229
FXUS65 KBOI 300004
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
604 PM MDT Thu Oct 29 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Continued dry with normal temperatures through Friday morning.

- Precipitation chances increasing across higher terrain on the
  Idaho side Friday, becoming widespread in in ID and OR Saturday
  afternoon through Sunday.

- Drying and warming Monday through Thursday, then turning
  cooler and wetter Thursday and beyond.

&&

.SHORT TERM /Through Saturday Night/...
Issued 204 PM MDT THU OCT 29 2026
Upper low center off the WA coast will hold stationary through
Saturday evening but the low will elongate southward down the
coast during that time. Subtropical Pacific moisture off Baja
California will enter the south end of the low beginning
Saturday and be drawn northward through the Great Basin along
and ahead of a developing eastward-moving surface cold front.
The front will become a focus for moderate to heavy pcpn as it
moves across our CWA Saturday night through Sunday. Eastern OR
will become wet before sunset Saturday, but rain may hold off
in western ID (including the BOI metro) until around 7 PM MDT
Saturday evening, after which several hours of steady pcpn will
fall. SPC has a slight chance of thunderstorms in south-central
ID Saturday night, which we have also included in our forecast.
Accumulating snow will stay above 6500 feet while the bulk of
pcpn is falling.

&&

.LONG TERM /Sunday through Thursday/...
Issued 204 PM MDT THU OCT 29 2026
Showers will continue through Sunday, tapering off throughout
the day as the system departs. Snow levels Sunday will have
lowered to 5.5-7kft MSL (increasing from west to east). These
snow levels are higher than previous model runs consistent with
a faster system trend. Snowfall will likely be limited to the
mountains Sunday through Monday morning. In areas below the snow
level less than 0.1 inches of rain is forecast, with only a
trace to 0.03 inches forecast in the lower valleys. Sunday
afternoon and evening will feature gusty winds following the
cold frontal passage, with west to northwest gusts of 20-40 mph
in the Snake River Plain.

Beginning Monday, the area will be dry with a warming trend
through Thursday, although seasonable temperatures are
anticipated throughout. Fog and stratus is possible Monday
and Tuesday mornings with the recent precipitation and at the
beginning of the warming trend. While there will be multiple
opportunities for weak shortwaves to pass over the area,
moisture will be limited and the shortwaves will just result in
periods of increased high clouds.

&&

.AVIATION /00Z Friday through Saturday/...
Issued 555 PM MDT THU OCT 29 2026

Generally VFR with overcast skies tonight. Light rain will move
in from the south tomorrow morning, with MVFR ceilings in
higher terrain. A 30% chance of thunderstorms exists in the
Magic Valley tomorrow afternoon. Surface winds: SE-SW 5-10 kt.
Winds aloft at 10kft MSL: SW 15-25 kt.

KBOI...VFR. Light rain moving in from the south early tomorrow
morning. Surface winds: E-SE 5-15 kt.

Weekend Outlook...Isolated to scattered showers Sat/AM,
becoming widespread Sat/PM. Precipitation continuing through
Sunday, tapering off from W-E through the afternoon. VFR-MVFR in
rain showers, IFR-LIFR in mountain snow. Mountain obscuration
this weekend. Snow levels: 6.5-8.5 kft MSL Saturday, lowering to
5.5-6.5 kft MSL Sunday. Surface winds: SW-SE 5-15 kt Saturday,
then W-NW 10-20 kt with gusts to 20-30 kt behind a cold front
Sunday.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.

OR...None.

&&

$$

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AVIATION.....SA
SHORT TERM...LC
LONG TERM....JM