textproduct: Boise

KEY MESSAGES

- Very hot, dry, and breezy to end the week.

- Areas of smoke will continue through the weekend, mainly in the morning and overnight hours.

- Critical fire weather conditions, mainly over southeast OR and high terrain of southwest ID, through Saturday evening.

SHORT TERM /Through Sunday Night/

A warming and drying trend will start today, with temperatures climbing to over 100 degrees throughout much of the lower Snake Plain. As such, a heat advisory will continue through Saturday evening. Lingering monsoonal moisture will favor isolated thunderstorms over the Magic Valley in the afternoon today, and again Saturday afternoon. An upper low steering into the Pacific northwest coast will bring elevated southwesterly winds through the weekend, while keeping our area on the dry side. Hot, dry, and windy conditions will persist through Saturday across eastern Oregon and higher terrain of southwest Idaho, leading to critical fire weather conditions this afternoon through Saturday evening. Sunday will see dry conditions across all areas, and slightly lower temperatures hovering in the mid 90s for the Snake Plain. Sunday will also see lowered wind gusts across all areas. Wildfire smoke will linger over the area, most notably each night and morning before mixing out during the afternoons from the elevated southwest winds.

LONG TERM /Monday through Friday/

Come Monday, the upper trough over the northwest coast will keep our area under a southwesterly flow on the dry side. Tuesday through the end of the week will generally see the return of hotter conditions, as the strong high pressure ridge off the Great Basin builds back in over the entire western CONUS. This ridging pattern will still allow some monsoonal moisture to reach south-central Idaho around midweek, favoring a slight chance of afternoon thunderstorms mainly near the Magic Valley and the Idaho-Nevada border. Otherwise, areas will generally be warm, dry, and breezy throughout the extended forecast.

AVIATION /06Z Friday through Saturday/

Issued 1058 PM MDT THU JUL 23 2026 Hazy conditions overnight continue as smoke settles back in. High density altitude due to heat tomorrow afternoon. Isolated storms will develop this afternoon in the Magic Valley, capable of producing gusty winds, lightning, and small hail. Surface winds: becoming light and variable overnight, SW-NW 5-15 kt with gusts up to 25 kt develop Friday afternoon. Winds aloft at 10kft MSL: S-SW 10-25 kt.

KBOI...VFR. Clear overnight outside of settling smoke bringing hazy conditions tomorrow. Surface winds: variable less than 10 kt becoming SE tonight.

Weekend Outlook...Areas of wildfire smoke continuing with MVFR visibility during late night and morning hours, improving each afternoon. High density altitude due to heat. Isolated showers and thunderstorms across the Magic Valley each afternoon. Mostly clear elsewhere. Surface winds: SW-NW 5-15 kt with gusts to 25 kt, except 10-20 kt with gusts to 30 kt on Saturday.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Air Quality Alert until 2 PM MDT this afternoon for IDZ011-012- 014-033. Red Flag Warning from 2 PM this afternoon to 9 PM MDT Saturday for IDZ401-402-423. Heat Advisory until 9 PM MDT Saturday for IDZ012-014-016-033. OR...Air Quality Alert until 2 PM MDT /1 PM PDT/ this afternoon for ORZ061>064. Red Flag Warning from 2 PM MDT /1 PM PDT/ this afternoon to 9 PM MDT /8 PM PDT/ Saturday for ORZ670>675. Heat Advisory until 9 PM MDT /8 PM PDT/ Saturday for ORZ063- 064.