526
FXUS65 KBOI 091952
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
152 PM MDT THU JUL 9 2026
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/
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/
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 /18Z THURSDAY THROUGH FRIDAY/
ISSUED 1117 AM MDT THU JUL 9 2026
VFR. AREAS OF REDUCED VISIBILITY FROM WILDFIRE SMOKE. HIGH
DENSITY ALTITUDE DUE TO HEAT. SURFACE WINDS: W-NW 5-15 KT, WITH
GUSTS 20-25 KT FROM KMUO TO KTWF/KJER 09/20Z UNTIL 10/00Z. WINDS
ALOFT AT 10KFT MSL: S-W 5-15 KT.
KBOI...VFR. HIGH DENSITY ALTITUDE DUE TO HEAT. VISIBILITY
REDUCED AT TIMES BY WILDFIRE SMOKE IN FOOTHILLS N AND NE OF
KBOI. SURFACE WINDS: W-N 5-12 KT. GUSTS 15-20KT 09/20Z UNTIL
10/00Z.
WEEKEND OUTLOOK...VFR. AREAS OF REDUCED VISIBILITY FROM WILDFIRE
SMOKE. ISOLATED CONVECTION OVER CENTRAL ID MOUNTAINS FRIDAY.
HIGH DENSITY ALTITUDE DUE TO HEAT, ESPECIALLY SATURDAY. SURFACE
WINDS: SW-NW 5-15 KT FRIDAY THROUGH SUNDAY. 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
SHORT TERM...DG
LONG TERM....LC
AVIATION.....LC
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page