525
FXUS65 KBOI 291803
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1203 PM MDT TUE SEP 29 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- BREEZY NORTHWEST WINDS IN THE AFTERNOON ACROSS THE WESTERN
SNAKE PLAIN AND SURROUNDING TERRAIN TODAY AND WEDNESDAY.
- FAIR SKIES WITH WARMING TEMPERATURES THROUGH THIS WEEKEND.
SHORT TERM /THROUGH THURSDAY NIGHT/
ISSUED 232 AM MDT TUE SEP 29 2026
A FLATTENED UPPER-LEVEL RIDGE CONTINUES TO BUILD INTO THE
REGION FROM THE WEST-SOUTHWEST, PROMOTING MOSTLY CLEAR SKIES,
LIGHT WINDS AND CHILLY TEMPERATURES ACROSS THE AREA THIS
MORNING. A SURFACE PRESSURE GRADIENT RESIDES OVER SOUTHWEST
IDAHO TODAY AND WEDNESDAY, RESULTING IN BREEZY AFTERNOON WINDS
ACROSS PORTIONS THE WESTERN SNAKE PLAIN AND SURROUNDING TERRAIN.
OTHERWISE, PREVAILING DRY WEST-NORTHWEST FLOW ALOFT IS
ANTICIPATED THROUGH THE SHORT TERM AS THE UPPER RIDGE
STRENGTHENS OVER THE SOUTHWEST U.S. PASSING CLOUDS WILL BE
COMMON FOR THE NORTH, WHILE MOSTLY SUNNY SKIES PERSIST FOR THE
CENTRAL AND SOUTHERN AREAS. TEMPERATURES WILL TREND WARMER EACH
DAY, REACHING UPPER 70S/LOW 80S FOR LOWER ELEVATIONS BY
THURSDAY.
LONG TERM /FRIDAY THROUGH TUESDAY/
ISSUED 232 AM MDT TUE SEP 29 2026
THE AFOREMENTIONED UPPER RIDGE OVER THE SOUTHWEST U.S. WILL
NUDGE FURTHER INTO THE PACIFIC NORTHWEST FRIDAY THROUGH THE
WEEKEND. ABOVE NORMAL TEMPERATURES WILL CONTINUE FOR SE OREGON
AND SW IDAHO, CLIMBING TO THE LOW-MID 80S FOR LOWER VALLEYS.
MODELS BRING A WEAK DISTURBANCE ACROSS THE FORECAST AREA LATE
SUNDAY AND MONDAY, INCREASING CLOUD COVER AND PRECIP CHANCES.
WHILE NBM/WPC'S PROBABILITY OF PRECIPITATION REMAINS LOW DURING
THIS TIME, SOME ENSEMBLE MEMBERS NOW INDICATE SHOWER DEVELOPMENT
ACROSS SOUTHWEST/CENTRAL IDAHO ON MONDAY DEPENDING ON MOISTURE
AVAILABILITY. THEREAFTER, THE RIDGE SHOULD REBOUND ON TUESDAY,
WITH WARM AND DRY CONDITIONS FORECAST.
AVIATION /18Z TUESDAY THROUGH WEDNESDAY/
ISSUED 1200 PM MDT TUE SEP 29 2026
VFR. SURFACE WINDS: W TO NW 5-15 KT. AFTERNOON GUSTS AROUND
20-25 KT BETWEEN KBOI-KJER. WINDS ALOFT AT 10KFT MSL: NW 10-20
KT.
KBOI...VFR. SURFACE WINDS: NW 7-12 KT WITH GUSTS AROUND 20 KT
THIS 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
AVIATION.....JM
SHORT TERM...SH
LONG TERM....SH
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