286
FXUS65 KBOI 060948
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
348 AM MDT THU AUG 6 2026
KEY MESSAGES
- VERY HOT TEMPERATURES TODAY THROUGH SATURDAY.
- SMOKY CONDITIONS CONTINUE THROUGH THE WEEKEND.
- BREEZY WINDS FRIDAY THROUGH THE WEEKEND WITH VERY LOW
THUNDERSTORM CHANCES RETURNING ALONG THE ID/NV BORDER.
SHORT TERM /THROUGH SATURDAY NIGHT/
TEMPERATURES WILL STAY HOT AS THE UPPER-LEVEL RIDGE REMAINS
OVER THE GREAT BASIN / FOUR CORNERS REGION. THE PEAK INTENSITY
OF THE RIDGE OVER THE REGION WILL BE FRIDAY, WITH MAXIMUM
TEMPERATURES IN LOWER ELEVATIONS ABOVE 100 DEGREES. ACCORDINGLY,
A HEAT ADVISORY IS IN EFFECT STARTING THIS AFTERNOON THROUGH
SATURDAY EVENING. SOME LOCAL AREAS WITH MORNING LOWS AROUND 70
DEGREES WILL BE UNDER MAJOR HEAT RISK FRIDAY AND SATURDAY, WHILE
THE REST OF THE AREA WITH MORNING LOWS IN THE 60S AND 50S SEE
MODERATE TO MINOR HEAT RISK. THE RIDGE WILL BEGIN TO FLATTEN
FRIDAY NIGHT, WITH STRONGER WESTERLY FLOW ALOFT MOVING OVERHEAD.
THIS WILL MODERATE THE TEMPERATURES SATURDAY COMPARED TO FRIDAY
ALONGSIDE INCREASING AFTERNOON WIND GUSTS, ESPECIALLY IN
SOUTHWEST IDAHO. BEGINNING FRIDAY THROUGH THE WEEKEND, WIND
GUSTS 20 TO 30 MPH ARE POSSIBLE IN OPEN AREAS AND RIDGES.
ELSEWHERE, GUSTS UP TO 20 MPH ARE POSSIBLE. ADDITIONALLY, WHILE
A VERY LOW (<5%) CHANCE, ISOLATED THUNDERSTORMS ARE POSSIBLE
ALONG THE ID/NV BORDER FRIDAY AND SATURDAY AFTERNOONS. THIS IS A
RESULT OF SOME MONSOONAL MOISTURE REACHING THE NORTHERN ROCKIES
AS THE FOUR CORNERS RIDGE VERY SLIGHTLY WEAKENS AND MOVES A BIT
EAST. SMOKE IMPACTS ARE EXPECTED TO CONTINUE.
LONG TERM /SUNDAY THROUGH THURSDAY/
THE FOUR CORNERS RIDGE WILL REMAIN WITH CONTINUED FLATTENING
OVER THE REGION FROM UPPER-LEVEL TROUGHING REMAINING OFFSHORE.
TEMPERATURES WILL BE NEAR NORMAL TO 5 DEGREES ABOVE NORMAL
THROUGH THE PERIOD. MONSOON MOISTURE WILL CONTINUE TO REACH FAR
SE OREGON AND SOUTHWEST ID SOUTH OF THE SNAKE BASIN THROUGH
EARLY NEXT WEEK. THERE IS INCREASING CONFIDENCE IN A SLIGHT
CHANCE OF THUNDERSTORMS ALONG THE NV BORDER EACH AFTERNOON.
WESTERLY FLOW ALOFT WILL CONTINUE BREEZY CONDITIONS, ESPECIALLY
DURING THE AFTERNOONS AND EARLY EVENINGS. SMOKY CONDITIONS WILL
CONTINUE FROM AREA WILDFIRES WHICH MAY KEEP TEMPERATURES
SLIGHTLY COOLER THAN FORECAST. BY THURSDAY, A SIGNIFICANT
PATTERN CHANGE IS BEING CONVERGED UPON BY LONG RANGE MODELS. THE
UPPER-LEVEL TROUGHING THAT HAS BEEN SITTING OFFSHORE UNTIL NOW
MOVES INLAND, BRINGING COOLER TEMPERATURES AND BETTER CHANCES OF
PRECIPITATION THAN THE AREA HAS SEEN IN SOME TIME. AS WITH MOST
THINGS THIS FAR IN THE LONG TERM, THESE DETAILS ARE FICKLE AND
SUBJECT TO QUICK CHANGES FORECAST TO FORECAST.
AVIATION /06Z THURSDAY THROUGH FRIDAY/
ISSUED 1156 PM MDT WED AUG 5 2026
REDUCED VISIBILITY DUE TO WILDFIRE SMOKE, WITH AREAS OF MVFR-IFR AND
MOUNTAIN OBSCURATION, OTHERWISE VFR. HIGH DENSITY ALTITUDE EACH
AFTERNOON DUE TO HOT TEMPERATURES. SURFACE WINDS: VARIABLE LESS
THAN 10 KT OVERNIGHT, BECOMING WNW 8-12 KT AFTER 18Z. WINDS
ALOFT AT 10KFT MSL: W-NW 5-15 KT SHIFTING TO SW 5-15KT BY 18Z.
KBOI...WILDFIRE SMOKE, GENERALLY REMAINING VFR. MOUNTAINS
OBSCURED AT TIMES. SURFACE WINDS: VARIABLE LESS THAN 5 KT,
BECOMING WNW AROUND 10 KT AFTER 18Z THURSDAY.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR QUALITY ALERT UNTIL 2 PM MDT FRIDAY FOR IDZ011>015-028-029-
033.
HEAT ADVISORY FROM 2 PM THIS AFTERNOON TO 9 PM MDT SATURDAY
FOR IDZ012-014>016-029-030-033.
AIR QUALITY ALERT UNTIL 1 PM MDT THIS AFTERNOON FOR IDZ016-030.
OR...HEAT ADVISORY FROM 2 PM MDT /1 PM PDT/ THIS AFTERNOON TO 9 PM
MDT /8 PM PDT/ SATURDAY FOR ORZ061>064.
AIR QUALITY ALERT UNTIL 1 PM MDT /NOON PDT/ THIS AFTERNOON FOR
ORZ061>064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...CH
LONG TERM....CH
AVIATION.....CH
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