103
FXUS65 KBOI 201056
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
356 AM MST TUE JAN 20 2026
SHORT TERM...TODAY THROUGH THURSDAY NIGHT
LOW CLOUDS AND FOG
REMAIN IN THE VALLEYS GENERALLY BELOW 5000 FEET THIS MORNING AND
WILL CONTINUE OVER THE NEXT SEVERAL DAYS. THE CLOUDS MAY
PRODUCE FLURRIES AT TIMES. TEMPERATURES WILL REMAIN WELL BELOW
GUIDANCE AND HAVE USED PERSISTENCE IN THE FORECAST AS THE NBM
AND REST OF THE HIGH RESOLUTION GUIDANCE CANNOT RESOLVE THE
VALLEY COLD POOLS.
LONG TERM...FRIDAY THROUGH TUESDAY
DRY CONDITIONS CONTINUE
AND PERSISTENCE WAS USED AS THE ENSEMBLE AND NBM GUIDANCE WAS
USELESS. COOLER AIR ALOFT WILL BEGIN TO MOVE INTO THE AREA ON
FRIDAY WHICH MAY HELP TO MIX OUT THE LOW CLOUDS AND FOG, AND
ACTUALLY WARM UP TEMPERATURES IN THE VALLEYS, ALTHOUGH FORECAST
CONFIDENCE IS LOW. A RIDGE BUILDS INTO THE AREA AGAIN BY
TUESDAY, WITH WARMER AIR ALOFT AND A TEMPERATURE INVERSION
STRENGTHENING AGAIN. WITH PERSISTENCE USED, TEMPERATURES IN THE
VALLEYS REMAIN BELOW NORMAL WITH ABOVE NORMAL TEMPERATURES OVER
THE MOUNTAINS.
AVIATION
MVFR-LIFR BELOW 5K-6K FEET MSL IN THE SNAKE PLAIN
AND SURROUNDING BASINS DUE TO PERSISTENT LOW STRATUS AND FOG.
SURFACE WINDS: VARIABLE LESS THAN 8 KT. WINDS ALOFT AT 10KFT
MSL: NW 10-20 KT, INCREASING TO NW-N 15-30 KT AROUND TUE/15Z.
KBOI...IFR-LIFR CEILINGS EXPECTED OVERNIGHT, RISING TO MVFR-IFR
BY LATE TUE MORNING. EXPECT OCCASIONAL SNOW GRAINS OUT OF THE
STRATUS. SURFACE WINDS: LIGHT AND VARIABLE OVERNIGHT, THEN NW
AROUND 5 KT TUE AFTERNOON.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR STAGNATION ADVISORY UNTIL 11 AM MST THURSDAY
IDZ011>014-016-028-033.
OR...AIR STAGNATION ADVISORY UNTIL 11 AM MST /10 AM PST/ THURSDAY
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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