textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Warm and dry conditions through the weekend, with high temperatures 5 to 10 degrees above normal.

- Active pattern returning cooler conditions and precipitation chances Wednesday through Friday.

SHORT TERM /Through Sunday Night/

Issued 347 AM MDT FRI OCT 16 2026 The upper-level ridge centered over the western CONUS will keep temperatures warmer than normal today with clear skies. Dry surface layer conditions with weak winds will contribute to vast temperature differences from early morning lows, aided by radiational cooling, to peak heating during the afternoon. On Saturday, a weak upper-level shortwave trough will move inland across the Pacific Northwest and southern Canadian provinces. This will erode the western periphery of the ridge, combining with a weak upper-level low moving north out of Baja California to put the area in weak southwesterly flow aloft. While moisture remains sparse with this system, the pressure gradient will tighten slightly to generate localized afternoon breezes. Sunday will see this weak southwesterly flow aloft continuing.

LONG TERM /Monday through Friday/

Issued 347 AM MDT FRI OCT 16 2026 Temperatures will remain about 5 to 10 degrees above normal on Monday, however the pattern change will be actively underway. Through the rest of the week, a high amplitude trough will become a cut off low in southern California and linger in the Great Basin. As the trough builds along the West Coast Monday evening, increasing clouds and breezy conditions in SE Oregon are expected. Temperatures will cool off Tuesday as a front move through, cooling temperatures down to near-normal; low-mid 60s for the afternoon high in lower elevations, low 50s for mountain valleys. The cloud cover and increasing chance of precipitation Tuesday evening through Thursday evening could help to moderate temperatures further, however precipitation confidence at this time is low.

AVIATION /18Z Friday through Saturday/

Issued 1230 PM MDT FRI OCT 16 2026 VFR with mostly clear skies. Smoke from prescribed burns will locally reduce visibility. Local LLWS will develop overnight near the top of the inversion in the lower Snake Plain. Surface winds: E-SE 5-15 kt through Saturday. Winds aloft at 10kft MSL: SW 15-25 kt.

KBOI...VFR with easterly winds through Saturday.

Weekend Outlook...VFR conditions, with periods of high cloud cover. Breezy easterly winds on Saturday will drop to 10 kt or less on Sunday. Winds aloft will remain out of the SW.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.