229
FXUS65 KBOI 152200
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
300 PM MST THU JAN 15 2026
SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT
UPPER LEVEL RIDGE
CONTINUES TO IMPACT THE AREA WITH FOG AND STRATUS ACROSS THE
SNAKE BASIN, AND MILD TEMPERATURES ABOVE THE FOG. MOSTLY SUNNY
SKIES OUTSIDE OF THE SNAKE BASIN. THIS FOG/STRATUS IS LIKELY TO
CONTINUE TONIGHT WITH LITTLE IMPROVEMENT OVER THE NEXT SEVERAL
DAYS. WE LOWERED THE TEMPERATURES IN THE SNAKE BASIN FOR THE FOG
AND STRATUS OVER THE NEXT SEVERAL DAYS. ABOVE THE INVERSION,
TEMPERATURES REMAIN AROUND 10 DEGREES ABOVE NORMAL. AREAS OF FOG
DEVELOP IN THE MOUNTAIN VALLEYS, INCLUDING THE LONG VALLEY AND
BAKER VALLEY OVERNIGHT EVERY NIGHT OVER THE NEXT FEW DAYS.
LONG TERM...SUNDAY THROUGH THURSDAY
UPPER-LEVEL RIDGING
CONTINUES INTO EARLY NEXT WEEK, WITH THE RIDGE AXIS SHIFTING
WEST ENOUGH TO CAUSE MORE NORTHERLY FLOW ALOFT. CLUSTERS AND
ENSEMBLES KEEP RIDGING IN PLACE AT LEAST THROUGH TUESDAY
AFTERNOON, AFTER WHICH THE RIDGE WILL WEAKEN BUT STILL PERSIST.
THE PATTERN CHANGE COMES IN WEDNESDAY INTO THURSDAY, WHEN AN
UPPER-LEVEL SHORTWAVE TROUGH MOVES OVER THE REGION.
PRECIPITATION AMOUNTS AND TROUGH INTENSITY VARY SUBSTANTIALLY
ACROSS MODELS, HOWEVER, THE SOLUTIONS AGREE ON PROVIDING *SOME*
RELIEF AGAINST THIS INVERSION. SNOW CHANCES ALSO RETURN TO THE
HIGHER ELEVATIONS WITH THIS SYSTEM AROUND 30% ON THURSDAY.
AVIATION
WIDESPREAD IFR-LIFR IN THE SNAKE PLAIN, WITH FOG
CHANCES EXISTING FOR ALL SITES. LOCALIZED IMPROVEMENT OF
CONDITIONS POSSIBLE BEFORE SUNSET, WITH RAPIDLY WORSENING OF
CONDITIONS BACK TO LIFR AROUND SUNSET. CONFIDENCE IN TIMING OF
CLEARING AND COVERAGE WILL REMAIN LOW. OTHERWISE VFR CONDITIONS
UNDER CLEAR SKIES. SURFACE WINDS: VARIABLE UP TO 10 KT. WINDS
ALOFT AT 10KFT MSL: N 15-30 KT.
KBOI...IFR-VLIFR CONDITIONS TO PERSIST. MINOR IMPROVEMENT TO IFR
CONDITIONS BEFORE SUNSET, WITH LIFR CONDITIONS RETURNING
OVERNIGHT. EARLIEST IMPROVEMENT TO MVFR-VFR CONDITIONS LOOKS TO
BE FRIDAY AFTERNOON, HOWEVER CHANCES ARE STILL 30% FOR IFR
CONDITIONS DURING THAT PERIOD. SURFACE WINDS: LIGHT AND
VARIABLE.
WEEKEND OUTLOOK...VALLEY FOG AND STRATUS CONTINUES OVER THE
WEEKEND WITH VFR ABOVE THE INVERSION. LIGHT SURFACE WINDS.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR STAGNATION ADVISORY UNTIL 5 AM MST MONDAY
IDZ011>014-016-028-033.
DENSE FOG ADVISORY UNTIL 1 PM MST FRIDAY IDZ012-014-016-033.
OR...AIR STAGNATION ADVISORY UNTIL 5 AM MST /4 AM PST/ MONDAY
ORZ061>064.
DENSE FOG ADVISORY UNTIL 1 PM MST /NOON PST/ FRIDAY ORZ064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...KA
LONG TERM....CH
AVIATION.....CH
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page