528
FXUS65 KBOI 280332
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
832 PM MST TUE JAN 27 2026
DISCUSSION
NO UPDATE TO THE FORECAST THIS EVENING. CLOUDS ARE
INCREASING AND LOWERING AHEAD OF A COLD FRONT EXPECTED TO PASS
THROUGH TOMORROW MORNING. WITH SNOW LEVELS NEAR TO JUST ABOVE
VALLEY FLOORS, MOST OF THE AREA WILL SEE BRIEF WINTRY
PRECIPITATION, SNOW OR MIXED. SNOW ACCUMULATIONS IN LOWER
ELEVATIONS WILL BE LIMITED, WITH 0.5-2 INCHES EXPECTED IN HIGHER
TERRAIN. A BRIEF WARM NOSE BEFORE TEMPERATURES ALOFT COOL TO
WETBULBS MAY ALLOW PRECIPITATION TO MELT BEFORE REACHING THE
GROUND IN THE TREASURE VALLEY. WITH SUB-FREEZING TEMPS ON THE
GROUND, THIS MEANS A BRIEF SHOT AT FREEZING RAIN IS POSSIBLE.
HOWEVER, IT SEEMS UNLIKELY AS TEMPS ALOFT SHOULD COOL TO WET
BULB VERY QUICKLY ONCE PRECIPITATION BEGINS. WINTRY
PRECIPITATION MOVES EASTWARD AROUND NOON TOMORROW, BEFORE
CONDITIONS BEGIN TO IMPROVE. ANOTHER SHOT AT SOME LIGHT WINTRY
SHOWERS IS POSSIBLE THURSDAY AFTERNOON AS A RIDGE BEGINS TO
BUILD BACK INTO THE AREA FOR THE LONG TERM.
AVIATION
VFR THROUGH THIS EVENING. CONDITIONS DEGRADING TONIGHT
AS WINTER PRECIP MOVES W TO E THROUGH THE AREA BETWEEN WED/06Z-18Z.
IFR-LIFR AND MTN OBSCURATION IN SNOW. A 30% CHANCE OF FREEZING
RAIN/WINTRY MIX IN LOWER TREASURE VALLEY WED/09Z-12Z. CONDITIONS
IMPROVE LATER IN THE DAY TOMORROW. SURFACE WINDS: VARIABLE UP
TO 12 KT. WINDS ALOFT AT 10KFT MSL: SW 15-30 KT.
KBOI...LOWERING CLOUDS WITH A 30% CHANCE OF IFR/LIFR WED
MORNING. SNOW/WINTRY MIX IS POSSIBLE WED MORNING WITH A 10%
CHANCE OF FREEZING PRECIP. LINGERING LOW CEILINGS AFTER PRECIP
BEFORE IMPROVING TO VFR. SURFACE WINDS: LIGHT AND VARIABLE.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...AREAS OF MIST AND
SLIGHTLY REDUCED VISIBILITY ARE OCCURRING IN THE TREASURE
VALLEY THIS AFTERNOON THANKS TO LIMITED MIXING AND LIGHT WINDS.
HOWEVER, THIS QUIET PATTERN WILL GET A LITTLE JOLT OF
EXCITEMENT TOMORROW THANKS TO AN UPPER LEVEL TROUGH MOVING INTO
THE PACNW, BRINGING A QUICK HITTING COLD FRONT TO THE REGION.
THIS WILL BRING BREEZY WESTERLY WINDS, ESPECIALLY IN THE LOWER
SNAKE PLAIN TO THE MAGIC VALLEY AND ON RIDGETOPS. SNOW WILL BE
THE DOMINANT PRECIPITATION TYPE IN THE REGION WITH SOME LIGHT SHOWERS,
WITH SNOW LEVELS GRADUALLY INCREASING AS THE DAY PROGRESSES
FROM VALLEY FLOORS TO 3500-4500 FEET. POCKETS OF FREEZING RAIN
WILL OCCUR IN THE LOWER TREASURE VALLEY, GENERALLY SOUTH OF
ONTARIO- CALDWELL. SNOW AMOUNTS ACROSS THE REGION WILL GENERALLY
BE A DUSTING TO 1 INCH, WITH UP TO 2 INCHES IN HIGHER
ELEVATIONS AND ON MOUNTAIN TOPS. PRECIPITATION WILL END BY THE
MID AFTERNOON, WITH WINDS STAYING ELEVATED IN SOUTHERN PORTIONS
OF OUR CWA THROUGH THE DAY. ANOTHER SYSTEM WILL MOVE IN OVER TOP
OF THE REBUILDING RIDGE ON THURSDAY, WITH LIGHT SNOW SHOWERS
OVER BAKER COUNTY AND THE WEST CENTRAL/BOISE MOUNTAINS. OTHER
THAN THE FAR NORTHERN REGIONS, THURSDAY WILL GENERALLY BE DRY
WITH COLD TEMPERATURES LINGERING IN AREA VALLEYS.
LONG TERM...FRIDAY THROUGH TUESDAY...A WEAK SHORTWAVE TROUGH
MOVING WESTWARD OVER THE TOP OF THE PERSISTENT UPPER LEVEL RIDGE WILL
BRING A 20 TO 30 PERCENT CHANCE OF PRECIPITATION TO THE AREA ON
FRIDAY BEFORE THE RIDGE RESTRENGTHENS ON SATURDAY AND SUNDAY. ANOTHER
SHORTWAVE WILL DENT THE RIDGE AGAIN ON MONDAY AND TUESDAY BRINGING
ANOTHER CHANCE OF LIGHT PRECIPITATION FORECAST AREA. TEMPERATURES
WILL BE NEAR TO SLIGHTLY ABOVE SEASONAL NORMALS FOR THIS TIME OF
YEAR WITH A SLOW WARMING TEND. SNOW LEVELS RANGE BETWEEN 4500 AND
5500 FEET, SO THE PRECIPITATION TYPE WILL LIKELY BE SNOW IN THE
MOUNTAINS AND RAIN IN THE VALLEYS. FOR NOW, THERE APPEARS TO BE
ENOUGH FLOW TO KEEP THE ATMOSPHERE FROM GETTING TOO STAGNANT OR
FOGGY. HOWEVER, THE ADDITION OF SOME MOISTURE FROM THE WEAK SYSTEMS
MENTIONED EARLIER IN THE DISCUSSION WILL INCREASE THE CHANCE FOR
VALLEY FOG LATER IN THE EXTENDED FORECAST PERIOD.
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
DISCUSSION...JM
AVIATION.....JM
SHORT TERM...SA
LONG TERM....JB
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