146
FXUS65 KBOI 102040
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
240 PM MDT SAT OCT 10 2026
KEY MESSAGES
- COOLER THAN NORMAL TEMPERATURES, 10 TO 15 DEGREES BELOW NORMAL
THROUGH MONDAY.
- UNSETTLED CONDITIONS THROUGH TUESDAY, MAINLY ON THE IDAHO
SIDE.
- SNOW LEVELS NEAR 6000-7000 FEET IN THE WEST CENTRAL ID
MOUNTAINS THROUGH MONDAY WITH LIGHT ACCUMULATIONS, HIGHER
LEVELS TO THE SOUTH AND EAST.
- WARM AND DRY CONDITIONS WEDNESDAY THROUGH NEXT WEEKEND.
SHORT TERM /THROUGH MONDAY NIGHT/
A TROUGH OVER WA WILL
SLOWLY MOVE SOUTH INTO NORTHERN CA BY SUNDAY WITH A LONG STREAM
OF MOISTURE CONNECTED TO THE REMNANTS OF WHAT WAS RACHEL. MOST
OF THE MOISTURE WILL STAY EAST OF OUR AREA THOUGH, WITH COOLER
TEMPERATURES AND BREEZY CONDITIONS AS THE MAIN IMPACT.
PRECIPITATION OVER EASTERN OR WILL GENERALLY BE LIMITED WITH
THIS SYSTEM, WITH THE BEST CHANCE AND HEAVIEST PRECIPITATION
COMING OVER THE BOISE MOUNTAINS, AND EASTERN MAGIC VALLEY
THROUGH SUNDAY. PRECIPITATION AMOUNTS OF 0.5 TO 1.0 POSSIBLE
GENERALLY FROM TWIN FALLS AND AREAS EAST, WITH UP TO 0.25
POSSIBLE OVER THE REST OF SW IDAHO. SNOW LEVELS FALL TO 5000 TO
6000 FEET IN EASTERN OR, AND NORTH OF MCCALL ID, BUT
PRECIPITATION WILL BE LIMITED. SNOW LEVELS IN ID WILL BE MUCH
HIGHER IN THE WARM SECTOR OF THE SYSTEM, WITH 7000 TO 8000 FEET
OVER THE CENTRAL ID MOUNTAINS. THE TROUGH WILL REMAIN NEARLY
STATIONARY THROUGH MONDAY KEEPING A THREAT OF SHOWERS MAINLY
OVER THE IDAHO SIDE.
LONG TERM /TUESDAY THROUGH SATURDAY/
A WARMING TREND AND
DRYING TREND WILL SET IN COME TUESDAY AS THE LOW EXITS TO THE
EAST. OUR FAR EASTERN ZONES MAY END UP ON THE PERIPHERY OF THE
WRAP AROUND PRECIPITATION ASSOCIATED WITH THE LOW, LEADING TO A
20-40% CHANCE OF PRECIPITATION TUESDAY MORNING; GENERALLY SOUTH
AND EAST OF MOUNTAIN HOME. TUESDAY AND WEDNESDAY AFTERNOONS WILL
REMAIN BREEZY AS THE LOW EXITS. BEYOND TUESDAY, A WARMING TREND
WILL SET IN THROUGH THE START OF THE WEEKEND WITH DRY
CONDITIONS. THIS IS THANKS TO A RIDGE THAT WILL BUILD IN OVER
THE WEST COAST BEFORE EVENTUALLY SHIFTING TO BE OVER THE GREAT
BASIN. TEMPERATURES WILL START OUT RIGHT AROUND NORMAL TUESDAY
BEFORE INCREASING TO AROUND 5-10 DEGREES ABOVE NORMAL BY FRIDAY.
AVIATION /18Z SATURDAY THROUGH SUNDAY/
ISSUED 1130 AM MDT SAT OCT 10 2026
GENERALLY VFR. ISOLATED SHOWERS THIS AFTERNOON IN SW-IDAHO, WITH
ISOLATED THUNDER MAINLY S-E OF KTWF. PRECIPITATION INCREASING
FROM SE TO NW SUN/AM INTO SUN/PM, MAINLY EAST AND SOUTH OF A
KMYL/KONO/KBNO LINE. MVFR AND MTN OBSCURATION POSSIBLE IN
PRECIP. SURFACE WINDS: W-NW 5-15 KT WITH GUSTS TO 20-25 KT.
WINDS ALOFT AT 10 KFT MSL: SW 20-30 KT.
KBOI...VFR UNDER FEW TO SCT CLOUDS THIS AFTERNOON, CLOUDS
INCREASING THIS EVENING. A 30% CHANCE OF RAIN THIS EVENING.
SURFACE WINDS: NW 5-15 KT THROUGH THE PERIOD, WITH GUSTS TO
AROUND 22 KT THIS AFTERNOON.
SUNDAY OUTLOOK...PRECIPITATION EXPANDING FROM THE ID-NV BORDER
THROUGH S-CENTRAL AND CENTRAL IDAHO SUNDAY. PERIODS OF
SNOW/WINTRY MIX OVER HIGHER TERRAIN. MVFR/IFR CONDITIONS AND
MOUNTAIN OBSCURATION POSSIBLE IN PRECIP. SNOW LEVELS: 6-9 KFT
MSL IN SW IDAHO. SURFACE WINDS: SURFACE WINDS: W-N 5-15 KT WITH
GUSTS 20-30 KT.
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
SHORT TERM...KA
LONG TERM....NF
AVIATION.....NF
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