848
FXUS65 KBOI 210957
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
357 AM MDT SUN JUN 21 2026
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/
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/
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 /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
SHORT TERM...KA
LONG TERM....KA
AVIATION.....SH
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