546
FXUS65 KBOI 062359
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
559 PM MDT THU AUG 6 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- CONTINUED VERY HOT THROUGH SATURDAY.
- CONTINUED SMOKY THROUGH AT LEAST SUNDAY.
- BREEZY AFTERNOON WINDS FRIDAY THROUGH SUNDAY.
- SLIGHT CHANCE OF THUNDERSTORMS ALONG THE ID/NV SATURDAY
AND SUNDAY AS HIGH-LEVEL MONSOON MOISTURE ADVANCES
NORTHWARD.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 201 PM MDT THU AUG 6 2026
CONTINUED VERY HOT THROUGH SATURDAY AND ALSO DRY AND SMOKY,
AS THE MAIN UPPER RIDGE OVER THE GREAT BASIN REACHES MAXIMUM
INTENSITY. FRIDAY SHOULD BE THE HOTTEST DAY BY A SLIGHT MARGIN.
A WEAK PACIFIC COLD FRONT AND SUPPORTING UPPER TROUGH WILL
WEAKEN THE MAIN UPPER RIDGE AND BRING GRADUAL COOLING BEGINNING
SATURDAY NIGHT. HIGH LEVEL MONSOON MOISTURE WILL ADVANCE
NORTHWARD TO THE NV/ID BORDER LATE SATURDAY AFTER BEING KEPT
WELL SOUTH THE PAST TWO WEEKS. THIS MOISTURE, TOGETHER WITH THE
WEAK INCOMING COLD FRONT, WILL BRING A SLIGHT CHANCE OF HIGH-
BASED THUNDERSTORMS TO OWYHEE AND TWIN FALLS COUNTIES LATE
SATURDAY AND SATURDAY NIGHT. AFTERNOON WINDS WILL BE BREEZY,
ESPECIALLY SATURDAY IN SOUTHERN ZONES, AS THE COLD FRONT
APPROACHES. THUNDERSTORM OUTFLOW GUSTS MUST ALSO BE CONSIDERED
NEAR THE NV/ID BORDER LATE SATURDAY.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 201 PM MDT THU AUG 6 2026
THE GRADUAL COOLING WILL END TUESDAY WHEN TEMPERATURES ARE ONLY
3 TO 6 DEGREES ABOVE NORMAL UNDER DRY ZONAL FLOW ALOFT. FLOW
WILL BECOME SOUTHWESTERLY AGAIN WEDNESDAY AHEAD OF THE NEXT
APPROACHING NORTH PACIFIC TROUGH, AND MONSOON MOISTURE WILL
AGAIN ADVANCE NORTHWARD TO THE NV/ID BORDER, ESPECIALLY INTO
AND EAST OF TWIN FALLS COUNTY. THURSDAY'S FORECAST IS LESS CLEAR
AS THE GFS BRINGS THE NEXT COOL UPPER TROUGH INLAND WHILE ECMWF
COMPLETELY ELIMINATES IT. WE HOPE FOR BETTER MODEL CONSISTENCY
TONIGHT OR TOMORROW. EITHER WAY, HIGH TEMPERATURES SHOULD STAY
BELOW 100 DEGREES EVEN UNDER SOUTHWEST FLOW ALOFT, AS THE MAIN
UPPER RIDGE CONTINUES TO SLOWLY WEAKEN AND SHIFT SOUTH.
AVIATION /00Z FRIDAY THROUGH SATURDAY/
ISSUED 548 PM MDT THU AUG 6 2026
WILDFIRE SMOKE WILL CONTINUE TO BRING MVFR CONDITIONS OVERNIGHT
TONIGHT WITH IFR CONDITIONS LIKELY IN KBNO-KBKE-KONO. CONDITIONS
WILL IMPROVE TO VFR BY LATE TOMORROW MORNING. HIGH DENSITY
ALTITUDE EACH AFTERNOON DUE TO HOT TEMPERATURES. MOUNTAINS
OBSCURED IN SMOKE. SURFACE WINDS: VARIABLE OVERNIGHT LESS THAN
10 KT, THEN WNW 5-15 KT BY LATE MORNING. WINDS ALOFT AT 10KFT:
W-SW 10-20 KT.
KBOI...SMOKE WILL SETTLE OVERNIGHT, BRINGING MVFR CONDITIONS TO
THE TERMINAL THROUGH THE LATE MORNING. VFR CONDITIONS WILL
LIKELY RETURN TOMORROW AFTERNOON AS SMOKE SLIGHTLY LIFTS IN THE
VALLEY. FOOTHILLS OBSCURED IN SMOKE. SURFACE WINDS: SE 3-6 KT
OVERNIGHT, THEN NW 6-10 KT BY LATE MORNING.
WEEKEND OUTLOOK...AREAS OF MVFR VISIBILITY AND LOCAL MOUNTAIN
OBSCURATION DUE TO WILDFIRE SMOKE, OTHERWISE VFR. HIGH DENSITY
ALTITUDE EACH AFTERNOON DUE TO HOT TEMPERATURES. A 15% CHANCE OF
AFTERNOON THUNDERSTORMS ALONG ID/NV BORDER FRIDAY THROUGH
SUNDAY. SURFACE WINDS: W-NW 7-12 KT WITH GUSTS 15 TO 20 KT
DURING THE AFTERNOONS/EARLY EVENINGS, OTHERWISE VARIABLE LESS
THAN 10 KT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR QUALITY ALERT UNTIL 2 PM MDT FRIDAY FOR IDZ011>015-028-029-
033.
HEAT ADVISORY UNTIL 9 PM MDT SATURDAY FOR IDZ012-014>016-029-
030-033.
OR...HEAT ADVISORY UNTIL 9 PM MDT /8 PM PDT/ SATURDAY FOR
ORZ061>064.
AIR QUALITY ALERT UNTIL 1 PM MDT /NOON PDT/ FRIDAY FOR
ORZ061>064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SA
SHORT TERM...LC
LONG TERM....LC
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