638
FXUS65 KBOI 231102
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
402 AM MST FRI JAN 23 2026
SHORT TERM...TODAY THROUGH SUNDAY NIGHT
LOW CLOUDS AND
PATCHY FOG PERSIST IN THE VALLEYS BELOW 5000 FEET MSL TODAY.
COOLER AIR ALOFT WILL BEGIN TO MOVE INTO THE AREA TODAY,
HELPING TO MIX OUT THE LOW CLOUDS TRAPPED IN THE VALLEYS FROM
NORTH TO SOUTH. THE FORECAST MODELS SEEM TO BE TOO AGGRESSIVE
IN MIXING OUT THE STRATUS, AND COULD LINGER LONGER THAN
FORECAST. LOW CLOUDS AND FOG REMAIN IN THE COLUMBIA BASIN AND IN
THE VALLEYS OF BRITISH COLUMIA, AND ARE PERSISTING LONGER THAN
GUIDANCE HAS FORECAST. OF COURSE IF THE STRATUS HOLDS ON IN THE
VALLEYS, WE MAY NOT SEE MUCH WIND OR MIXING TODAY. FORECAST
CONFIDENCE IS LOW ON THE EVOLUTION OF THE LOW CLOUDS AND DRY AIR
WILL CONTINUE MOVE INTO THE AREA FROM THE NORTH. IT REMAINS TO
BE SEEN IF THE COOLER DRY AIR CAN ERODE THE STRATUS DECK BY LATE
SATURDAY NIGHT WITH MOSTLY CLEAR SKIES. TEMPERATURES WILL BE
AROUND 5-10 DEGREES BELOW NORMAL IN THE SHORT TERM.
LONG TERM...MONDAY THROUGH FRIDAY
A SLIGHT WARMING TREND
ENSUES AS WARMER AIR ALOFT MOVES INTO THE AREA ON SUNDAY AND
MONDAY. A RIDGE WILL STRENGTHEN OVER THE AREA ON TUESDAY AND
WEDNESDAY WITH A TEMPERATURE INVERSION REDEVELOPING. BY THURSDAY
THE RIDGE WEAKENS ALLOWING FOR A 10 PERCENT CHANCE OF SHOWERS
OVER THE MOUNTAINS, BUT THIS IS TRENDING LOWER. TEMPERATURES
WILL REMAIN AT OR BELOW NORMAL IN THE VALLEYS WITH ABOVE NORMAL
TEMPERATURES IN THE MOUNTAINS.
AVIATION
MVFR-IFR STRATUS IN THE VALLEYS GENERALLY BELOW
5000 FEET MSL. LOCAL LIFR NEAR KTWF KJER KBNO. SURFACE WINDS
VRB 10KT OR LESS.
KBOI...MVFR CEILINGS CONTINUING, BRIEF IMPROVEMENT TO VFR LATE
AFTERNOON, BUT MVFR TO IFR RETURNING AFTER SUNSET. SURFACE
WINDS VRB 10KT OR LESS.
WEEKEND OUTLOOK...AREAS OF MVFR-LIFR LOW CLOUDS AND FOG
SATURDAY CLEARING TO VFR IN THE AFTERNOON, EXCEPT NEAR KTWF
KJER. SURFACE WINDS NW 5-15KT SAT AFTERNOON. SUNDAY VFR WITH
LIGHT WINDS. LOW CLOUDS AND FOG LINGERING NEAR KJER KTWF.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR STAGNATION ADVISORY UNTIL 5 AM MST EARLY THIS MORNING
IDZ011>014-016-028-033.
OR...AIR STAGNATION ADVISORY UNTIL 5 AM MST /4 AM PST/ EARLY THIS
MORNING ORZ061>064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...KA
LONG TERM....KA
AVIATION.....KA
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