992
FXUS65 KBOI 211746
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1146 AM MDT SUN JUN 21 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- DAYTIME TEMPERATURES REMAINING NEAR NORMAL THROUGH SUNDAY,
THEN WARMING TO AROUND 10 DEGREES ABOVE NORMAL TUESDAY THROUGH
THURSDAY.
- BREEZY AFTERNOONS OVER THE NEXT SEVERAL DAYS.
- COOLER AND UNSETTLED CONDITIONS POSSIBLE NEXT WEEKEND.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 357 AM MDT SUN JUN 21 2026
AN UPPER LEVEL TROUGH WILL REMAIN OVER ALBERTA OVER THE NEXT
SEVERAL DAYS WITH WEST-NORTHWEST FLOW ON SUNDAY. ISOLATED
SHOWERS AND THUNDERSTORMS WILL FORM OVER THE CENTRAL ID
MOUNTAINS AND SOUTHERN TWIN FALLS COUNTY ALONG THE NV BORDER
THIS AFTERNOON. BREEZY WEST-NORTHWEST WINDS THIS AFTERNOON AND
AGAIN ON MONDAY AFTERNOON. THE SYSTEM OVER ALBERTA WILL SLOWLY
MOVE EAST AND UPPER LEVEL RIDGING WILL BRING WARMER
TEMPERATURES BY TUESDAY WITH TEMPERATURES WARMING TO AROUND 10
DEGREES ABOVE NORMAL. SUBTROPICAL MOISTURE WILL BEGIN TO GET
INJECTED INTO THE UPPER LEVEL RIDGE AFTER TUESDAY, BUT WESTERLY
FLOW WILL KEEP THE DEEPER MOISTURE TO THE SOUTH AND EAST OF OUR
AREA.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 357 AM MDT SUN JUN 21 2026
DRY AND WARM CONDITIONS CONTINUE INTO THURSDAY, WITH SUBTROPICAL
MOISTURE REMAINING SOUTH AND EAST OF THE AREA. SOME SHOWERS AND
THUNDERSTORMS MAY FORM IN THE CENTRAL ID MOUNTAINS AND SOUTH
ALONG THE NV BORDER THURSDAY AFTERNOON. AN UPPER LEVEL TROUGH
FROM THE GULF OF ALASKA WILL MOVE SOUTHEAST INTO THE PACIFIC NW
LATE THURSDAY. A COLD FRONT MOVES THROUGH SOUTHEAST OR AND
SOUTHWEST ID ON FRIDAY WITH COOLER AND UNSETTLED CONDITIONS
POSSIBLE SATURDAY AND SUNDAY. STILL SIGNIFICANT MODEL
DIFFERENCES IN THE POSITIONING OF THIS TROUGH, BUT WETTING RAINS
POSSIBLE NEXT WEEKEND AND MUCH COOLER TEMPERATURES AS MUCH AS
10-20 DEGREES BELOW NORMAL.
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. 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...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SA
SHORT TERM...KA
LONG TERM....KA
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