751
FXUS65 KBOI 100530
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1130 PM MDT THU JUL 9 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- HEAT ADVISORY FRIDAY AND SATURDAY FOR LOWER ELEVATIONS OF
SOUTHWEST IDAHO AND SOUTHEAST OREGON.
- HOT AND DRY, WITH BREEZY AFTERNOON WINDS THROUGH THE WEEKEND.
- SHOWER AND THUNDERSTORM CHANCES RETURN EARLY NEXT WEEK WITH
THE ARRIVAL OF MONSOON MOISTURE.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 152 PM MDT THU JUL 9 2026
A BROAD UPPER LEVEL HIGH PRESSURE CENTERED OVER THE ROCKY MTNS
WILL EXPAND INTO THE REGION FRIDAY AND SATURDAY. THE RESULTING
WARMING WILL PUSH TEMPERATURES TO AROUND 100 DEGREES ACROSS
LOWER ELEVATIONS, TO INCLUDE THE SNAKE PLAIN AND WEISER RIVER
BASIN. AFTER FRIDAY'S HEAT, WARM OVERNIGHT LOWS FRIDAY NIGHT
WILL LIMIT RECOVERY FOR THOSE WITHOUT A WAY TO COOL DOWN. THE
HEAT PEAKS ON SATURDAY WITH MUCH OF THE ADVISORY AREA REACHING
100-103, WHILE LOCATIONS AROUND GLENNS FERRY PUSH TO 105. WINDS
WILL PICK UP SOME FRIDAY AFTERNOON, WITH THE HEAT LOW ENHANCING
THE EVENING WIND PUSH THROUGH BAKER COUNTY. SATURDAY WILL SEE
BROADER COVERAGE OF BREEZY CONDITIONS AS INCREASING SOUTHWEST
FLOW ALOFT MIXES TO THE SURFACE.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 152 PM MDT THU JUL 9 2026
CONTINUED HOT THROUGH THE PERIOD (4 TO 8 DEGREES ABOVE NORMAL)
UNDER HIGH PRESSURE ALOFT TO OUR EAST ENCOMPASSING THE ENTIRE
GREAT BASIN, ROCKY MOUNTAINS, AND NORTHERN PLAINS STATES. AN
UPPER TROUGH IN THE GULF OF ALASKA WILL BRING GRADUAL COOLING
TUESDAY THROUGH THURSDAY AS IT MOVES ONTO THE NORTHWEST COAST.
SOUTHWEST FLOW ALOFT WILL TRANSPORT MID AND HIGH LEVEL MONSOON
MOISTURE OVER OREGON MONDAY AND TUESDAY, AND IDAHO TUESDAY AND
WEDNESDAY, FOR A SLIGHT CHANCE OF THUNDERSTORMS, WITH INITIAL
STORMS BRINGING GUSTY WINDS AND LITTLE RAIN, AND LATER STORMS
BEING WETTER, ESPECIALLY WEDNESDAY, AS PWAT VALUES CLIMB TO
1.00-1.20 INCH (I.E., 95TH PERCENTILE RELATIVE TO CLIMATOLOGY).
CONCERN WILL GRADUALLY SHIFT FROM FIRE DANGER MONDAY AND TUESDAY
DUE TO LIGHTNING ON DRY FUELS, TO FLASH-FLOOD POTENTIAL BY
WEDNESDAY.
AVIATION /06Z FRIDAY THROUGH SATURDAY/
ISSUED 1130 PM MDT THU JUL 9 2026
VFR. AREAS OF REDUCED VISIBILITY FROM WILDFIRE SMOKE. HIGH DENSITY
ALTITUDE DUE TO HEAT. ISOLATED CONVECTION OVER CENTRAL ID MOUNTAINS
AND SOUTH-CENTRAL ID FRIDAY AFTERNOON. SURFACE WINDS: LIGHT AND
VARIABLE. BECOMING SW-W 10-15 KT WITH GUSTS TO 20-30 KT OVER SE
OREGON AND HIGHER TERRAIN OF SW IDAHO IN THE AFTERNOON. WINDS
ALOFT AT 10KFT MSL: SW 5-15 KT.
KBOI...VFR. HIGH DENSITY ALTITUDE DUE TO HEAT. VISIBILITY REDUCED AT
TIMES BY WILDFIRE SMOKE IN FOOTHILLS NE OF KBOI. SURFACE WINDS:
LIGHT AND VARIABLE OVERNIGHT, THEN SE-S 5-10 KT BY LATE AM.
WEEKEND OUTLOOK...VFR. AREAS OF REDUCED VISIBILITY FROM WILDFIRE
SMOKE. HIGH DENSITY ALTITUDE DUE TO HEAT, ESPECIALLY SATURDAY.
SURFACE WINDS: SW-NW 5-15 KT SAT/SUN. AFTERNOON GUSTS TO 20-30
KT ACROSS E OREGON AND THE SNAKE BASIN IN SW IDAHO SOUTH TO THE
ID/NV BORDER.
BOI WATCHES/WARNINGS/ADVISORIES
ID...HEAT ADVISORY FROM NOON FRIDAY TO 9 PM MDT SATURDAY FOR IDZ012-
014>016-030-033.
OR...HEAT ADVISORY FROM NOON MDT /11 AM PDT/ FRIDAY TO 9 PM MDT /8
PM PDT/ SATURDAY FOR ORZ064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SH
SHORT TERM...DG
LONG TERM....LC
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