973
FXUS65 KBOI 222330
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
530 PM MDT SAT AUG 22 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- SCATTERED SHOWERS AND STRONG THUNDERSTORMS IN SOUTH-CENTRAL
IDAHO THROUGH THIS EVENING. ISOLATED SHOWERS AND WEAKER
THUNDERSTORMS ELSEWHERE IN WESTERN IDAHO UNTIL SUNSET.
CLEARING IN EASTERN OREGON.
- GUSTY OUTFLOW WINDS UP TO 50 MPH FROM THUNDERSTORMS IN SOUTH-
CENTRAL IDAHO THROUGH SUNSET.
- DRY AND SLIGHTLY COOLER SUNDAY, THEN SEVERAL DEGREES WARMER
AGAIN MONDAY WITH A CHANCE OF AFTERNOON THUNDERSTORMS IN
SOUTHERN AREAS.
SHORT TERM /THROUGH MONDAY NIGHT/
ISSUED 213 PM MDT SAT AUG 22 2026
AT 1 PM MDT SCATTERED SHOWERS AND THUNDERSTORMS WERE ALREADY
UNDERWAY IN OWYHEE AND TWIN FALLS COUNTIES, MOVING NORTHEAST.
THESE WILL INCREASE IN COVERAGE THE REST OF THE AFTERNOON AND
EARLY EVENING, PARTICULARLY IN EASTERN OWYHEE AND TWIN FALLS
COUNTIES WHERE MONSOON MOISTURE STILL EXISTS. MEANWHILE, A
PACIFIC COLD FRONT HAS DEVELOPED A BAND OF LIGHT RAIN SHOWERS
AND ISOLATED THUNDERSTORMS IN BAKER AND MALHEUR COUNTIES. THE
FRONT AND THE SHOWERS/STORMS WILL MOVE EASTWARD INTO IDAHO THIS
AFTERNOON AND EVENING AND HELP ENHANCE THE THUNDERSTORMS IN
SOUTH-CENTRAL IDAHO. COOLER AND DRIER AIR WILL COME IN FROM THE
WEST OVERNIGHT AND SUNDAY, BUT A SLIGHT CHANCE OF AFTERNOON
THUNDERSTORMS WILL DEVELOP AGAIN IN TWIN FALLS COUNTY SUNDAY
AFTERNOON. MONDAY LOOKS SEVERAL DEGREES WARMER AGAIN AS AN
UPPER TROUGH EXITS EAST, REPLACED BY A WEAK UPPER RIDGE OVER
OREGON. MID-LEVEL MOISTURE WILL AGAIN INCREASE AND LEAD TO A 15
TO 30 PERCENT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS IN
SOUTHERN AREAS, WHILE NORTHERN AREAS STAY DRY WITH INCREASING
CLOUDS IN THE AFTERNOON.
LONG TERM /TUESDAY THROUGH SATURDAY/
ISSUED 213 PM MDT SAT AUG 22 2026
TROUGHING OFF THE SHORE OF WASHINGTON AND OREGON WILL KEEP MOST
MONSOONAL MOISTURE EAST OF OUR AREA. THIS WILL KEEP MOSTLY DRY
CONDITIONS ACROSS THE AREA, WITH A LOW CHANCE (UNDER 15%) OF
AFTERNOON SHOWERS AND THUNDERSTORMS ACROSS OUR FAR EASTERN
ZONES. OTHERWISE, BREEZY CONDITIONS WILL SET IN WITH A SLIGHT
COOLING TREND. TEMPERATURES COME TUESDAY WILL BE AROUND 5-10
DEGREES ABOVE NORMAL, COOLING TO NEAR NORMAL COME SATURDAY.
AVIATION /00Z SUNDAY THROUGH MONDAY/
ISSUED 529 PM MDT SAT AUG 22 2026
VFR. SCATTERED SHOWERS AND THUNDERSTORMS THIS AFTERNOON.
COVERAGE WILL CONTINUE THIS EVENING MAINLY IN SW-IDAHO. THUNDER
CAPABLE OF BRIEF HEAVY RAIN, HAIL, AND ERRATIC OUTFLOWS TO
40-50 KT. BLDU POSSIBLE WITH OUTFLOWS. HIGH DENSITY ALTITUDE
THIS AFTERNOON DUE TO HEAT. SURFACE WINDS OUTSIDE OF STORMS:
VARIABLE 5-15 KT, EXCEPT SW 10-20 KT WITH GUSTS TO 25-30 KT IN
E-OREGON THROUGH 03Z. WINDS ALOFT AT 10KFT MSL: S-SW 10-25 KT.
KBOI...VFR. A 20% CHANCE OF THUNDERSTORMS THIS AFTERNOON INTO
EVENING. THUNDERSTORMS CAPABLE OF BRIEF HEAVY RAIN, HAIL, AND
OUTFLOWS TO 30-40 KT. BLDU POSSIBLE IN OUTFLOWS. HIGH DENSITY
ALTITUDE THIS AFTERNOON DUE TO HEAT. SURFACE WINDS: NW-N 6-12 KT
THIS AFTERNOON, BECOMING SE 5-15 KT TONIGHT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...RED FLAG WARNING UNTIL MIDNIGHT MDT TONIGHT FOR IDZ401>403-421-
424-426.
OR... RED FLAG WARNING UNTIL 8 PM PDT THIS EVENING FOR ORZ670>672.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....CH
SHORT TERM...LC
LONG TERM....NF
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