119
FXUS65 KBOI 202349
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
549 PM MDT SAT JUN 20 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 MONDAY 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 /TUESDAY THROUGH SATURDAY/
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 /00Z SUNDAY THROUGH MONDAY/
ISSUED 548 PM MDT SAT JUN 20 2026
VFR. SCATTERED SHOWERS AND THUNDERSTORMS NEAR NV BORDER, AND
ISOLATED IN W-CENTRAL IDAHO. OUTFLOW WINDS 25-40 KT, BRIEF
HEAVY RAIN, SMALL HAIL, AND LIGHTNING ARE THE MAIN HAZARDS.
MOUNTAIN OBSCURATION IN MOUNTAIN SHOWERS. CLEARING SKIES
OVERNIGHT THROUGH SUNDAY. SURFACE WINDS: W-NW 5-15 KT WITH GUSTS
20-30 KT. THEN, VARIABLE UP TO 12 KT AFTER SUNSET. WINDS ALOFT
AT 10KFT: WESTERLY 10-20 KT.
KBOI...VFR. CLOUDS CLEARING OVERNIGHT. SURFACE WINDS: N-NE 5-10
KT, THEN VARIABLE OR LIGHT SE OVERNIGHT.
SUNDAY OUTLOOK...VFR. ISOLATED AFTERNOON CONVECTION NEAR ID/NV
BORDER. SURFACE WINDS: W-N 5-15 KT WITH PM GUSTS TO 15-20 KT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...RED FLAG WARNING UNTIL 6 PM MDT THIS EVENING FOR IDZ423-426.
OR...RED FLAG WARNING UNTIL 5 PM PDT THIS AFTERNOON 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...LC
LONG TERM....SA
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page