883
FXUS65 KBOI 251800
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1200 PM MDT THU JUN 25 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- ISOLATED SHOWERS AND THUNDERSTORMS THIS MORNING IN THE CENTRAL
ID MOUNTAINS.
- A SIGNIFICANT PATTERN CHANGE ARRIVES FRIDAY AS A COOL UPPER
LEVEL TROUGH PUSHES A COLD FRONT THROUGH, BRINGING WIDESPREAD
SHOWERS AND COOLER TEMPERATURES.
- TEMPERATURES AROUND 15 TO 20 DEGREES BELOW NORMAL SATURDAY AND
SUNDAY.
- SIGNIFICANT PRECIPITATION AND LIGHT SNOW ABOVE 7000 FEET POSSIBLE
SATURDAY THROUGH SUNDAY.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 419 AM MDT THU JUN 25 2026
A WEAK SHORTWAVE IS MOVING OVER THE AREA THIS MORNING WITH
ISOLATED SHOWERS EXTENDING FROM THE OWYHEE MOUNTAINS TO THE
BOISE MOUNTAINS THIS MORNING. SHOWERS MAY PRODUCE BRIEF GUSTY
WINDS THIS MORNING. THESE SHOWERS WILL MOVE EAST BY MID MORNING
WITH PARTIAL CLEARING AND ANOTHER WARM DAY THIS AFTERNOON. THE
UPPER LEVEL TROUGH OFF THE PACIFIC NW COAST WILL BRING INCREASED
CLOUDS LATE THIS AFTERNOON AND EVENING. GENERALLY CLOUDY SKIES
WITH VIRGA AND GUSTY WINDS THIS EVENING AS IT TAKES SOME TIME TO
MOISTEN UP THE LOWER LEVELS OF THE ATMOSPHERE. SHOWERS BECOME
WIDESPREAD ON FRIDAY MORNING IN EASTERN OR AND SPREAD ACROSS
SOUTHWEST ID BY MIDDAY. THEN PARTIAL CLEARING EXPECTED FRIDAY
AFTERNOON AS COOLER AIR ALOFT MOVES OVERHEAD. THIS WILL LEAD TO
UNSTABLE CONDITIONS WITH SCATTERED SHOWERS AND THUNDERSTORMS
DURING THE AFTERNOON. SHOWERS CONTINUE INTO SATURDAY WITH
ISOLATED THUNDERSTORMS. BREEZY NORTHWEST WINDS CONTINUE BEHIND
THE COLD FRONT. TEMPERATURES LOWER TO AROUND 15 TO 20 DEGREES
BELOW NORMAL SATURDAY. SIGNIFICANT PRECIPITATION POSSIBLE WITH
THIS SYSTEM, BUT WILL BE SHOWERY IN NATURE, AND DEPENDING ON
WHERE THE TRACK OF THE SYSTEM GOES. AS IT STANDS RIGHT NOW,
PRECIPITATION AMOUNTS OF UP TO 1 TO 1.25 INCH POSSIBLE OVER THE
CENTRAL ID MOUNTAINS, WITH LESSER AMOUNTS IN EASTERN OR, WHERE
0.25-0.5 INCH EXPECTED. SNAKE PLAIN WILL GENERALLY SEE 0.25 TO
0.5 INCH.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 419 AM MDT THU JUN 25 2026
COOL AND SHOWERY CONDITIONS CONTINUE SUNDAY WITH A SLIGHT
CHANCE OF THUNDERSTORMS AS THE TROUGH SLOWLY MOVES OVERHEAD AND
NORTHEAST. TEMPERATURES REMAIN AROUND 15 TO 20 DEGREES BELOW
NORMAL SUNDAY. LIGHT SNOW POSSIBLE ON THE PEAKS ABOVE 7000 FEET
SUNDAY MORNING. CONDITIONS DRY OUT WITH BREEZY AND CONTINUED
COOL CONDITIONS ON MONDAY. MODELS ARE NOW TRENDING TOWARD
KEEPING UNSETTLED CONDITIONS THROUGH WEDNESDAY, WITH A WEAK
SHORTWAVE MOVING OVER NORTHEAST OR ON TUESDAY, AND SHOWERS
FAVORING THE MOUNTAINS. BELOW NORMAL TEMPERATURES EXPECTED
THROUGH WEDNESDAY BUT TEMPERATURES SLOWLY WARM TO NEAR NORMAL BY
THURSDAY AS CONDITIONS DRY OUT.
AVIATION /18Z THURSDAY THROUGH FRIDAY/
ISSUED 1200 PM MDT THU JUN 25 2026
INCREASING CLOUDS, WITH VIRGA AND SHOWERS DEVELOPING LATE DUE
TO COLD FRONT APPROACHING FROM THE WEST. SHOWERS CONTINUING INTO
FRIDAY AM, THEN WIDELY SCATTERED SHOWERS/THUNDERSTORMS FRIDAY
PM. STORMS CAPABLE OF OUTFLOWS TO 30-45 KT, SMALL HAIL, BRIEF
HEAVY RAIN. BRIEF MVFR/IFR POSSIBLE IN HEAVY RAIN, ESP OVER
MTNS. MTNS OBSCURED IN PRECIP. SURFACE WINDS: SW-NW 10-20 KT,
AND NW 10-20 KT TONIGHT. GUSTY WINDS TO 20-35 KT WITH VIRGA AND
ONSET OF SHOWERS LATE. WINDS ALOFT AT 10KFT MSL: W-SW 10-30 KT.
KBOI...VFR. VIRGA AND VICINITY SHOWERS LATE TONIGHT, THEN
FREQUENT RAIN SHOWERS BEGIN APPROX FRI/13Z WITH COLD FRONT.
THUNDERSTORM CHANCES INCREASE (30%) FRIDAY AFTERNOON.
THUNDERSTORMS CAPABLE OF OUTFLOWS TO 30-45 KT, SMALL HAIL, BRIEF
HEAVY RAIN. SURFACE WINDS: W-N 5-15 KT, GUSTS AROUND 25 KT WITH
VIRGA/SHOWERS/COLD FRONT OVERNIGHT THROUGH FRI MORNING.
WEEKEND OUTLOOK...SHOWERS AND THUNDERSTORMS SATURDAY AND
SUNDAY. BRIEF MVFR/IFR POSSIBLE IN HEAVY RAIN OR SNOW, ESP OVER
MTNS. MOUNTAINS OBSCURED. SNOW LEVELS TEMPORARILY LOWERING TO
6500-7500FT MSL SUNDAY MORNING. GUSTY WEST-NORTHWEST SURFACE
WINDS DURING THE AFTERNOONS.
BOI WATCHES/WARNINGS/ADVISORIES
ID...FIRE WEATHER WATCH FROM FRIDAY AFTERNOON THROUGH LATE FRIDAY
NIGHT FOR IDZ400-420-423-424-426.
OR...FIRE WEATHER WATCH FROM FRIDAY AFTERNOON THROUGH LATE FRIDAY
NIGHT FOR ORZ670>674.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SH
SHORT TERM...KA
LONG TERM....KA
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