849
FXUS65 KBOI 272037
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
237 PM MDT WED MAY 27 2026
KEY MESSAGES
- STRONG THUNDERSTORMS CAPABLE OF WIND GUSTS TO 60 MPH, BLOWING
DUST, SMALL HAIL, AND BRIEF HEAVY RAIN POSSIBLE TODAY, WITH
THE HIGHEST POTENTIAL ACROSS SOUTHEAST OREGON AND WEST-CENTRAL
IDAHO MOUNTAINS.
- BREEZY EAST-SOUTHEAST WINDS TODAY WITH GUSTS 30 TO 40 MPH
ACROSS SOUTHEAST OREGON AND IDAHO SOUTH OF BOISE.
- ADDITIONAL SHOWERS AND THUNDERSTORMS AND PERIODS OF GUSTY
WINDS THURSDAY THROUGH SUNDAY.
- THUNDERSTORMS MAY PRODUCE GUSTY WINDS 40-60 MPH AND BLOWING
DUST, HEAVY RAIN, AND HAIL THROUGH THE WEEK.
SHORT TERM /THROUGH FRIDAY NIGHT/
ACTIVE WEATHER WILL CONTINUE THROUGH THE END OF THE WEEK AS A
CLOSED UPPER LOW OVER THE WESTERN GREAT BASIN BRINGS ROUNDS OF
SHOWERS AND THUNDERSTORMS TO OUR AREA. SCATTERED THUNDERSTORMS
ARE FORMING OVER THE CENTRAL ID MOUNTAINS AND SOUTHEAST OR ALONG
THE NV BORDER THIS AFTERNOON. THUNDERSTORMS THIS AFTERNOON ARE
CAPABLE OF WIND GUSTS TO 60 MPH, BLOWING DUST, SMALL HAIL, AND
BRIEF HEAVY RAIN AS THE PRIMARY HAZARDS. THE HIGHEST CHANCE FOR
THUNDERSTORMS (30-50%) WILL BE ACROSS SOUTHEAST OREGON AND THE
WEST CENTRAL ID MOUNTAINS. CONDITIONS SHOULD IMPROVE AFTER
SUNSET.
CONDITIONS THURSDAY WILL BE SIMILAR TO TODAY AS THE LOW REMAINS
NEARLY STATIONARY. STRONG THUNDERSTORMS WILL ONCE AGAIN BE
POSSIBLE, WITH THE HIGHEST POTENTIAL REMAINING ACROSS SOUTHEAST
OREGON AND WEST-CENTRAL IDAHO. TEMPERATURES WILL BE SIMILAR
WITH BREEZY SOUTHERLY WINDS GUSTING TO 20-35 MPH. ON FRIDAY, THE
UPPER LOW WILL START TO LIFT NORTH AS AN UPPER TROUGH APPROACHES
THE PACIFIC NORTHWEST. SHOWERS AND THUNDERSTORMS WILL INCREASE
ACROSS THE AREA AS THE LOW APPROACHES WITH LOCALIZED HEAVY RAIN
POSSIBLE FROM STORMS. TEMPERATURES WILL COOL BY 5-10 DEGREES,
AND WINDS OUTSIDE OF THUNDERSTORMS WILL NOT BE AS BREEZY AS
PREVIOUS DAYS.
LONG TERM /SATURDAY THROUGH WEDNESDAY/
THE UPPER LOW SITTING OVER THE GREAT BASIN WILL MERGE WITH AN
INCOMING PACIFIC LONGWAVE TROUGH ON SATURDAY. THIS MERGED SYSTEM
WILL STEER NORTHEASTWARD AND CONTINUE SHOWERS/THUNDERSTORMS
MAINLY OVER HIGHER TERRAIN AREAS OF SOUTHWEST/WEST-CENTRAL ID ON
SATURDAY. UNCERTAINTY REMAINS OVER THE TRACK AND STRENGTH OF
ANOTHER SHORTWAVE TROUGH ARRIVING TO THE AREA ON SUNDAY. FOR
NOW, WILL MAINTAIN A 20-40% CHANCE OF SHOWERS/ THUNDERSTORMS
OVER THE HIGHER TERRAIN IN SW IDAHO. A DRYING TREND WILL SET IN
MONDAY THROUGH WEDNESDAY OF NEXT WEEK, AS A RIDGE BUILDS IN OVER
THE NORTHWEST REGION. TEMPERATURES WILL TREND UPWARD THROUGHOUT
THE LONG-TERM PERIOD, REACHING NEAR NORMAL COME SUNDAY BEFORE
INCREASING TO 10-15 DEGREES ABOVE NORMAL COME WEDNESDAY.
AVIATION /18Z WEDNESDAY THROUGH THURSDAY/
ISSUED 1126 AM MDT WED MAY 27 2026
VFR. ISOLATED SHOWERS CONTINUING THROUGH THE EARLY AFTERNOON,
THEN SCATTERED SHOWERS/THUNDERSTORMS THIS AFTERNOON.
THUNDERSTORMS CAPABLE OF SMALL HAIL, OUTFLOWS TO 40-50 KT, AND
BRIEF HEAVY RAIN. SHOWERS/THUNDERSTORMS TAPERING OFF AFTER
SUNSET. SURFACE WINDS OUTSIDE OF STORMS: NE-SE 10-25 KT WITH
GUSTS TO 30-40 KT EARLY AFTERNOON THROUGH EVENING. WINDS ALOFT
AT 10KFT MSL: E-SE 20-35 KT.
KBOI...VFR. A 30% CHANCE OF THUNDER OVER TERMINAL THIS
AFTERNOON 20Z-THU/00Z. STORMS CAPABLE OF OUTFLOWS OF 30-45 KT,
SMALL HAIL, AND BRIEF HEAVY RAIN. SHOWERS AND STORMS TAPERING
OFF AFTER THU/00Z. SURFACE WINDS OUTSIDE OF STORMS: NW 8-12 KT
EARLY THIS AFTERNOON, THEN S-SE 10-15 KT WITH GUSTS 20-25 KT
LATE AFTERNOON.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...KA
LONG TERM....JY
AVIATION.....JY
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