341
FXUS65 KBOI 270912
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
312 AM MDT MON JUL 27 2026
KEY MESSAGES
- WARM AND DRY CONDITIONS WILL PERSIST OVER THE NEXT SEVERAL
DAYS.
- SMOKY CONDITIONS WILL LIMIT HIGH TEMPERATURES BY A FEW DEGREES
AND CONTINUE DEGRADED AIR QUALITY.
- SLIGHTLY COOLER WITH NEAR-NORMAL TEMPERATURES THROUGH
MIDWEEK.
- RETURN OF WARMER THAN NORMAL TEMPERATURES LATE WEEK.
SHORT TERM /THROUGH WEDNESDAY NIGHT/
LIGHT TO MODERATE SOUTHWEST FLOW FROM THE LARGE HIGH PRESSURE
SYSTEM OVER THE FOUR CORNERS REGION WILL PERSIST OVER OUR AREA
THROUGH THE WEEK. TEMPERATURES WILL GENERALLY STAY NEAR SEASONAL
NORMALS. GENERALLY LIGHTER AFTERNOON WIND BREEZES WILL BE
EXPECTED OVER THE NEXT FEW DAYS, WITH THE EXCEPTION OF ELEVATED
DOWNVALLEY WINDS OVER THE BAKER VALLEY CORRIDOR EACH EVENING.
THE DENSE SMOKE OVER VALLEYS HAVE MODERATED PEAK TEMPERATURES,
SO SLIGHTLY COOLER THAN NORMAL TEMPERATURES REMAIN POSSIBLE
THROUGH MIDWEEK. LITTLE IMPROVEMENT EXPECTED TO WILDFIRE SMOKE
DUE TO LIGHTER WINDS ALOFT OVER THE NEXT SEVERAL DAYS. THE
AFOREMENTIONED DOWNVALLEY WINDS OVER BAKER VALLEY WILL CONTINUE
TO STEER DENSE SMOKE INTO THE TREASURE AND MAGIC VALLEYS,
ESPECIALLY DURING THE NIGHTTIME AND MORNING HOURS.
LONG TERM /THURSDAY THROUGH MONDAY/
SOUTHWEST FLOW ALOFT WILL CONTINUE TO BE THE NAME OF THE GAME
IN THE LONG-TERM PERIOD. WITH HIGH PRESSURE ALOFT OVER THE FOUR
CORNERS REGION, AND TROUGHING OVER BRITISH COLUMBIA, CONDITIONS
WILL REMAIN WARM, DRY, AND BREEZY. LATER IN THE WEEK, THE HIGH
PRESSURE ALOFT WILL SHIFT OVER THE GREAT BASIN, ALLOWING FOR
TEMPERATURES TO RISE TO AROUND 5 DEGREES ABOVE NORMAL THURSDAY
AND AFTER. AFTERNOON BREEZES WILL INCREASE COME SATURDAY AND
SUNDAY, AS A SHORTWAVE ASSOCIATED WITH THE AFOREMENTIONED TROUGH
MOVES INLAND AND TIGHTENS THE PRESSURE GRADIENT OVER OUR AREA.
A DRY COLD FRONT ASSOCIATED WITH THE SHORTWAVE WILL SAG SOUTH
COME THIS WEEKEND, ALLOWING FOR TEMPERATURES TO COOL TO NEAR, OR
EVEN SLIGHTLY BELOW, NORMAL SUNDAY AND MONDAY. OTHERWISE, THE
REGION IS EXPECTED TO REMAIN CONSIDERABLY DRIER THAN NORMAL
THROUGHOUT THE LONG-TERM PERIOD.
AVIATION /06Z MONDAY THROUGH TUESDAY/
ISSUED 1155 PM MDT SUN JUL 26 2026
WILDFIRE SMOKE RESULTING IN AREAS OF MVFR/IFR HORIZONTAL
VISIBILITY, AND SIGNIFICANTLY REDUCED SLANTWISE VISIBILITY.
MTNS OBSCURED IN SMOKE. SLIGHT IMPROVEMENT IN VISIBILITY DURING
LATE AFTERNOONS, BEFORE DEGRADING AGAIN OVERNIGHT/EARLY
MORNINGS. SURFACE WINDS: NW- SW 5-15 KT. GUSTS AROUND 25 KT IN
PORTIONS OF E OREGON. WINDS ALOFT AT 10KFT MSL:
SW 10-20 KT.
KBOI...VISIBILITY DEGRADED TO MVFR/IFR DUE TO WILDFIRE SMOKE. WORST
CONDITIONS EXPECTED IN THE MORNING AND NIGHTTIME HOURS. SURFACE
WINDS: VARIABLE 2-6 KT OVERNIGHT, TRANSITIONING NW 5-12 KT LATE
MORNING.
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 THIS MORNING FOR ORZ062.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...JY
LONG TERM....JY
AVIATION.....SH
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