787
FXUS65 KBOI 062001
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
201 PM MDT THU AUG 6 2026
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/
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/
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 /18Z THURSDAY THROUGH FRIDAY/
ISSUED 1127 AM MDT THU AUG 6 2026
AREAS OF MVFR VISIBILITY AND MOUNTAIN OBSCURATION DUE TO
WILDFIRE SMOKE, OTHERWISE VFR. HIGH DENSITY ALTITUDE EACH
AFTERNOON DUE TO HOT TEMPERATURES. SURFACE WINDS:
W-NW 5-12KT WITH GUSTS TO 18KT UNTIL 07/01Z THEN VARIABLE
LESS THAN 8 KT. WINDS ALOFT AT 10KFT MSL: W-SW 5-10KT.
KBOI...WILDFIRE SMOKE BUT GENERALLY REMAINING VFR. MOUNTAINS
OBSCURED AT TIMES. HIGH DENSITY ALTITUDE EACH AFTERNOON DUE
TO HOT TEMPERATURES. SURFACE WINDS: WNW AROUND 10 KT UNTIL
07/01Z THEN SE AROUND 5 KT.
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. LESS THAN 10%
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
SHORT TERM...LC
LONG TERM....LC
AVIATION.....LC
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