676
FXUS65 KBOI 051834
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1234 PM MDT WED AUG 5 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- WARMING TREND WILL BRING TEMPERATURES NEAR TO ABOVE 100
DEGREES BY THURSDAY THROUGH THE WEEKEND.
- BREEZY WINDS FRIDAY THROUGH THE WEEKEND WITH VERY LOW
PRECIPITATION CHANCES RETURNING ALONG THE ID/NV BORDER.
- SMOKY CONDITIONS CONTINUE THROUGH THE WEEK.
SHORT TERM /THROUGH FRIDAY NIGHT/
ISSUED 353 AM MDT WED AUG 5 2026
CONTINUED AMPLIFICATION OF THE DESERT SOUTHWEST UPPER-LEVEL
RIDGE IS EXPECTED OVER THE AREA THROUGH THE SHORT TERM. THIS
WILL CONTINUE THE TREND OF HOTTER AND DRIER WEATHER, WITH EACH
CONSECUTIVE DAY WARMING A FEW DEGREES FROM THE PREVIOUS DAY. BY
FRIDAY AFTERNOON, TEMPERATURES 100-105 ARE FORECAST TO BE
WIDESPREAD IN ELEVATIONS BELOW 5000 FT MSL. OVERNIGHT MINIMUM
TEMPERATURES WILL ALSO BE A CONCERN FOR THESE LOWER ELEVATIONS,
WITH REDUCED RELIEF FROM TEMPERATURES ONLY COOLING TO THE MID
60S TO EVEN LOCALIZED 70 DEGREES OVERNIGHT. LOCALIZED DENSE
SMOKE CONDITIONS COULD STAND TO TEMPER THESE BY A FEW DEGREES,
BUT WIDESPREAD HEAT IMPACTS ARE EXPECTED THURSDAY AND ESPECIALLY
FRIDAY. SPEAKING OF SMOKE, CONTINUED EFFECTS ARE EXPECTED OVER
THE NEXT FEW DAYS. AIR QUALITY ALERTS ARE ONGOING FOR SOUTHEAST
OREGON AND SOUTHWEST IDAHO AND ARE IN EFFECT UNTIL AT LEAST
THURSDAY. SOME MILD IMPROVEMENT TO SMOKE IS EXPECTED EACH DAY AS
MIXING OCCURS IN THE AFTERNOON FROM DIURNAL HEATING AND
AFTERNOON BREEZINESS.
LONG TERM /SATURDAY THROUGH WEDNESDAY/
ISSUED 353 AM MDT WED AUG 5 2026
STRONGER WESTERLY FLOW ALOFT WILL MOVE INTO THE AREA AS UPPER-
LEVEL TROUGHING BUILDS OFFSHORE AND THE DESERT SOUTHWEST RIDGE
FLATTENS AND WEAKENS. WHILE HOT TEMPERATURES WILL CONTINUE,
INCREASED WINDS AND THE LOW POSSIBILITY OF PRECIPITATION RETURN
TO THE FORECAST. CURRENT LONG RANGE MODELS KEEP THE
PRECIPITATION PRIMARILY IN FAR SOUTHERN ID & ALONG THE ID/NV
BORDER, WHICH WOULD MANIFEST ITSELF THROUGH AFTERNOON
THUNDERSTORMS. PRECIPITATION CHANCES GENERALLY INCREASE DAY
OVER DAY AS MONSOONAL MOISTURE IS TRANSPORTED NORTH. FOR NOW,
IT LOOKS AS THOUGH THE REST OF THE GREAT BASIN AND DESERT
SOUTHWEST WILL RECEIVE THE PRECIPITATION, BUT OUR REGION IS ON
THE CUSP. TEMPERATURES WILL BE 5-10 DEGREES ABOVE NORMAL WITH
LOWER VALLEYS NEAR 100 DEGREES SATURDAY, DECREASING TO NEAR
NORMAL / ABOUT 5 DEGREES ABOVE NORMAL SUNDAY ONWARD. BREEZY
WINDS AND HOT TEMPERATURES WILL CREATE FIRE WEATHER CONCERNS.
SMOKY CONDITIONS WILL CONTINUE FROM AREA WILDFIRES WHICH MAY
KEEP TEMPERATURES SLIGHTLY COOLER THAN FORECAST.
AVIATION /18Z WEDNESDAY THROUGH THURSDAY/
ISSUED 1231 PM MDT WED AUG 5 2026
REDUCED VISIBILITY DUE TO WILDFIRE SMOKE, WITH AREAS OF MVFR-IFR AND
MOUNTAIN OBSCURATION, OTHERWISE LOW VFR. HIGH DENSITY ALTITUDE
DURING AFTERNOON DUE TO HEAT. SURFACE WINDS: VARIABLE 5-10 KT.
WINDS ALOFT AT 10KFT MSL: W-NW 5-15 KT SHIFTING TO SW 5-15KT BY
18Z/THU.
KBOI...LOW VFR DUE TO WILDFIRE SMOKE. SURFACE WINDS: NW 5-10KT
BECOMING SE 5-10KT AFTER SUNSET.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR QUALITY ALERT UNTIL 2 PM MDT FRIDAY FOR IDZ011>015-028-029-
033.
HEAT ADVISORY FROM 2 PM THURSDAY TO 9 PM MDT SATURDAY FOR
IDZ012-014>016-029-030-033.
AIR QUALITY ALERT UNTIL 1 PM MDT THURSDAY FOR IDZ016-030.
OR...HEAT ADVISORY FROM 2 PM MDT /1 PM PDT/ THURSDAY TO 9 PM MDT /8
PM PDT/ SATURDAY FOR ORZ061>064.
AIR QUALITY ALERT UNTIL 1 PM MDT /NOON PDT/ THURSDAY FOR
ORZ061>064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....KA
SHORT TERM...CH
LONG TERM....CH
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