389
FXUS65 KBOI 050954
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
354 AM MDT SUN JUL 5 2026
KEY MESSAGES
- HOT TEMPERATURES THROUGH THE WEEK, POTENTIALLY BECOMING VERY
HOT NEXT WEEKEND.
- ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS TODAY THROUGH
TUESDAY MAINLY OVER HIGHER TERRAIN, WITH LIGHTNING, GUSTY
OUTFLOW WINDS, BRIEF HEAVY RAIN, AND SMALL HAIL POSSIBLE.
- BREEZY WINDS EACH AFTERNOON.
SHORT TERM /THROUGH TUESDAY NIGHT/
ANOTHER HOT DAY IS IN STORE ACROSS OUR AREA TODAY AS A RIDGE OF
HIGH PRESSURE CENTERED TO OUR EAST STRENGTHENS AND THE FLOW
ALOFT BECOMES SOUTHERLY. HIGHS IN MOST AREAS WILL BE A COUPLE
DEGREES WARMER THAN YESTERDAY, WITH LOWER ELEVATIONS REACHING
THE MID TO UPPER 90S AND MOUNTAIN VALLEYS IN THE 80S TO LOWER
90S. THE SOUTHERLY FLOW WILL ALSO BRING IN MID-LEVEL MOISTURE
INTO OUR AREA, PRIMARILY ACROSS SOUTHEAST OREGON AHEAD OF A
SHORTWAVE TROUGH LIFTING NORTH OUT OF WESTERN NEVADA. INCREASED
MOISTURE AND THE TROUGH WILL BRING ISOLATED TO SCATTERED SHOWERS
AND THUNDERSTORMS TO SOUTHEAST OREGON AND THE OWYHEE MOUNTAINS
OF SOUTHWEST IDAHO LATE THIS AFTERNOON AND EVENING. DUE TO
LIMITED MOISTURE AND DRY LOW-LEVELS, THE PRIMARY HAZARDS WILL BE
LIGHTNING AND GUSTY OUTFLOW WINDS TO 50 MPH. OUTSIDE OF STORMS,
EXPECT BREEZY AFTERNOON AND EVENING WINDS WITH GUSTS 20-35 MPH.
ISOLATED TO SCATTERED SHOWERS WITH EMBEDDED THUNDERSTORMS WILL
EXPAND INTO SOUTHWEST IDAHO SUNDAY NIGHT INTO MONDAY MORNING AS
THE TROUGH MOVES ACROSS OUR AREA. ACTIVITY WILL INCREASE IN THE
AFTERNOON ACROSS THE WEST-CENTRAL IDAHO MOUNTAINS NEAR THE
CENTER OF THE TROUGH. ENOUGH MOISTURE WILL LINGER ACROSS THE
HIGHER TERRAIN OF SOUTHEAST OREGON AND FAR SOUTHWEST IDAHO FOR
ADDITIONAL AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS. SLIGHTLY
DEEPER MOISTURE IN PLACE ON MONDAY WILL ALLOW FOR BRIEF HEAVY
RAINFALL AND SMALL HAIL IN STRONGER STORMS, IN ADDITION TO
LIGHTNING AND GUSTY WINDS. HIGHS MONDAY WILL COOL 3-5 DEGREES
BEHIND THE TROUGH WITH CONTINUED BREEZY CONDITIONS. ON TUESDAY,
TEMPERATURES WILL REBOUND UNDER SOUTHWESTERLY FLOW ALOFT.
DAYTIME INSTABILITY WILL BRING A 10-30% CHANCE OF SHOWERS AND
THUNDERSTORMS TO THE HIGHER TERRAIN.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
AN UPPER TROUGH MOVING BY TO OUR NORTH WILL BRING WESTERLY FLOW
ALOFT WEDNESDAY AND THURSDAY. THIS WILL PUSH MOISTURE TO THE
EAST, ENDING THE THREAT FOR SHOWERS AND THUNDERSTORMS AFTER
WEDNESDAY. EXPECT BREEZY CONDITIONS WITH TEMPERATURES COOLING A
FEW DEGREES BY THURSDAY. FOR FRIDAY INTO THE WEEKEND, A RIDGE
OVER THE FOUR CORNERS WILL STRENGTHEN AND BUILD NORTH WHILE A
TROUGH DEEPENS OFF THE COAST. SOUTHWEST FLOW WILL BRING
INCREASING TEMPERATURES AND BREEZY CONDITIONS. CURRENTLY,
ENSEMBLES SLIGHTLY FAVOR SOME INFLUENCE FROM THE TROUGH,
MODERATING TEMPERATURES SOMEWHAT. HOWEVER, IF THE RIDGE BUILDS
FURTHER WEST, VERY HOT TEMPERATURES WOULD DEVELOP ACROSS THE
AREA OVER THE WEEKEND, WITH HIGHS OVER 100 DEGREES ACROSS LOWER
ELEVATIONS.
AVIATION /06Z SUNDAY THROUGH MONDAY/
ISSUED 1219 AM MDT SUN JUL 5 2026
VFR. ISOLATED THUNDERSTORMS OVER SE OREGON, FAR SW IDAHO, AND
THE CENTRAL IDAHO MOUNTAINS SUNDAY LATE AFTERNOON AND EVENING.
THUNDERSTORMS CAPABLE OF PRODUCING GUSTY OUTFLOWS UP TO 50 KT.
HIGH DENSITY ALTITUDE SUNDAY AFTERNOON/EVENING DUE TO HEAT.
SURFACE WINDS: SW-NW 5-15 KT THIS EVENING. NW VALLEY GUSTS 15-25
KT FROM KBKE TO KONO THIS EVENING. OTHERWISE, MOSTLY VARIABLE
UNDER 12 KT OVERNIGHT THROUGH SUNDAY MORNING. WINDS ALOFT AT
10KFT MSL: SW 10-20 KT.
KBOI...VFR UNDER CLEAR SKIES OVERNIGHT THROUGH MORNING. HIGH
DENSITY ALTITUDE SUNDAY AFTERNOON/EVENING DUE TO HEAT. SURFACE
WINDS: SE OR VARIABLE LESS THAN 10 KT OVERNIGHT THROUGH SUNDAY
MORNING, BECOMING NW 7-12 KT WITH GUSTS UP TO 20 KT IN THE
AFTERNOON.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...ST
LONG TERM....ST
AVIATION.....JY
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page