669
FXUS65 KBOI 041712
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1012 AM MST WED FEB 4 2026
DISCUSSION
AREAS OF FOG THIS MORNING, MOSTLY IN THE MTN
VALLEYS, IS STARTING TO DISSIPATE. MOISTURE MOVING THROUGH THE
UPPER RIDGE WILL KEEP HIGH CLOUDS OVER THE AREA TODAY, BUT
GENERALLY MOSTLY CLEAR SKIES AND MILD TEMPERATURES WILL
CONTINUE. THE STAGNANT AIR MASS WILL CONTINUE TO TRAP POLLUTANTS
AND MOISTURE NEAR THE SURFACE LEADING TO INCREASED HAZE AND FOG
OVER THE NEXT SEVERAL DAYS. NO UPDATE TO THE FORECAST THIS
MORNING.
AVIATION
GENERALLY VFR. LINGERING LOCALIZED MVFR/IFR
CONDITIONS FROM HAZE IN LOWER BASINS AND SHELTERED VALLEYS.
IMPROVING TO VFR AREA WIDE BY LATE-MORNING. SURFACE WINDS:
VARIABLE UP TO 10 KT, EXCEPT E 10-15 KT IN THE WESTERN MAGIC
VALLEY AFTER THU/05Z. WINDS ALOFT AT 10KFT MSL: VARIABLE 5-15
KT.
KBOI...VFR UNDER HIGH CLOUDS. SURFACE WINDS: VARIABLE OR SE 3-7
KT.
PREV DISCUSSION
SHORT TERM...TODAY THROUGH FRIDAY NIGHT...THE UPPER RIDGE (AND
THE INVERSION BELOW) WILL BE AT MAXIMUM STRENGTH TODAY AND
THURSDAY, FOLLOWED BY GRADUAL WEAKENING. THIS MEANS CONTINUED
DRY, MILD WEATHER ALOFT (ABOVE 5500 FEET MSL) AND COOLER,
STAGNANT AIR BELOW WITH PATCHY FOG AND LOW CLOUDS IN THE LOWER
VALLEYS. LITTLE DAY-TO-DAY TEMPERATURE CHANGE THROUGH FRIDAY.
LONG TERM...SATURDAY THROUGH WEDNESDAY...THE UPPER RIDGE WILL
CONTINUE TO WEAKEN SATURDAY AND SUNDAY WHILE ALSO SHIFTING EAST.
LATEST MODELS CONTINUE TO BRING A NORTH PACIFIC COLD FRONT AND
SUPPORTING UPPER TROUGH INLAND AND THROUGH OUR AREA LATE SUNDAY
NIGHT/MONDAY MORNING. THE FRONT LOOKS STRONG ENOUGH TO SCOUR THE
INVERSION, AND COOLING ALOFT SHOULD GREATLY IMPROVE MIXING TO
END THE AIR STAGNATION. WE HAVE A 50 TO 80 PERCENT CHANCE OF
RAIN AND SNOW WITH THE FRONTAL PASSAGE, WITH SNOW LEVEL LOWERING
TO VALLEY FLOORS BY TUESDAY NIGHT AFTER PCPN HAS ENDED. SOME
MODELS INCREASE MOISTURE AGAIN FOR SNOW, OR MIXED RAIN AND SNOW,
IN SOUTHERN AREAS WEDNESDAY.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR STAGNATION ADVISORY UNTIL 5 AM MST MONDAY
IDZ012-014-016-033.
OR...AIR STAGNATION ADVISORY UNTIL 5 AM MST /4 AM PST/ MONDAY
ORZ062>064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
DISCUSSION...DG
AVIATION.....NF
SHORT TERM...LC
LONG TERM....LC
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