807
FXUS65 KBOI 212026
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
226 PM MDT SUN JUN 21 2026
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/
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/
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 /18Z SUNDAY THROUGH MONDAY/
ISSUED 1140 AM MDT SUN JUN 21 2026
VFR. HAZY IN LOWER ELEVATION VALLEYS WITH CUMULUS BUILDUPS OVER
HIGH TERRAIN, OTHERWISE CLEAR. ISOLATED SHOWERS AND
THUNDERSTORMS OVER HIGH TERRAIN NEAR KGNG/KJER/KTWF THIS
AFTERNOON. SURFACE WINDS: W-NW 5-15 KT BECOMING VARIABLE LESS
THAN 10 KT OVERNIGHT. WINDS ALOFT AT 10KFT: W 10-20 KT.
KBOI...VFR. HAZY SKIES, CLEARING AS THE AFTERNOON PROGRESSES.
SURFACE WINDS: NW 5-10 KT WITH GUSTS TO 20 KT THIS AFTERNOON,
THEN VARIABLE LESS THAN 6 KT OVERNIGHT.
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
SHORT TERM...SA
LONG TERM....SA
AVIATION.....SA
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