textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Isolated to scattered showers and thunderstorms this afternoon and evening across east-central Oregon and west-central Idaho, with lower potential to the south.

- Hot, dry, and windy this afternoon and evening with critical fire weather conditions in the Owyhee Mountains and Magic Valley.

- Gusty winds along a cold front tonight. Continued breezy into the weekend, strongest on Saturday. - Temperatures fluctuate late this week into the weekend between 10 degrees above normal and slightly below normal.

SHORT TERM /Through Friday Night/

Issued 303 AM MDT WED JUN 3 2026 A shortwave trough and cold front will move across the area this afternoon and evening. The center of the trough will move across northern areas, resulting in scattered showers and isolated thunderstorms across east-central Oregon and west- central Idaho, with a lower potential (10-20% chance) across the Treasure Valley and points south. Moisture will be limited, with gusty outflow winds to 40 mph and lightning the primary hazards from any thunderstorms. Blowing dust is also possible from outflow gusts.

High temperatures today will be around 10 degrees above normal across southwest Idaho, but near normal across portions of southeast Oregon where the cold front will arrive sooner. Winds ahead of the front will become breezy with gusts 20-35 mph, and combined with low humidity across southwest Idaho will result in critical fire weather conditions in and around the Magic Valley and Owyhee Mountains. The front will move across southeast Oregon this afternoon and southwest Idaho this evening with gusts to around 40 mph and blowing dust possible along the front. Winds will stay gusty overnight especially along the I-84 corridor in southeast Oregon and in the Snake Plain of southwest Idaho. On Thursday, winds will subside in most areas except east of Boise through the Magic Valley where gusts 20-35 mph will continue. Temperatures will cool to near normal behind the front. On Friday, southwest flow associated with an upper trough approaching the Pacific Northwest and an amplifying ridge to our east will boost temperatures by around 10 degrees with breezy conditions developing, especially over the higher terrain.

LONG TERM /Saturday through Wednesday/

Issued 303 AM MDT WED JUN 3 2026 An upper level trough will move into the Pacific Northwest to our north over the weekend. This will push a mostly dry cold front through our area, bringing gusty winds and cooler temperatures. Highs over the weekend will be up to 5 degrees below normal. The strongest winds are favored to arrive late Saturday with gusts 30-45 mph. A 10-20% chance of showers and thunderstorms will develop across the northern mountains with lower chances to the south. Another upper level trough is expected to move into the Pacific Northwest early next week. Differences between the ensembles in timing and strength decrease forecast confidence. Overall, model blends favor a slight warmup ahead of the trough early next week, but cooler temperatures become more likely by midweek as the trough moves inland. Shower and thunderstorm chances increase to 15-40% by Tuesday and Wednesday, with the highest chances across the northern mountains.

AVIATION /12Z Wednesday through Thursday/

Issued 545 AM MDT WED JUN 3 2026 Mainly VFR. Scattered showers and isolated thunderstorms develop across eastern Oregon late this morning, spreading towards west-central Idaho this afternoon. Timing for possible terminal impacts is after 20Z at KBKE/KBNO, and after 23Z at KONO/KMYL. Showers/storms exiting the area this evening. Blowing dust possible from outflow winds to 35 kt. Surface winds: variable less than 10 kt this morning, becoming SW 5-15 kt with gusts to 25 kt this afternoon, then NW 10-20 kt with gusts to 30 kt this evening. Winds aloft at 10kft MSL: SW-W 15-25 kt.

KBOI...Mainly VFR. 30% chance of MVFR after 22Z as outflow winds up to 30 kt from nearby showers/thunderstorms may produce blowing dust late this afternoon into early evening. Surface winds: SE 5-10 kt this morning, becoming NW 8-15 kt with gusts to 25 kt by late afternoon and evening.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.