145
FXUS65 KBOI 261643
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1043 AM MDT SUN JUL 26 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- WARM AND DRY CONDITIONS WILL PERSIST OVER THE NEXT SEVERAL
DAYS.
- SMOKY CONDITIONS AT TIMES.
- SLIGHTLY COOLER WITH NEAR-NORMAL TEMPERATURES THROUGH
MIDWEEK.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 331 AM MDT SUN JUL 26 2026
STRONG SOUTHWEST FLOW ALOFT WILL STEER SOME REMNANT MONSOONAL
MOISTURE ACROSS THE EASTERNMOST PORTIONS OF OUR AREA OVER
SOUTHWEST ID. THIS PATTERN WILL CONTINUE CHANCES OF
SHOWERS/THUNDERSTORMS THROUGH THE MORNING, BEFORE DRIER AIR
MOVES INTO THE AREA TODAY WITH SLIGHTLY COOLER TEMPERATURES AND
CONTINUED LOW HUMIDITIES. WINDS ALOFT WILL BE WEAKER TODAY AND
MONDAY. AS SUCH, GENERALLY LOWER AFTERNOON BREEZES WILL BE
EXPECTED TODAY THROUGH TUESDAY. GUSTY NORTHWEST VALLEY WINDS
FROM BAKER VALLEY OR TO THE LOWER TREASURE VALLEY AREAS OF THE
ID-OR BORDER WILL BE EXPECTED EACH EVENING FROM TONIGHT THROUGH
TUESDAY NIGHT. THESE HEIGHTENED NORTHWEST BREEZES WILL LIKELY
BRING DENSER SMOKE FROM WILDFIRES OVER EASTERN OR INTO MOST OF
THE TREASURE VALLEY, ESPECIALLY DURING THE OVERNIGHT AND MORNING
HOURS.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 331 AM MDT SUN JUL 26 2026
A STRONG HIGH PRESSURE SYSTEM SITTING OFF THE FOUR CORNERS
REGION, AND A TROUGH OVER BRITISH COLUMBIA, WILL KEEP OUR AREA
UNDER SOUTHWESTERLY FLOW ALOFT. MONSOONAL MOISTURE WILL REMAIN
SOUTH AND EAST OF OUR AREA IN THIS PATTERN, LEADING TO A HOT,
DRY, AND BREEZY LONG-TERM PERIOD. NEAR (LEANING ABOVE) NORMAL
TEMPERATURES WILL WARM TO AROUND 5 DEGREES ABOVE NORMAL COME
THURSDAY, AS THE AFOREMENTIONED HIGH PRESSURE SYSTEM SHIFTS WEST
OVER THE GREAT BASIN. SUNDAY MAY SEE A COOLDOWN TO NEAR-NORMAL
TEMPERATURES, DEPENDING ON HOW FAR DOWN TROUGHING FROM THE
NORTHWEST COAST REACHES INTO OUR AREA.
AVIATION /18Z SUNDAY THROUGH MONDAY/
ISSUED 1043 AM MDT SUN JUL 26 2026
WILDFIRE SMOKE RESULTING IN MVFR/IFR VISIBILITIES ACROSS THE
AREA. VISIBILITIES SHOULD INCREASE SLIGHTLY IN THE AFTERNOON,
BEFORE DEGRADING AGAIN OVERNIGHT AND EARLY MON/AM. HIGH DENSITY
ALTITUDE THIS AFTERNOON DUE TO HEAT. SURFACE WINDS: NW-SW 5-15
KT WITH AFTERNOON GUSTS TO 20-25 KT IN E-OREGON AND HIGHER
TERRAIN OF SW-IDAHO. WINDS ALOFT AT 10KFT MSL: SW 15-30 KT.
KBOI...VISIBILITY DEGRADED TO MVFR/IFR DUE TO WILDFIRE SMOKE.
SOME IMPROVEMENT THIS AFTERNOON, BEFORE SMOKE SETTLES IN AGAIN
OVER NIGHT AND EARLY MON/AM. HIGH DENSITY ALTITUDE THIS
AFTERNOON DUE TO HEAT. SURFACE WINDS: NW 8-12 KT THIS
AFTERNOON. THEN VARIABLE 2-7 KT OVERNIGHT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR QUALITY ALERT UNTIL 2 PM MDT TUESDAY FOR IDZ011>015-028-
029-033.
OR...AIR QUALITY ALERT UNTIL 11 AM PDT MONDAY FOR ORZ062.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....NF
SHORT TERM...JY
LONG TERM....JY
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