612
FXUS65 KBOI 260511
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1111 PM MDT SUN OCT 25 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- MILDER TONIGHT UNDER INCREASING CLOUDS.
- LIGHT RAIN AND MOUNTAIN SNOW MONDAY AFTERNOON THROUGH TUESDAY
MORNING, MAINLY IN NORTHERN AREAS.
- WINDY MONDAY AFTERNOON IN OPEN SOUTHERN AREAS.
- CONTINUING CHANCE OF LIGHT RAIN AND SNOW SHOWERS IN NORTHERN
AREAS TUESDAY.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 209 PM MDT SUN OCT 25 2026
UPPER LOW FROM THE GULF OF ALASKA WAS NEAR THE WA COAST EARLY
THIS AFTERNOON, WITH SURFACE COLD FRONT ALREADY INLAND, AND
HIGH CLOUDS OVER ALL OF WA AND OR. THE UPPER LOW CENTER IS
FORECAST INLAND ALONG 45N TONIGHT AND MONDAY, A LITTLE NORTH
OF YESTERDAY'S PREDICTED TRACK. THIS CHANGE MEANS LESS PCPN FOR
OUR CWA MONDAY AND MONDAY NIGHT, WITH NEW ESTIMATES .20 TO .40
INCH IN NORTHERN MOUNTAINS, .10 TO .20 INCH IN NORTHERN VALLEYS
AND SOUTHERN MOUNTAINS, AND LESS THAN .10 INCH IN SOUTHERN
VALLEYS. SOUTH OF THE SNAKE BASIN WILL PROBABLY STAY DRY. THE
SYSTEM WILL BE COLD ENOUGH, THOUGH, FOR A DUSTING TO 2 INCHES
OF SNOW IN NORTHERN AREAS ABOVE 5000 FEET. MARGINAL INSTABILITY
WILL ALSO SUPPORT A SLIGHT (10-15%) CHANCE OF WEAK
THUNDERSTORMS IN HARNEY COUNTY AND THE CENTRAL IDAHO MOUNTAINS
MONDAY. MONDAY AFTERNOON ALSO LOOKS WINDY IN OPEN AREAS OF
SOUTHEAST OR AND SOUTHERN ID, WITH WEST/SOUTHWEST GUSTS 25 TO
30 MPH. LOW TEMPS TONIGHT WILL BE MILDER THAN THE PREVIOUS TWO
NIGHTS UNDER INCREASING CLOUDS. HIGH TEMPS MONDAY WILL GET INTO
THE MID 60S IN SOUTHERN ID BEFORE THE COLD FRONT ARRIVES.
NORTHERN AND WESTERN AREAS WILL BE 4 TO 8 DEGREES COOLER THAN
TODAY WITH THE FRONT ALREADY PAST. PARTIAL CLEARING MONDAY NIGHT
WILL ALLOW LOWS TUESDAY MORNING 5 TO 10 DEGREES COLDER THAN
TONIGHT, WITH PATCHY FOG TOWARD MORNING. ANOTHER WEAK UPPER LOW
WILL APPROACH FROM WESTERN WA TUESDAY AND MAINTAIN CLOUDS AND
CHANCE OF RAIN AND SNOW SHOWERS IN NORTHERN AREAS THROUGH THE
DAY, THEN CLEARING TUESDAY NIGHT EXCEPT IN THE FAR NORTH WHERE
A CHANCE OF RAIN AND SNOW SHOWERS WILL CONTINUE INTO WEDNESDAY.
THE CLEARING SKIES ELSEWHERE WILL ALLOW COLDER LOW TEMPS
WEDNESDAY MORNING AND SLIGHTLY WARMER HIGH TEMPS WEDNESDAY
AFTERNOON.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 209 PM MDT SUN OCT 25 2026
CONTINUED GOOD AGREEMENT AMONGST FORECAST GUIDANCE THAT AN
ACTIVE WEATHER PATTERN WILL BE IN PLACE THROUGHOUT THE WEEK
AND INTO NEXT WEEKEND. GUIDANCE IS NARROWING FOCUS ON A MORE
IMPACTFUL LOW PRESSURE SYSTEM FOR THE WEEKEND, WITH THE BEST
CHANCES FOR PRECIPITATION ON SATURDAY NIGHT AND SUNDAY.
TEMPERATURES ARE EXPECTED TO REMAIN AT OR NEAR NORMAL FOR
THE PERIOD.
AVIATION /06Z MONDAY THROUGH TUESDAY/
ISSUED 1111 PM MDT SUN OCT 25 2026
VFR TONIGHT WITH HIGH/MID CLOUDS. A 10% CHANCE OF FOG/LOW STRATUS IN
SHELTERED MTN VALLEYS, LIMITED BY HIGH CLOUDS. SHOWERS ARRIVING FROM
W TO E WITH COLD FRONT AFTER MON/14Z IN E OREGON, AFTER MON/17Z IN
SW IDAHO. LOW VFR TO MVFR IN RAIN, IFR IN MOUNTAIN SNOW. SNOW
LEVELS: 5.5-6.5KFT MSL. MTNS BECOMING OBSCURED. SURFACE WINDS: E-S 5-
15 KT, SHIFTING TO SW-NW 10-20 KT WITH 20-30 KT GUSTS MON/PM. LLWS
OVERNIGHT NEAR KONO/KBNO. WINDS ALOFT AT 10KFT MSL: SW-W 15-30 KT.
KBOI...VFR WITH HIGH/MID CLOUDS. SHOWERS ARRIVING AFTER MON/19Z
THROUGH TUE/00Z WITH COLD FRONT, WITH BRIEF MVFR POSSIBLE. A 10%
CHANCE OF LIGHTNING DURING SHOWER ONSET. SURFACE WINDS: SE 5-12 KT,
GUSTS 15-20 KT LATE MON AM. SHIFTING TO W-NW 8-15 KT AROUND MON/19Z
WITH COLD FRONT. PERIOD OF GUSTS TO 20-30 KT WITH ARRIVAL OF
SHOWERS/COLD FRONT MONDAY AFTERNOON.
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
AVIATION.....SH
SHORT TERM...LC
LONG TERM....MC
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