875
FXUS65 KBOI 250647
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1247 AM MDT THU JUN 25 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- ISOLATED THUNDERSTORMS WILL FOCUS ALONG THE NEVADA BORDER AND
WESTERN MAGIC VALLEY TODAY AND CENTRAL IDAHO MOUNTAINS
THURSDAY, CAPABLE OF PRODUCING STRONG, GUSTY OUTFLOW WINDS.
- A SIGNIFICANT PATTERN CHANGE ARRIVES FRIDAY MORNING AS A COLD
CORE LOW 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 210 PM MDT WED JUN 24 2026
A WEAK SHORTWAVE MOVING ACROSS THE PACIFIC NORTHWEST WILL
INITIATE ISOLATED THUNDERSTORMS THIS AFTERNOON THROUGH THIS
EVENING. THE MAIN FOCUS FOR THESE STORMS WILL BE ALONG THE
NEVADA BORDER AND WESTERN MAGIC VALLEY. GIVEN THE HIGH-BASED
NATURE OF THIS ACTIVITY, STRONG AND GUSTY OUTFLOW WINDS WILL BE
THE PRIMARY THREAT WITH WIND GUSTS UP TO 50 MPH.
ON THURSDAY, THE THREAT OF THUNDERSTORM ACTIVITY SHIFTS INTO
THE CENTRAL IDAHO MOUNTAINS AS MOISTURE INCREASES AHEAD OF THE
NEXT MAJOR WEATHER SYSTEM. ACTIVITY COULD BEGIN EARLY THURSDAY
AS THE SHORTWAVE CONTINUES TO PUSH EAST INTO MONTANA AND
WYOMING. TEMPERATURES LOOK TO BE ABOUT 5 DEGREES COOLER THAN
TODAY.
A SIGNIFICANT PATTERN CHANGE BEGINS IN EARNEST ON FRIDAY AS A
POTENT COLD CORE LOW MOVES INTO THE NORTHWEST, DRAGGING A STRONG
COLD FRONT THROUGH SOUTHEAST OREGON AND SOUTHWEST IDAHO FRIDAY
MORNING. THIS SYSTEM WILL USHER IN WIDESPREAD SHOWERS AND
THUNDERSTORMS ACROSS THE AREA THROUGH FRIDAY NIGHT. LOW LEVELS
WILL TAKE SOME TIME TO SATURATE, BUT WIDESPREAD WETTING RAINS
ARE ANTICIPATED PARTICULARLY ALONG THE FRONTAL BOUNDARY. THERE
IS CURRENTLY A 60% CHANCE FOR THE VALLEYS TO PICK UP OVER A
TENTH OF AN INCH OF RAIN, WHILE THE CENTRAL MOUNTAINS OF IDAHO
COULD SEE HIGHER AMOUNTS UP TO HALF AN INCH. THE BEST CHANCE FOR
THUNDERSTORMS APPEARS TO BE BEHIND THE FRONT FRIDAY AFTERNOON
ACROSS SOUTHEAST OREGON THOUGH THE OVERALL COVERAGE REMAINS
UNCERTAIN. THE STRONGER STORMS COULD PRODUCE BRIEF HEAVY RAIN AS
PW VALUES PEAK TO THE 90TH PERCENTILE. TEMPERATURES ON FRIDAY
WILL DROP SHARPLY, LANDING AROUND 10 DEGREES BELOW NORMAL.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 210 PM MDT WED JUN 24 2026
COOL AND SHOWERY CONDITIONS WILL CONTINUE ON SATURDAY AND
SUNDAY WITH A SLIGHT CHANCE OF THUNDERSTORMS AS THE UPPER LOW
SYSTEM SLOWLY MOVES OVERHEAD. SATURDAY AND SUNDAY WILL SEE THE
HIGHEST CHANCES OF WETTING RAINS, MAINLY OVER HIGHER TERRAIN,
WITH AREA- WIDE TEMPERATURES 15-20 DEGREES BELOW NORMAL.
SIGNIFICANT WEEKEND PRECIPITATION REMAINS POSSIBLE WITH THIS
SYSTEM, DEPENDING ON ITS FINAL TRACK. 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
LESS THAN 0.25 INCH EXPECTED. WITH SNOW LEVELS EXPECTED TO DROP
INTO THE 6500-8000 FT MSL RANGE BY SUNDAY, LIGHT SNOWFALL
REMAINS LIKELY OVER THE WEST-CENTRAL ID MOUNTAINS, WITH
ACCUMULATIONS UP TO 2 INCHES ON THE HIGHEST PEAKS ABOVE 7500 FT
THROUGH SUNDAY MORNING. CONDITIONS DRY OUT WITH BREEZY
CONDITIONS ON MONDAY AND TUESDAY AS THE SYSTEM MOVES NORTHEAST
INTO MANITOBA. THIS SYSTEM WILL KEEP TEMPERATURES BELOW NORMAL
UNDER COOL NORTHWEST FLOW ALOFT. LONG-RANGE GUIDANCE INDICATES A
MOSTLY DRY PACIFIC SHORTWAVE TROUGH DIGGING OVER OUR AREA ON
WEDNESDAY, LIKELY CONTINUING A COOLER NORTHWEST FLOW WITH DRY
CONDITIONS.
AVIATION /06Z THURSDAY THROUGH FRIDAY/
ISSUED 1245 AM MDT THU JUN 25 2026
VFR. ISOLATED VIRGA/LIGHT RAIN SHOWERS THROUGH THU/AM. A LOW CHANCE
OF LIGHTNING (<10% CHANCE) THROUGH THU/AM, MAINLY OVER THE
W-CENTRAL ID MTNS. ISOLATED THUNDERSTORMS DEVELOPING THU/PM,
MAINLY NEAR THE ID/NV BORDER AND W-CENTRAL ID MTNS. INCREASING
CLOUDS AND LOWERING CEILINGS IN E-OREGON LATE IN THE PERIOD,
WITH A COLD FRONT APPROACHING FROM THE WEST. SURFACE WINDS:
BECOMING VARIABLE 6-12 KT OVERNIGHT. THEN W-NW 10-15 KT WITH
LOCALIZED GUSTS TO AROUND 20 KT THU/PM. WINDS ALOFT AT 10KFT
MSL: VARIABLE 5-10 KT.
KBOI...VFR. ISOLATED VIRGA SHOWERS THROUGH THU/AM. INCREASING CLOUDS
AND LOWERING CEILINGS LATE IN THE PERIOD AHEAD OF A COLD FRONT.
SURFACE WINDS: VARIABLE (LEANING NW-SW) 3-8 KT OVERNIGHT, THEN NW 8-
12 KT THU/PM.
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.....NF
SHORT TERM...JDS
LONG TERM....JY
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