888
FXUS65 KBOI 242358
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
558 PM MDT FRI JUL 24 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- VERY HOT, DRY, AND BREEZY TO END THE WEEK.
- SMOKY FROM NEW WILDFIRES ACROSS THE AREA.
- CRITICAL FIRE WEATHER CONDITIONS, MAINLY OVER SOUTHEAST OR AND
HIGH TERRAIN OF SOUTHWEST ID, THROUGH SATURDAY EVENING.
- AFTERNOON SCATTERED THUNDERSTORMS FOR SOUTHERN TWIN FALLS
COUNTY THROUGH SATURDAY, WITH GUSTY OUTFLOW WINDS UP TO 50
MPH; A 10 PERCENT CHANCE OF THUNDERSTORMS OVER THE BOISE AND
OWYHEE MOUNTAINS.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 241 PM MDT FRI JUL 24 2026
SOUTHWEST FLOW ALOFT CONTINUES OVER THE AREA WITH HOT, DRY AND
SMOKY CONDITIONS TODAY AND SATURDAY. CRITICAL FIRE WEATHER
CONDITIONS REMAIN THROUGH SATURDAY EVENING, WITH LOW RELATIVE
HUMIDITIES AND BREEZY CONDITIONS DURING THE AFTERNOONS. SINGLE
DIGIT RELATIVE HUMIDITIES POSSIBLE ACROSS EASTERN OR THIS
AFTERNOON AND MUCH OF THE AREA SATURDAY AFTERNOON AS A DRY SLOT
SETS UP OVER EASTERN OR AND SOUTHWEST IDAHO. LINGERING MONSOON
MOISTURE WILL SLOWLY GET ERODED AWAY BY THE DRY SLOT. SCATTERED
THUNDERSTORMS ACROSS SOUTHERN TWIN FALLS COUNTY THROUGH THIS
EVENING WITH GUSTY OUTFLOW WINDS UP TO 50 MPH, AND A 10 PERCENT
CHANCE OF THUNDERSTORMS OVER THE BOISE AND OWYHEE MOUNTAINS THIS
EVENING. WESTERLY FLOW ON SATURDAY WILL ALLOW FOR NORTHWEST
WINDS TO DEVELOP THROUGH THE BAKER VALLEY CORRIDOR TO ONTARIO
SATURDAY EVENING AND SUNDAY EVENING WITH GUSTS IN EXPOSED AREAS
UP TO 40 MPH. THIS WILL HELP TO BRING SMOKE OVER CENTRAL OR DOWN
THE BAKER VALLEY INTO THE SNAKE BASIN BOTH DAYS AS WELL. NEW
LARGE FIRES IN EASTERN OR AND OWYHEES WILL ALSO CONTRIBUTE TO
INCREASED SMOKE. TEMPERATURES COOL A FEW DEGREES ON SATURDAY AND
A FEW MORE ON SUNDAY.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 241 PM MDT FRI JUL 24 2026
HIGH PRESSURE ALOFT OVER THE FOUR CORNER REGION, AND TROUGHING
OFF THE BRITISH COLUMBIA COAST, WILL KEEP OUR AREA UNDER
SOUTHWESTERLY FLOW ALOFT. THIS TROUGHING WILL HELP KEEP
MONSOONAL MOISTURE SOUTH AND EAST OF OUR AREA, LEADING TO HOT,
DRY, AND BREEZY CONDITIONS THROUGHOUT THE LONG-TERM PERIOD. LATE
IN THE WEEK THE FOUR CORNERS HIGH WILL BEGIN TO SHIFT WEST OVER
THE GREAT BASIN, ALLOWING FOR A WARMING TREND. TEMPERATURES
WILL BE NEAR NORMAL TO START THE COMING WEEK, BEFORE RISING TO
AROUND 5 DEGREES ABOVE NORMAL COME WEDNESDAY.
AVIATION /00Z SATURDAY THROUGH SUNDAY/
ISSUED 529 PM MDT FRI JUL 24 2026
WILDFIRE SMOKE LEADING TO VISIBILITY REDUCTIONS, WITH AREAS OF
MVFR IN E-OREGON AND W-IDAHO. SMOKE MOST NOTABLE OVERNIGHT WITH
SOME IMPROVEMENT DURING DAYTIME. ISOLATED THUNDERSTORMS NEAR
KTWF/KJER THIS EVENING CAPABLE OF OUTFLOWS TO 35-45 KT AND
BRIEF HEAVY RAIN, RETURNING SAT PM. HIGH DENSITY ALTITUDE DURING
PM DUE TO HEAT. SURFACE WINDS: SW-NW 5-15 KT WITH GUSTS UP TO
25 KT THROUGH EVE, STRONGEST IN E-OREGON. THEN, VARIABLE 5-15
KT OVERNIGHT. WINDS ALOFT AT 10KFT MSL: SW 15-30 KT.
KBOI...VFR WITH HAZY CONDITIONS DUE TO WILDFIRE SMOKE. HIGH
DENSITY ALTITUDE DURING AFTERNOONS/EVENINGS DUE TO HEAT.
SURFACE WINDS: NW 6-13 KT, THEN VARIABLE OR SE AROUND 5 KT
OVERNIGHT.
WEEKEND OUTLOOK...AREAS OF WILDFIRE SMOKE CONTINUING WITH
LOCALIZED MVFR VISIBILITY DURING OVERNIGHT/MORNING HOURS,
IMPROVING EACH AFTERNOON. HIGH DENSITY ALTITUDE DURING PM DUE
TO HEAT. ISOLATED THUNDERSTORMS NEAR KTWF/KJER SATURDAY PM. A
10% CHANCE OF STORMS FOR OWYHEES AND S-CENTRAL ID SUNDAY AM.
SURFACE WINDS: SW-NW 10-20 KT WITH GUSTS TO 30 KT SATURDAY,
THEN SW-NW 5-15 KT WITH GUSTS TO 25 KT SUNDAY. HIGHEST GUSTS
WILL FAVOR E OREGON AND THE SW IDAHO HIGHER TERRAIN.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR QUALITY ALERT UNTIL NOON MDT SATURDAY FOR IDZ011-012-014-
033.
RED FLAG WARNING UNTIL 9 PM MDT SATURDAY FOR IDZ401-402-423.
HEAT ADVISORY UNTIL 9 PM MDT SATURDAY FOR IDZ012-014-016-033.
RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING FOR IDZ426.
OR...RED FLAG WARNING UNTIL 9 PM MDT /8 PM PDT/ SATURDAY FOR
ORZ670>675.
HEAT ADVISORY UNTIL 9 PM MDT /8 PM PDT/ SATURDAY FOR ORZ063-
064.
AIR QUALITY ALERT UNTIL 11 AM PDT MONDAY FOR ORZ062.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SH
SHORT TERM...KA
LONG TERM....NF
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