332
FXUS65 KBOI 281001
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
401 AM MDT THU AUG 28 2025
SHORT TERM...TODAY THROUGH SATURDAY NIGHT
THE PLUME OF DEEP
MONSOON MOISTURE THAT'S BEEN IN PLACE OVER THE REGION FOR PAST
FEW DAYS IS BEING PINCHED OFF AND LIFTED NORTHWARD THIS MORNING.
WHILE WEAK UPPER RIDGING BRINGS DRIER AIR TO THE REGION TODAY
AND FRIDAY WE WON'T COMPLETELY GET RID OF THE SHOWER AND
THUNDERSTORM THREAT. AFTERNOON HEATING/INSTABILITY WILL SUPPORT
CUMULUS BUILDUPS AND A 20% CHANCE OF SHOWERS AND THUNDERSTORMS
ACROSS SE HIGHER AND HIGHER TERRAIN SOUTH OF THE SNAKE PLAIN IN
IDAHO THIS AFTERNOON. THE AREA EXPANDS TO COVER THE W-CENTRAL
IDAHO MTNS ON FRIDAY. THE DRIER AIR MASS AND A WEAK SHEAR
ENVIRONMENT WILL SHIFT THE MAIN STORM ATTRIBUTE TO GUSTY
OUTFLOW WINDS BOTH DAYS. THE UPPER RIDGE AMPLIFIES OVER THE
AREA ON SATURDAY, BRINGING FURTHER DRYING AND MORE STABLE
CONDITIONS ALOFT WHICH WILL CAP ANY THREAT FOR AFTERNOON
SHOWERS/STORMS. A MORE WESTERLY FLOW ALOFT THROUGH FRIDAY WILL
TRANSPORT ELEVATED SMOKE TO THE AREA FROM WILDFIRES IN W-CENTRAL
OREGON, MAKING FOR HAZY SKIES. TEMPERATURES RETURN TO NORMAL BY
FRIDAY, PLACING HIGH TEMPERATURES AROUND 90 DEGREES AT LOWER
ELEVATIONS.
LONG TERM...SUNDAY THROUGH THURSDAY
A BROAD UPPER RIDGE OFF
THE DESERT SOUTHWEST WILL CONTINUE BUILDING INTO OUR AREA
THROUGH SUNDAY. A SLIGHT WARMING TREND WILL CONTINUE SUNDAY
THROUGH THURSDAY, WITH VALLEY DAYTIME TEMPERATURES EXPECTED TO
LINGER IN THE LOWER 90S AND CENTRAL MOUNTAIN DAYTIME
TEMPERATURES IN THE UPPER 70S/LOWER 80S. MONDAY THROUGH THURSDAY
WILL SEE AN UPPER LOW STALLING AND WOBBLING OFF THE PACIFIC
NORTHWEST COAST AND SLOWLY SHIFT BACK OUT NORTHWEST. THIS ODD
TROUGHING PATTERN HAS THE POTENTIAL TO STEER WEAK UPPER MOISTURE
INTO THE AREA FROM THE COAST OF CALIFORNIA. FOR NOW, THE
HIGHEST CHANCES OF SHOWERS/THUNDERSTORMS REMAIN OVER THE HIGHER
ELEVATIONS ALONG THE EASTERNMOST SIDE OF THE FORECAST AREA AND
ALONG THE ID-NV BORDER. OTHERWISE, MOSTLY DRY AND WARM
CONDITIONS WILL PERSIST THROUGHOUT THE EXTENDED.
AVIATION
MOSTLY VFR. LOCALIZED MVFR/IFR IN LOW CLOUDS AND
PATCHY FOG OVERNIGHT AND THURSDAY MORNING, PRIMARILY IN
MOUNTAIN VALLEYS. MOUNTAINS OBSCURED IN LOW CLOUDS. SURFACE
WINDS: VARIABLE 5-10 KT WITH GUSTS TO 25 KT IN HIGHER
ELEVATIONS. WINDS ALOFT AT 10KFT MSL:
W-NW 15-25 KT.
KBOI...MAINLY VFR. PERIODS OF MVFR/IFR IN LOW CLOUDS AND PATCHY
FOG NEAR THE FOOTHILLS, ENDING BY LATE MORNING. SURFACE WINDS:
SE 5-8 KT BECOMING W-NW 10 KT OR LESS BY THURSDAY/18Z.
WEEKEND OUTLOOK...VFR CONDITIONS. WINDS E-SE 5-10 KT. MOSTLY
CLEAR SKIES WITH SOME HIGH CLOUDS APPROACHING E'RN OR SUNDAY
AFTERNOON/EVENING.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...DG
LONG TERM....JY
AVIATION.....JY
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page