textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Slightly warmer temperatures and dry conditions expected over most areas today.

- Light valley rain and mountain snow this evening in southeast Oregon, moving into southwest Idaho by Monday morning.

- Cooler and unsettled pattern continuing throughout the coming week, with valley rain and mountain snow expected through Friday.

SHORT TERM /Through Tuesday Night/

Issued 314 AM MST SUN NOV 15 2026 Breezy and dry conditions will continue for most areas this morning, with the southwest ID side seeing temperatures a few degrees above normal today as high pressure remains over the area. A slow-moving cold front, accompanied by a band of precipitation, will steer eastward across eastern OR this morning through early Monday, and then through southwest ID early Monday through Tuesday. Valley rain showers and mountain snow are expected with this frontal passage today through early Tuesday, before tapering off east by late Tuesday. Total rain accumulations for the valleys will remain on the lower side between 0.15-0.35 inches from today through late Tuesday, with amounts greater than 0.30 inches concentrated along the eastern OR side. Snow levels will stay between 5500-6500 feet MSL today through Monday, dropping off to 4500-5500 by Monday night. As such, higher elevation areas will see light snow accumulations today through Tuesday. For now, high mountain peaks are expected to see 4 to 9 inches of total snow by late Tuesday. The frontal passage will return a gradual cooling trend Monday through Tuesday. Following the frontal passage, a brief ridge of high pressure will return over the area late Tuesday through early Wednesday.

LONG TERM /Wednesday through Sunday/

Issued 314 AM MST SUN NOV 15 2026 The brief high pressure ridge over the area will quickly break down by Wednesday afternoon, as a closed Pacific upper low steers into the lower northwest and Great Basin. This system will bring a more prolonged precipitation event from Wednesday through the end of the week. Guidance continues to suggest the core of the low digging south of our area, steering abundant wraparound moisture and continuous precipitation over our area through late Friday. Continuous valley rain showers and mountain snow are expected Wednesday through late Friday. Lower valley areas are tentatively looking at around 0.20 inches of total rainfall. Latest long-range guidance has snow levels hanging in the 3500-4500 ft range through Saturday. Valleys can see a rain/snow mix, mainly on Friday. Higher mountain peaks can still see possible snow accumulations of 5 to 10 inches total by early Saturday. Not much cooling is expected with this system, and temperatures are expected to hang near or slightly below seasonal normals through Friday. Come early Saturday, the system will steer out of our area as a ridge builds back in. Saturday and Sunday will generally see slightly warmer temperatures and relatively drier conditions. Another Pacific trough is projected to steer into the region, but considerable uncertainty remains over its precipitation timing and intensity. For now, late Saturday through early Sunday will see slight chances of precipitation mainly over higher terrain areas.

AVIATION /18Z Sunday through Monday/

Issued 1026 AM MST SUN NOV 15 2026 Rain and mountain snow heading eastward, affecting KBNO/KBKE, with MVFR/IFR in low ceilings and mixed precip. Mountains obscured. As precip moves east later today, snow levels will lower to 5-6 kft MSL. Surface winds: S-SE 5-15 kt, with gusts to 25 kt, becoming more variable up to 10 kt this evening. Winds aloft at 10kft: SW 15-35 kt.

KBOI...VFR with BKN mid-high clouds moving in from the west. Surface winds: SE 10-15kt with gusts up to 25 kt possible, weakening later this afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.