808
FXUS65 KBOI 241645
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
943 AM MST TUE FEB 24 2026
DISCUSSION
MODERATE TO LOCALLY HEAVY RAIN AND MOUNTAIN SNOW
ALL DAY TODAY, THEN DECREASING TONIGHT. PCPN WILL BE HEAVIEST
IN THE BOISE MOUNTAINS AND WEST CENTRAL IDAHO MOUNTAINS.
ACCUMULATING SNOW WAS REPORTED AS LOW AS 4500-5000 FEET MSL
EARLY THIS MORNING, LOWER THAN EXPECTED. MCCALL (ELEV 5050)
HAD AN INCH AT 7 AM MST. SNOW LEVELS SHOULD STILL GRADUALLY RISE
UNTIL THIS EVENING WHEN A COLD FRONT ARRIVES FROM THE WNW.
THEREFORE, MOST OF THE SNOW BELOW 6000 FEET HAS ALREADY OCCURRED.
WE ARE ALSO TRACKING FORECAST WIND GUSTS IN SOUTH- CENTRAL IDAHO
WEDNESDAY AFTERNOON. THE TREND IS SLIGHTLY LOWER SPEEDS SO A WIND
ADVISORY FOR WEDNESDAY IS NOT PLANNED AT THIS TIME.
AVIATION
WIDESPREAD PRECIPITATION AND MOUNTAIN OBSCURATION.
SNOW LEVELS GENERALLY 5-7KFT RISING TO 7-8KFT MSL THIS AFTERNOON,
EXCEPT STEADY AROUND 8KFT MSL NEAR THE NV BORDER. SURFACE
WINDS: SW- SE 5-15KT EXCEPT SW 20-30KT WITH GUSTS TO 40KT NEAR
THE OR/NV BORDER. AREAS OF LLWS THIS MORNING. WINDS ALOFT AT
10KFT MSL: W 35-50 KT.
KBOI...RAIN. LOW VFR WITH MVFR CEILINGS AT TIMES. 20% CHANCE
OF IFR CONDITIONS LATE AFTERNOON/EARLY EVENING. SE WINDS 10 KT.
PREV DISCUSSION
SHORT TERM...TODAY THROUGH THURSDAY NIGHT...WIDESPREAD RAIN
AND HIGH ELEVATION SNOW TODAY AS A PLUME OF SUBTROPICAL
MOISTURE MOVES OVERHEAD. PRECIPITABLE WATER VALUES WILL REACH
THE 99TH PERCENTILE, OR NEAR RECORD HIGHS FOR THIS TIME OF
YEAR, RESULTING IN MODERATE TO LOCALLY HEAVY PRECIPITATION.
STEADY RAIN AND SNOW WILL BECOME SHOWERY TONIGHT AND FOCUSED
IN THE MOUNTAINS AS THE MOISTURE PLUME SAGS SOUTH. STRONG
WESTERLY FLOW THROUGH THE EVENT WILL ENHANCE PRECIPITATION
TOTALS IN THE MOUNTAINS WITH 1-2" RAIN OR SNOW WATER EQUIVALENT.
MOST LOWER ELEVATIONS WILL SEE 0.25-0.75" RAIN, LOCALLY UP TO
1". THIS SYSTEM WILL BE MILD, WITH SNOW LEVELS RISING FROM
5-7KFT MSL THIS MORNING TO 6500-8500 FEET BY LATE AFTERNOON
(LOWEST ACROSS THE NORTH). LIGHT SNOW ACCUMULATIONS ARE EXPECTED
IN HIGHER MOUNTAIN COMMUNITIES, SUCH AS MCCALL, THIS MORNING
BEFORE TURNING TO RAIN THIS AFTERNOON. RAIN AND MELTING SNOW IN
THE MOUNTAINS BELOW THE SNOW LINE WILL INCREASE THE RISK FOR
ROCK AND MUD SLIDES BELOW STEEP SLOPES. ABOVE 6-7KFT, 8-16" SNOW
WILL BE COMMON, WITH TOTALS APPROACHING 2 FEET ON THE HIGHEST
PEAKS. HIGH TEMPERATURES TODAY WILL BE AROUND 5 DEGREES COOLER
THAN MONDAY DUE TO WIDESPREAD PRECIPITATION. WINDS IN THE HIGHER
TERRAIN WILL BE GUSTY, ESPECIALLY NEAR THE NEVADA BORDER WITH
GUSTS 30-45 MPH.
SHOWERS WILL GRADUALLY TAPER OFF WEDNESDAY AS A COLD FRONT
MOVES SOUTH. SNOW LEVELS WILL LOWER TO 4-5KFT BEHIND THE FRONT
WITH A DUSTING OF SNOW POSSIBLE IN MOUNTAIN VALLEYS. DESPITE
COOLING ALOFT, LESS PRECIPITATION WILL MEAN HIGH TEMPERATURES
WEDNESDAY WILL BE SIMILAR OR A COUPLE DEGREES WARMER THAN
TODAY, OR SLIGHTLY ABOVE NORMAL. WINDS WEDNESDAY WILL BE GUSTY
ACROSS THE AREA, STRONGEST ACROSS SOUTH-CENTRAL ID AND THE
HIGHER TERRAIN WHERE GUSTS WILL REACH 35-45 MPH. DRY CONDITIONS
WILL RETURN WEDNESDAY NIGHT INTO THURSDAY UNDER NORTHWEST FLOW
ALOFT. TEMPERATURES WILL BE SIMILAR WITH LOCALLY BREEZY WINDS.
LONG TERM...FRIDAY THROUGH TUESDAY...A STATIONARY FRONT WILL
REMAIN ALONG THE CANADIAN BORDER ON FRIDAY, WITH DRY AND MILD
WEST- NORTHWEST FLOW AND PRECIPITATION REMAINING NORTH. A WEAK
SYSTEM OFF THE WEST COAST WILL MOVE INLAND ON SUNDAY WITH A
30-50 PERCENT CHANCE OF PRECIPITATION. SNOW LEVELS WILL RANGE
FROM 5000-7000 FT MSL, BUT PRECIPITATION AMOUNTS WILL BE LIGHT.
THIS SYSTEM WILL MOVE SOUTH INTO THE FOUR CORNERS REGION BY
TUESDAY, WITH AN UPPER LEVEL RIDGE BUILDING OVER THE AREA. THIS
WILL BRING SPRING-LIKE TEMPERATURES WITH VALLEYS REACHING THE
LOW TO MID 60S ON TUESDAY AND WEDNESDAY, OR AROUND 10-15 DEGREES
ABOVE NORMAL.
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...LC
AVIATION.....CH
SHORT TERM...ST
LONG TERM....KA
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