859
FXUS65 KBOI 260104
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
704 PM MDT MON MAY 25 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- GUSTY WINDS TODAY, RESULTING IN CRITICAL FIRE WEATHER
CONDITIONS IN SOUTHEASTERN OREGON.
- SCATTERED SHOWERS/THUNDERSTORMS IN IDAHO TODAY WITH OUTFLOW
GUSTS AS STRONG AS 60 MPH AND BLOWING DUST.
- MUCH COOLER TUESDAY THROUGH THE REST OF THE WEEK AS
PRECIPITATION CONTINUES.
SHORT TERM /THROUGH WEDNESDAY NIGHT/
ISSUED 241 PM MDT MON MAY 25 2026
WARM TODAY WITH HIGH TEMPS 10-15 DEGREES ABOVE NORMAL. A STRONG
COLD FRONT WILL PASS THROUGH EASTERN OREGON TONIGHT AND WESTERN
IDAHO TOMORROW MORNING. AHEAD OF THE COLD FRONT, HIGH BASED
SHOWERS AND THUNDERSTORMS ARE DEVELOPING IN SW IDAHO HIGHLANDS
AND IN CENTRAL IDAHO MOUNTAINS. THESE STORMS ARE CAPABLE OF
PRODUCING OUTFLOWS 40-60 MPH IN AN ENVIRONMENT WITH 1000 J/KG OF
DCAPE. ALSO AHEAD OF THE FRONT, WINDS ACROSS THE AREA ARE
INCREASING. IN SE OREGON, SUSTAINED WINDS OF 20-30 MPH AND GUSTS
UP TO 40 MPH WITH DRY CONDITIONS HAVE PROMPTED THE ISSUANCE OF A
RED FLAG WARNING. WINDS IN SW IDAHO WILL BE SLIGHTLY LOWER,
10-20 MPH SUSTAINED AND GUSTS UP TO 30 MPH OUTSIDE OF
THUNDERSTORMS. WINDS WILL ALSO KICK UP BLOWING DUST, LOCALLY
REDUCING VISIBILITY AND AIR QUALITY. WHILE STORMS TODAY ARE HIGH
BASED AND DRY, TONIGHT AND TOMORROW BEHIND THE FRONT
PRECIPITATION CHANCES INCREASE AND TEMPERATURES DROP DOWN TO
NEAR NORMAL. SCATTERED SHOWERS CONTINUE OVER THE REGION THROUGH
WEDNESDAY, WITH STORM TOTAL RAINFALL AMOUNTS AROUND 0.25 INCHES
FOR MUCH OF THE AREA, LOWER IN THE SNAKE PLAIN AND HIGHER OVER
MOUNTAINS. THUNDERSTORMS ARE POSSIBLE EACH AFTERNOON/EVENING
WITH GUSTY WINDS AND HEAVIER RAINFALL RATES.
LONG TERM /THURSDAY THROUGH MONDAY/
ISSUED 241 PM MDT MON MAY 25 2026
AN ACTIVE WEATHER PATTERN WILL CONTINUE THROUGH MOST OF THE
LONG-TERM PERIOD, AS THE UPPER LOW LINGERING OVER THE GREAT
BASIN WILL CONTINUE WIDESPREAD SHOWERS AND THUNDERSTORMS
THURSDAY THROUGH SATURDAY. TEMPERATURES WILL MOSTLY HOVER NEAR
OR SLIGHTLY BELOW NORMAL THROUGH THE END OF THE WEEK. AN UPPER
TROUGH WILL SLOWLY STEER INTO THE NORTHWEST REGION FROM OFF THE
COAST OF BRITISH COLUMBIA OVER THE WEEKEND. THERE IS STRONG
GUIDANCE AGREEMENT THAT THIS LARGER SYSTEM WILL SWALLOW THE LOW
OVER THE GREAT BASIN AND STEER IT AS A SHORTWAVE TROUGH OVER OUR
AREA. THIS PATTERN WILL LIKELY CONTINUE WIDESPREAD SHOWERS AND
THUNDERSTORMS ON SATURDAY. SUNDAY WILL LIKELY SEE
SHOWERS/THUNDERSTORMS OVER HIGHER TERRAIN AS THIS MERGED SYSTEM
MOVES OUT, BEFORE A BROAD RIDGE BUILDS IN AND RETURNS WARMER AND
DRIER CONDITIONS EARLY NEXT WEEK.
AVIATION /00Z TUESDAY THROUGH WEDNESDAY/
ISSUED 651 PM MDT MON MAY 25 2026
GENERALLY VFR. SCATTERED SHOWERS THUNDERSTORMS LINGERING OVER NE
OREGON AND SW IDAHO THROUGH EVENING. THUNDERSTORMS CAPABLE OF
30-45 KT OUTFLOWS AND BLOWING DUST. SHOWERS INCREASING ACROSS
EASTERN OR EARLY TUE/AM, WITH CEILINGS LOWERING TO MVFR NEAR
KBKE/KBNO. SURFACE WINDS OUTSIDE OF STORMS: SE-SW 10-20 KT WITH
GUSTS TO 15-35 KT THIS EVENING. A COLD FRONT TONIGHT WILL
SWITCH WINDS TO W-NW 10-25 KT WITH GUSTS TO 25-40 KT, STRONGEST
NEAR KBKE/KONO. WINDS ALOFT AT 10KFT MSL: S-SW 10-30 KT.
KBOI...VFR. OCCASIONAL WEAK SHOWERS/VIRGA OVERNIGHT THROUGH
TUESDAY MORNING. SHOWERS WILL INCREASE TUESDAY AFTERNOON, WITH A
20% CHANCE OF LIGHTNING. SURFACE WINDS OUTSIDE OF STORMS: S-E
5-15 KT. COLD FRONT WILL SHIFT WINDS TO W-NW AROUND 26/06Z,
WITH NW 5-15 KT BEHIND COLD FRONT. PERIOD OF GUSTS TO 20-25 KT
POSSIBLE WITH FRONTAL PASSAGE.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
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.....SH
SHORT TERM...JM
LONG TERM....JY
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page