495
FXUS65 KBOI 071731
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1131 AM MDT TUE JUL 7 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS THIS AFTERNOON
AND EVENING, MAINLY ACROSS THE HIGHER TERRAIN OF FAR SOUTHERN
OREGON AND IDAHO. STORMS MAY PRODUCE GUSTY OUTFLOW WINDS,
POSSIBLY MOVING THROUGH THE TREASURE AND MAGIC VALLEYS.
- ISOLATED TO SCATTERED THUNDERSTORMS WEDNESDAY ACROSS THE
HIGHER TERRAIN OF CENTRAL AND SOUTHERN IDAHO.
- HOT TEMPERATURES THROUGH THE WEEK AND INTO THE WEEKEND.
- BREEZY WINDS EACH AFTERNOON, ESPECIALLY WEDNESDAY AND THURSDAY.
SHORT TERM /THROUGH THURSDAY NIGHT/
ISSUED 350 AM MDT TUE JUL 7 2026
SOUTHWEST FLOW ALOFT WILL BRING ADDITIONAL MID-LEVEL MOISTURE
INTO SOUTHERN AREAS TODAY. DAYTIME HEATING WILL INCREASE
INSTABILITY, WITH SHOWERS AND THUNDERSTORMS DEVELOPING OVER THE
HIGHER TERRAIN NEAR THE NEVADA BORDER THIS AFTERNOON. WITH DRY
LOWER LEVELS, THUNDERSTORMS MAY PRODUCE OUTFLOW WIND GUSTS 40-60
MPH. THE STRONGEST STORMS MAY ALSO PRODUCE BRIEF HEAVY RAIN AND
SMALL HAIL. STORMS WILL LIFT NORTHEAST OFF THE HIGHER TERRAIN
SOUTH OF THE SNAKE RIVER AND WEAKEN AS THEY ENTER THE SNAKE
RIVER VALLEY. HOWEVER, GUSTY OUTFLOW WINDS ARE POSSIBLE AS
STORMS DISSIPATE IN BOTH THE TREASURE AND MAGIC VALLEYS LATE
THIS AFTERNOON AND EVENING, WITH AROUND A 20% CHANCE OF STORMS
HOLDING TOGETHER INTO THE VALLEYS. OTHERWISE TODAY, EXPECT A 3-6
DEGREE RISE IN TEMPERATURES FROM YESTERDAY, EXCEPT A BIGGER
WARMUP IN PORTIONS OF EASTERN OREGON AND THE WEST-CENTRAL IDAHO
MOUNTAINS WHERE CLOUDS AND SHOWERS HELD TEMPERATURES DOWN.
LOWER ELEVATIONS SHOULD REACH THE MID TO UPPER 90S, WITH 80S TO
LOWER 90S IN MOUNTAIN VALLEYS. OUTSIDE OF STORMS, WINDS WILL BE
RELATIVELY LIGHT.
AN UPPER LEVEL TROUGH MOVING INTO BRITISH COLUMBIA ON WEDNESDAY
WILL BEGIN TO PUSH MOISTURE TO THE EAST. THIS WILL LIMIT THE
CHANCE FOR AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS TO
THE HIGHER TERRAIN OF SOUTHERN AND CENTRAL IDAHO, ALTHOUGH
THUNDERSTORMS AND OUTFLOW GUSTS MAY ALSO DRIFT NORTH INTO THE
MAGIC VALLEY. A WEAK, DRY COLD FRONT WILL MOVE THROUGH WEDNESDAY
NIGHT AND THURSDAY. TEMPERATURES WILL REMAIN STEADY ON
WEDNESDAY, THEN COOL A FEW DEGREES THURSDAY BEHIND THE FRONT.
THE FRONT WILL BRING GUSTY WINDS TO THE AREA WEDNESDAY NIGHT,
CONTINUING INTO THURSDAY ACROSS SOUTHERN IDAHO WITH GUSTS 20-35
MPH. LOW HUMIDITY WITH GUSTY WINDS WILL INCREASE FIRE WEATHER
CONCERNS.
LONG TERM /FRIDAY THROUGH TUESDAY/
ISSUED 350 AM MDT TUE JUL 7 2026
A STRONG RIDGE OF HIGH PRESSURE WILL BUILD NORTH ACROSS THE
GREAT BASIN ON FRIDAY, THEN EXPAND ACROSS THE ROCKY MOUNTAINS
AND NORTHERN PLAINS OVER THE WEEKEND INTO EARLY NEXT WEEK. THIS
WILL BRING HOTTER TEMPERATURES WITH LOWER ELEVATIONS REACHING
THE UPPER 90S TO AROUND 100 DEGREES EACH DAY. THE HOTTEST
TEMPERATURES ARE EXPECTED TO REMAIN TO OUR EAST AS AN UPPER
TROUGH SITS OFF THE PACIFIC NORTHWEST COAST. HOWEVER, EVEN A
SLIGHT SHIFT WEST OF THE RIDGE WOULD BRING EVEN HOTTER
TEMPERATURES WITH HIGHS ABOVE 100 DEGREES AT LOWER ELEVATIONS.
SOUTHWEST FLOW ALOFT WILL BRING BREEZY AFTERNOON AND EVENING
WINDS TO HIGHER ELEVATIONS EACH DAY. MONSOONAL MOISTURE WILL
BEGIN TO WORK ITS WAY NORTH AROUND THE PERIPHERY OF THE RIDGE
MONDAY AND TUESDAY, REINTRODUCING A THREAT OF SHOWERS AND
THUNDERSTORMS.
AVIATION /18Z TUESDAY THROUGH WEDNESDAY/
ISSUED 1131 AM MDT TUE JUL 7 2026
MAINLY VFR. HIGH DENSITY ALTITUDE THIS AFTERNOON DUE TO HEAT.
ISOLATED TO SCATTERED SHOWERS/THUNDERSTORMS DEVELOPING THIS
AFTERNOON, PRIMARILY NEAR THE ID/NV BORDER AND HIGHER TERRAIN.
THUNDER CAPABLE OF 30-50 KT OUTFLOWS, WITH BRIEF BLOWING DUST
POSSIBLE. LOCALIZED TERRAIN OBSCURATION FROM WILDFIRE SMOKE.
SURFACE WINDS OUTSIDE OF STORMS: VARIABLE UNDER 10 KT. WINDS
ALOFT AT 10KFT MSL: SW-W 5-15 KT.
KBOI...VFR. A 30% CHANCE OF GUSTS TO 20-30 KT LATE THIS
AFTERNOON FROM DISSIPATING SHOWERS/STORMS. VISIBILITY REDUCTIONS
DUE TO NEARBY WILDFIRE SMOKE POSSIBLE TONIGHT. FOOTHILLS
OBSCURED IN SMOKE. HIGH DENSITY ALTITUDE THIS AFTERNOON DUE TO
HEAT. SURFACE WINDS: NW 5-10 KT THIS AFTERNOON THEN SE 5-15 KT
TONIGHT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING FOR IDZ423-426.
OR...RED FLAG WARNING UNTIL 8 PM PDT THIS EVENING FOR ORZ672.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....NF
SHORT TERM...ST
LONG TERM....ST
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