176
FXUS65 KBOI 220017
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
617 PM MDT SUN JUN 21 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- WARM AND DRY CONDITIONS THROUGH THE MIDDLE OF NEXT WEEK, WITH
ABOVE NORMAL TEMPERATURES TUESDAY-THURSDAY.
- ISOLATED SHOWERS AND THUNDERSTORMS OVER SOUTHERN BOISE
MOUNTAINS AND THE ID-NV BORDER THIS EVENING.
- COOLER TEMPERATURES AND PRECIPITATION NEXT WEEKEND.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 226 PM MDT SUN JUN 21 2026
A RIDGE OF HIGH PRESSURE WILL BUILD OVER THE REGION TODAY, WITH
CUMULUS BUILD UPS AND TERRAIN INDUCED AFTERNOON SHOWERS AND
THUNDERSTORMS IN CENTRAL IDAHO AND NEAR THE NEVADA BORDER.
PRECIPITATION CHANCES DECREASE AFTER SUNSET, WITH A WARMING AND
DRYING TREND EXPECTED FOR THE REST OF THE SHORT TERM PERIOD.
WINDS WILL INCREASE EACH AFTERNOON IN THE LOWER ELEVATION
VALLEYS, WITH OVERNIGHT GUSTY DRAINAGE WINDS IN THE BAKER VALLEY
AND ALONG THE I-84 CORRIDOR NEAR ONTARIO, OR.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 226 PM MDT SUN JUN 21 2026
HOT AND DRY CONDITIONS ARE EXPECTED THROUGH THURSDAY AS THE
RIDGE OF HIGH PRESSURE PEAKS MIDWEEK. TEMPERATURES LOOK TO BE
SLIGHTLY COOLER THAN PREVIOUSLY FORECAST, ALBEIT STILL 5-10
DEGREES ABOVE NORMAL, WITH HIGHS GENERALLY IN THE LOW TO MID 90S
FOR MOST LOWER ELEVATION VALLEYS. MODELS REMAIN KEYED IN ON A
CLOSED LOW MOVING INTO THE PACIFIC NORTHWEST ON FRIDAY, WITH
COOLER TEMPERATURES AND PRECIPITATION INCREASING THROUGH THE
WEEKEND. THE INITIAL COLD FRONTAL PASSAGE ON FRIDAY AFTERNOON
WILL LIKELY BRING GUSTY WINDS AND SHOWERS AND THUNDERSTORMS OVER
MUCH OF THE AREA. TEMPERATURES WILL BE MUCH COOLER, WITH VALLEY
HIGHS ONLY REACHING THE UPPER 60S-LOW 70S. OVERNIGHT LOWS IN
MOUNTAIN VALLEYS COULD GET CLOSE TO FREEZING SATURDAY NIGHT
INTO SUNDAY MORNING.
AVIATION /00Z MONDAY THROUGH TUESDAY/
ISSUED 611 PM MDT SUN JUN 21 2026
VFR. ISOLATED, WEAK SHOWERS/THUNDERSTORMS OVER HIGH TERRAIN
NEAR KTWF THROUGH THIS EVE. SURFACE WINDS: W-NW 5-15 KT
BECOMING VARIABLE LESS THAN 10 KT OVERNIGHT. WINDS ALOFT AT
10KFT MSL: W 10-20 KT.
KBOI...VFR. SURFACE WINDS: NW-N 5-10 KT WITH GUSTS TO 15-20 KT
BEFORE SUNSET, THEN VARIABLE LESS THAN 6 KT OVERNIGHT.
TRANSITIONING BACK TO NW AFTER MON/15Z.
BOI WATCHES/WARNINGS/ADVISORIES
ID...OR...NONE.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SH
SHORT TERM...SA
LONG TERM....SA
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