358
FXUS65 KBOI 231803
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1203 PM MDT TUE JUN 23 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- TEMPERATURES AROUND 5 TO 10 DEGREES ABOVE NORMAL THROUGH
THURSDAY.
- SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS TUESDAY AND WEDNESDAY
SOUTH ALONG THE NV BORDER, BUT OUTFLOW WINDS MAY REACH
SOUTHERN MALHEUR, HARNEY, OWYHEE AND TWIN FALLS COUNTIES.
- MAJOR CHANGE BEGINNING FRIDAY WITH ARRIVAL OF A COLD FRONT AND
SHOWERS, FOLLOWED BY GUSTY WINDS, SHOWERS AND CHANCE OF
THUNDERSTORMS THROUGH SUNDAY. SNOW POSSIBLE AS LOW AS 6500-7000
FEET MSL SATURDAY NIGHT AND SUNDAY.
SHORT TERM /THROUGH THURSDAY NIGHT/
ISSUED 428 AM MDT TUE JUN 23 2026
AN UPPER LEVEL RIDGE WILL CONTINUE TO EXPAND OVER THE REGION
WITH MID LEVEL MOISTURE MOVING OVER THE AREA THROUGH THE SHORT
TERM. TEMPERATURES WILL REMAIN AROUND 5 TO 10 DEGREES ABOVE
NORMAL. A PAIR OF DISORGANIZED SHORTWAVES WILL MOVE ACROSS THE
PACIFIC NW BRINGING INCREASED CLOUDS, ISOLATED SHOWERS AND
THUNDERSTORMS. THE FIRST WAVE MOVES ACROSS THE PACIFIC NW LATE
THIS AFTERNOON, WITH INCREASING HIGH CLOUDS AND ISOLATED SHOWERS
AND THUNDERSTORMS IN EASTERN OR ALONG THE NV BORDER THIS
AFTERNOON. THE SYSTEM WILL MOVE OVER IDAHO OVERNIGHT, BRINGING A
CHANCE OF SPRINKLES OVERNIGHT INTO WEDNESDAY MORNING. ISOLATED
SHOWERS LINGER NEAR THE NV/ID BORDER ON WEDNESDAY MORNING,
GENERALLY SOUTH OF TWIN FALLS. SIMILAR CONDITIONS EXPECTED
WEDNESDAY WITH MORE SHOWER COVERAGE ALONG THE NV BORDER AND
INCREASING CLOUDS DURING THE AFTERNOON. THE MAIN SHORTWAVE
TRACKS OVER THE REGION OVERNIGHT WEDNESDAY INTO THURSDAY MORNING
WITH LIGHT RAIN SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
CLOUDS CLEAR OUT MIDDAY THURSDAY BEFORE INCREASING CLOUDS LATE
FROM THE NEXT SYSTEM MOVING IN FROM THE GULF OF ALASKA.
LONG TERM /FRIDAY THROUGH TUESDAY/
ISSUED 428 AM MDT TUE JUN 23 2026
AN UPPER LEVEL TROUGH FROM THE GULF OF ALASKA WILL MOVE
SOUTHEAST INTO THE PACIFIC NW. A COLD FRONT MOVES THROUGH
SOUTHEAST OR AND SOUTHWEST ID ON FRIDAY WITH COOLER AND
UNSETTLED CONDITIONS THROUGH SATURDAY AND SUNDAY. SIGNIFICANT
PRECIPITATION POSSIBLE WITH THIS SYSTEM IF THE TROUGH MOVES
OVERHEAD. STILL SIGNIFICANT MODEL DIFFERENCES THOUGH IN THE
POSITIONING OF THIS TROUGH, BUT WETTING RAINS POSSIBLE SATURDAY
AND SUNDAY WITH TEMPERATURES AS MUCH AS 10-20 DEGREES BELOW
NORMAL. LIGHT SNOW POSSIBLE ON THE PEAKS ABOVE 7000 FEET 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.
AVIATION /18Z TUESDAY THROUGH WEDNESDAY/
ISSUED 1129 AM MDT TUE JUN 23 2026
VFR AND PATCHY SMOKE OVER TREASURE VALLEY AREAS. HIGH DENSITY
ALTITUDE DURING THE AFTERNOON DUE TO HEAT. ISOLATED
SHOWERS/THUNDERSTORMS NEAR OR/NV BORDER IN THE LATE AFTERNOON
THROUGH EVENING, WHICH MAY PRODUCE GUSTY OUTFLOWS UP TO 35 KT OVER
SE OR. SURFACE WINDS: VARIABLE OR E-SE 5-15 KT BECOMING NW-NE 5-15
KT IN THE AFTERNOON. WINDS ALOFT AT 10KFT MSL: W-NW 10-20 KT, THEN S-
SW 5-15 KT IN THE AFTERNOON.
KBOI...VFR. HIGH DENSITY ALTITUDE DURING AFTERNOON FROM HEAT.
SURFACE WINDS: SE 5-10 KT BECOMING NW 5-15 KT IN THE AFTERNOON AFTER
20Z.
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.....JY
SHORT TERM...KA
LONG TERM....KA
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