976
FXUS65 KBOI 090824
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
224 AM MDT THU JUL 9 2026
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/
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
45 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/
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 /06Z THURSDAY THROUGH FRIDAY/
ISSUED 1123 PM MDT WED JUL 8 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 5-15 KT. AFTERNOON GUSTS NEAR 20 KT.
WEEKEND OUTLOOK...VFR, EXCEPT 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
SHORT TERM...SH
LONG TERM....SH
AVIATION.....SH
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