908
FXUS65 KBOI 210610
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1210 AM MDT SUN JUN 21 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- SHOWERS NORTH AND SCATTERED THUNDERSTORMS SOUTH FOR THE REST
OF THIS AFTERNOON, FOLLOWED BY GRADUAL CLEARING TONIGHT.
- DAYTIME TEMPERATURES REMAINING NEAR NORMAL THROUGH SUNDAY,
THEN HOTTER AND DRIER MONDAY THROUGH WEDNESDAY, AND REMAINING
HOT AND DRY THURSDAY.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 221 PM MDT SAT JUN 20 2026
TODAY'S RAIN HAS GREATLY MOISTENED THE LOWER ATMOSPHERE AND
SHOWERS SHOULD KEEP NORTHERN AREAS COOL, MOIST, AND STABLE
THE REST OF TODAY, WITH PARTIAL CLEARING TONIGHT. SOUTHERN
AREAS, HOWEVER, HAVE PARTIALLY CLEARED AND RAPID DESTABILIZATION
HAS LED TO THUNDERSTORM DEVELOPMENT THAT WILL CONTINUE THE
REST OF THE AFTERNOON, ENDING EARLY EVENING IN SOUTH-
CENTRAL IDAHO. THE CLEARING AND COOLER OVERNIGHT AND MOSTLY
SUNNY SUNDAY. CONTINUED MOSTLY CLEAR INTO MONDAY AND 3 TO 5
DEGREES WARMER THAN SUNDAY.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 221 PM MDT SAT JUN 20 2026
A RIDGE OF HIGH PRESSURE WILL CONTINUE TO BUILD OVER THE WEST
COAST THROUGH THURSDAY, BRINGING A GRADUAL WARMING AND DRYING
TREND THROUGH THE MIDDLE OF THE WEEK. HOT DAYTIME TEMPERATURES
WILL PEAK ON WEDNESDAY, WITH VALLEYS SEEING HIGHS IN THE UPPER
90S AND NEAR 100F. HIGHER ELEVATIONS WILL SEE TEMPERATURES IN
THE UPPER 80S. A WEAK SHORTWAVE TROUGH WILL HELP COOL
TEMPERATURES DOWN AND BRING A LOW CHANCE OF MOUNTAIN SHOWERS
ON THURSDAY. CONDITIONS WILL BRIEFLY DRY OUT LATE THURSDAY INTO
EARLY FRIDAY. THEN, A MUCH MORE IMPRESSIVE CLOSED LOW PRESSURE
SYSTEM WILL MOVE INTO THE PACIFIC NORTHWEST ON FRIDAY, BRINGING
WIDESPREAD PRECIPITATION AND COOLER TEMPERATURES THROUGH THE
WEEKEND. MODEL AGREEMENT IN THE STORM TRACK OF THIS LOW REMAINS
HIGH THROUGH FRIDAY-EARLY SATURDAY, BUT DISAGREEMENT REMAINS ON
HOW LONG THE LOW WILL LINGER OVER THE REGION INTO THE WEEKEND.
AVIATION /06Z SUNDAY THROUGH MONDAY/
ISSUED 1209 AM MDT SUN JUN 21 2026
POSSIBLE MOUNTAIN VALLEY FOG/STRATUS WHERE RECENT RAIN
OCCURRED. OTHERWISE, VFR AND CLEARING SKIES OVERNIGHT. ISOLATED
THUNDERSTORMS DEVELOPING NEAR ID/NV BORDER SUNDAY AFTERNOON.
SURFACE WINDS: VARIABLE 12 KT OR LESS. THEN, W-N 5-15 KT WITH
GUSTS TO 15-20 KT SUNDAY AFTERNOON. WINDS ALOFT AT 10KFT:
WESTERLY 10-20 KT.
KBOI...VFR. CLOUDS CLEARING OVERNIGHT. SURFACE WINDS: VARIABLE OR SE
UP TO 10 KT OVERNIGHT, THEN W-NW 5-15 KT BY LATE SUN MORNING.
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.....SH
SHORT TERM...LC
LONG TERM....SA
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