textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Gusty winds today, resulting in critical fire weather conditions in southeastern Oregon.

- Scattered showers/thunderstorms in Idaho today with outflow gusts as strong as 60 mph and blowing dust.

- Much cooler Tuesday through the rest of the week as precipitation continues.

SHORT TERM /Through Wednesday Night/

Issued 241 PM MDT MON MAY 25 2026 Warm today with high temps 10-15 degrees above normal. A strong cold front will pass through eastern Oregon tonight and western Idaho tomorrow morning. Ahead of the cold front, high based showers and thunderstorms are developing in SW Idaho highlands and in Central Idaho Mountains. These storms are capable of producing outflows 40-60 mph in an environment with 1000 J/kg of DCAPE. Also ahead of the front, winds across the area are increasing. In SE Oregon, sustained winds of 20-30 mph and gusts up to 40 mph with dry conditions have prompted the issuance of a Red Flag Warning. Winds in SW Idaho will be slightly lower, 10-20 mph sustained and gusts up to 30 mph outside of thunderstorms. Winds will also kick up blowing dust, locally reducing visibility and air quality. While storms today are high based and dry, tonight and tomorrow behind the front precipitation chances increase and temperatures drop down to near normal. Scattered showers continue over the region through Wednesday, with storm total rainfall amounts around 0.25 inches for much of the area, lower in the Snake Plain and higher over mountains. Thunderstorms are possible each afternoon/evening with gusty winds and heavier rainfall rates.

LONG TERM /Thursday through Monday/

Issued 241 PM MDT MON MAY 25 2026 An active weather pattern will continue through most of the long-term period, as the upper low lingering over the Great Basin will continue widespread showers and thunderstorms Thursday through Saturday. Temperatures will mostly hover near or slightly below normal through the end of the week. An upper trough will slowly steer into the northwest region from off the coast of British Columbia over the weekend. There is strong guidance agreement that this larger system will swallow the low over the Great Basin and steer it as a shortwave trough over our area. This pattern will likely continue widespread showers and thunderstorms on Saturday. Sunday will likely see showers/thunderstorms over higher terrain as this merged system moves out, before a broad ridge builds in and returns warmer and drier conditions early next week.

AVIATION /00Z Tuesday through Wednesday/

Issued 651 PM MDT MON MAY 25 2026

Generally VFR. Scattered showers thunderstorms lingering over NE Oregon and SW Idaho through evening. Thunderstorms capable of 30-45 kt outflows and blowing dust. Showers increasing across eastern OR early Tue/AM, with ceilings lowering to MVFR near KBKE/KBNO. Surface winds outside of storms: SE-SW 10-20 kt with gusts to 15-35 kt this evening. A cold front tonight will switch winds to W-NW 10-25 kt with gusts to 25-40 kt, strongest near KBKE/KONO. Winds aloft at 10kft MSL: S-SW 10-30 kt.

KBOI...VFR. Occasional weak showers/virga overnight through Tuesday morning. Showers will increase Tuesday afternoon, with a 20% chance of lightning. Surface winds outside of storms: S-E 5-15 kt. Cold front will shift winds to W-NW around 26/06Z, with NW 5-15 kt behind cold front. Period of gusts to 20-25 kt possible with frontal passage.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...Red Flag Warning until 8 PM PDT this evening for ORZ670-672.