOUNTAIN VALLEYS IN THE 80S/90S. TEMPERATURES WILL REMAIN HOT ON
SATURDAY, WITH LOWER VALLEYS PEAKING IN THE UPPER 90S TO 105
DEGREES. OVERNIGHT/MORNING TEMPERATURES WILL ALSO REMAIN WARMER
THAN NORMAL, REDUCING THE OPPORTUNITY FOR HEAT-RELIEF AND
INCREASING HEAT RISK ACROSS THE SNAKE PLAIN AND SOUTH TO THE NV
BORDER ON SATURDAY.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 324 AM MDT THU JUL 9 2026
SLIGHT COOLING IS ANTICIPATED FROM WEST TO EAST ON SUNDAY AS A
PACIFIC TROUGH APPROACHES THE PNW COAST. TEMPERATURES WILL STILL
REMAIN HOT, HOWEVER, AS DEEP SOUTH-SOUTHWEST FLOW PERSISTS FROM
THE RIDGE DOMINATING TO THE EAST. CLOUD COVERAGE IS FORECAST TO
INCREASE SUNDAY AND MONDAY AS MID/HIGH LEVEL MONSOON MOISTURE
MAKES ITS WAY NORTH INTO THE REGION. PRECIPITABLE WATER VALUES
WILL BEGIN TO RAMP UP SIGNIFICANTLY BY LATE MONDAY, REACHING
1.00"+ BY TUESDAY AND WEDNESDAY. AS A RESULT, THE CHANCE OF
SHOWERS AND THUNDERSTORMS WILL INCREASE THROUGH MID-WEEK AS THE
INFLUX OF MOISTURE CONTINUES. WHILE STORMS MAY INITIALLY BE
ANEMIC AND PRODUCE GUSTY OUTFLOWS EARLY IN THE WEEK, STORMS WILL
EVOLVE INTO HEAVY RAIN PRODUCERS IF PWATS CLIMB NEAR/ABOVE
1.00". MAX TEMPS WILL HOVER AT 5-10 DEGREES ABOVE NORMAL THROUGH
THE WEEK.
AVIATION /12Z THURSDAY THROUGH FRIDAY/
ISSUED 512 AM MDT THU JUL 9 2026
VFR. LOCALIZED TERRAIN OBSTRUCTION FROM WILDFIRE SMOKE. HIGH
DENSITY ALTITUDE DUE TO HEAT. SURFACE WINDS: W-NW 5-15 KT, WITH
GUSTS 20-25 KT FROM KMUO TO KTWF/KJER. WINDS ALOFT AT 10KFT MSL:
S-W 5-15 KT.
KBOI...VFR. HIGH DENSITY ALTITUDE DUE TO HEAT. FOOTHILLS MAY BE
OBSCURED AT TIMES DUE TO NEARBY WILDFIRE SMOKE. SURFACE WINDS:
W-N 5-12 KT. AFTERNOON GUSTS TO 15-20 KT.
WEEKEND OUTLOOK...VFR. LOCALIZED VISIBILITY REDUCTIONS IN THE
VICINITY OF WILDFIRES. ISOLATED CONVECTION OVER CENTRAL ID MTNS
FRIDAY. HIGH DENSITY ALTITUDE DUE TO HEAT, ESP SATURDAY. SURFACE
WINDS: SW-NW 5-15 KT FRIDAY THROUGH SUNDAY. AFTERNOON GUSTS TO
20-30 KT MAINLY ACROSS E OREGON AND THE HIGHER TERRAIN OF SW
IDAHO.
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
AVIATION.....SH
SHORT TERM...SH
LONG TERM....SH
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