191
FXUS65 KBOI 072333
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
533 PM MDT FRI AUG 7 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- CONTINUED HOT THROUGH SUNDAY THEN GRADUAL COOLING THROUGH
NEXT WEEK.
- SMOKE PERSISTING THROUGH AT LEAST MONDAY.
- BREEZY AFTERNOON WINDS THROUGH SUNDAY.
- ISOLATED LATE-DAY THUNDERSTORMS NEAR THE ID/NV BORDER SATURDAY
AND SUNDAY AS HIGH-LEVEL MONSOON MOISTURE ADVANCES NORTHWARD.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 225 PM MDT FRI AUG 7 2026
HOT, SMOKY WEATHER WILL PERSIST THROUGH THE WEEKEND WITH AN
UPPER LEVEL HIGH OVER THE GREAT BASIN BUT GRADUALLY WEAKENING.
SATURDAY LOOKS 1-3 DEGREES COOLER THAN TODAY, AND ANOTHER 2-4
DEGREES COOLER SUNDAY AS A WEAK PACIFIC COLD FRONT MOVES
THROUGH. LOW TEMPS WILL CHANGE LITTLE, THOUGH. MONSOON MOISTURE
NEAR THE SOUTHERN ID BORDER WILL BRING A SLIGHT CHANCE OF LATE-
DAY THUNDERSTORMS SATURDAY, AND AGAIN LATE SUNDAY BUT MAINLY IN
EASTERN OWYHEE AND SOUTHERN TWIN FALLS COUNTIES. THUNDERSTORMS
WILL BE HIGH-BASED WITH STRONG DOWNDRAFTS AND GUSTY OUTFLOW
WINDS BUT LITTLE RAIN. LATEST SMOKE MODELS SHOW LITTLE IF ANY
IMPROVEMENT THROUGH THE WEEKEND, WITH WORST CONDITIONS
CONTINUING IN EASTERN OREGON.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 225 PM MDT FRI AUG 7 2026
GRADUAL COOLING NOW EXPECTED TO CONTINUE THROUGH THE COMING
WEEK WHEREAS YESTERDAY'S FORECAST HELD TEMPERATURES LEVEL AFTER
MONDAY. THE PERSISTENT UPPER RIDGE OVER THE GREAT BASIN IS
FORECAST TO SLOWLY WEAKEN AND RETREAT SOUTHWARD AS COOLER
WESTERLY FLOW COMES IN ACROSS THE NORTHERN INTERMOUNTAIN REGION.
A LOW-AMPLITUDE TROUGH WILL DEVELOP WEDNESDAY, WITH THE
WESTERLY FLOW CHANGING TO SOUTHWESTERLY AND AGAIN BRINGING
MONSOON MOISTURE NORTHWARD, LEADING TO A SLIGHT CHANCE OF
AFTERNOON THUNDERSTORMS NEAR THE NV/ID BORDER WEDNESDAY AND
THURSDAY.
AVIATION /00Z SATURDAY THROUGH SUNDAY/
ISSUED 531 PM MDT FRI AUG 7 2026
MVFR-IFR VISIBILITY AND MOUNTAIN OBSCURATION DUE TO WILDFIRE
SMOKE. HIGH DENSITY ALTITUDE DUE TO HOT AFTERNOON TEMPERATURES.
SURFACE WINDS: W-NW 5-15 KT, BECOMING VARIABLE 5-10 KT TONIGHT.
WINDS ALOFT AT 10KFT MSL: W-SW 10-20 KT.
KBOI...SMOKE FROM NEARBY WILDFIRES IMPACTING VISIBILITY WITH
BRIEF MVFR CONDITIONS. FOOTHILLS BRIEFLY OBSCURED IN SMOKE.
SURFACE WINDS: NW 8 TO 14 KT UNTIL SUNSET, THEN LIGHT SE.
WEEKEND OUTLOOK...AREAS OF MVFR VISIBILITY AND LOCAL MOUNTAIN
OBSCURATION DUE TO WILDFIRE SMOKE. HIGH DENSITY ALTITUDE EACH
AFTERNOON DUE TO HOT TEMPERATURES. A 15% CHANCE OF AFTERNOON
THUNDERSTORMS ALONG ID/NV BORDER EACH DAY. SURFACE WINDS:
W-NW 5-15 KT WITH GUSTS 15 TO 25 KT DURING THE AFTERNOONS/EARLY
EVENINGS, OTHERWISE VARIABLE LESS THAN 10 KT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR QUALITY ALERT UNTIL 1 PM MDT MONDAY FOR IDZ011>015-028-029-
033.
HEAT ADVISORY UNTIL 9 PM MDT SATURDAY FOR IDZ012-014>016-029-
030-033.
OR...AIR QUALITY ALERT UNTIL 1 PM MDT /NOON PDT/ MONDAY FOR
ORZ061>064.
HEAT ADVISORY UNTIL 9 PM MDT /8 PM PDT/ SATURDAY FOR
ORZ061>064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....JM
SHORT TERM...LC
LONG TERM....LC
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