textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Cool and dry this weekend, frost and freeze possible this morning and Sunday morning.

- Seasonable temperatures with an unsettled pattern bringing a chance of rain and high mountain snow early next week.

SHORT TERM /Through Monday Night/

Issued 144 AM MDT SAT OCT 24 2026 Dry conditions will prevail through Sunday thanks to brief ridging over the area. Clearing skies and calmer winds will allow for good radiational cooling this morning, with lower elevation lows in the low to mid 30s. This will be the case again come Sunday morning, although increasing high clouds may act to hinder frost development. High temperatures today will be near normal, before warming to around 5 degrees above normal come Sunday afternoon with increasing southwesterly flow ahead of the next system.

Come Monday, the brief ridging the made for a dry weekend will breakdown ahead of the next trough digging into the Mountain West. High temperatures on Monday will be similar to that of Sunday, if not a couple degrees warmer. Precipitation chances will increase through Monday with breezy (gusts to 20-30 mph, strongest south and west of the Snake River Plain) west/southwest winds. The most active period appears to come late Monday into early Tuesday, especially over the Central ID Mountains. This system won't have as much of a moisture tap as the prior one, with forecasted rain amounts under a half an inch over the Central ID Mountains. A cold front late Monday will lower snow levels to 5-6kft MSL, which will allow for some snow accumulations across higher terrain. Elevations above 6kft MSL in the Central ID Mountains have a 40-70% chance of seeing at least an inch of snow. The current forecast carries 1-3 inches above 6kft MSL (including Banner Summit), with up to 5 inches on the highest peaks.

LONG TERM /Tuesday through Saturday/

Issued 144 AM MDT SAT OCT 24 2026 The cold front mentioned in the short-term period will cool temperatures back down again, with highs back down near to around 5 degrees below normal... Where they will likely remain through the week. The unsettled pattern will continue throughout the coming week, with a 10-30% chance of precipitation each day, mainly over higher terrain. The next notable storm system looks to approach our area late next week into the early weekend. However the moisture availability to for it to tap into is still questionable. At the very least, it should offer up another cool down.

AVIATION /18Z Saturday through Sunday/

Issued 1114 AM MDT SAT OCT 24 2026 VFR with high pressure in control both at the surface and aloft today into Sunday. High clouds on the increase this afternoon and overnight ahead of an approaching Pacific trough. Surface winds light less than 10 kt, with ESE direction favored across south central Idaho and in/around KBKE. Increasing ESE gradient Sunday afternoon ahead of approaching trough.

KBOI...VFR with some mid/high clouds. Surface winds ESE less than 10 kt...increasing Sunday afternoon. Winds aloft at 10kft: W around 15 kt, increasing to SSW 20-30 kt after 18Z Sunday.

Sunday Outlook...VFR with increasing mid/high clouds. ESE surface gradient increasing after 18Z, with gusts over 20 kt possible south and east of KBOI and over portions of SE Oregon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.