# Weather alerts in Sawtooth Forest and East Idaho

> Live situation record from CLSTR: https://clstr.news/situations/weather-alerts-in-sawtooth-forest-and-east-idaho
> Updated: 2026-09-12T21:02:27.000Z. Sources: 5. Developments: 2.

In early September, a Red Flag Warning was issued for the Sawtooth Forest due to thunderstorm activity and frequent lightning. During this period, wind gusts between 30 and 40 mph were expected across the upper Snake River Plain and the Arco Desert.

By mid-September, weather patterns in East Idaho shifted toward a cooling trend. A Red Flag Warning remained active for the southern portion of the Sawtooth National Forest, driven by low humidity and gusty winds. A Wind Advisory was issued for Arco, Mud Lake, and Dubois as gusts were expected to exceed 45 mph. Following a cold front, temperatures were projected to drop into the 60s before a warming trend returned them to the mid-70s later in the week.

## Timeline

### 2026-09-12: East Idaho weather: Cooling trend and high winds expected

East Idaho faces a cooling trend and high winds this weekend, including a Red Flag Warning for the southern Sawtooth National Forest and a Wind Advisory for several regions.

4 sources. https://clstr.news/cluster/east-idaho-weather-cooling-trend-and-high-winds-expected

### 2026-09-02: Sawtooth Forest Red Flag Warning issued due to thunderstorms

A Red Flag Warning is in effect for the Sawtooth Forest due to thunderstorms, with high winds expected across the Snake River Plain and Arco Desert.

3 sources. https://clstr.news/cluster/sawtooth-forest-red-flag-warning-issued-due-to-thunderstorms

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Cite as: Weather alerts in Sawtooth Forest and East Idaho. CLSTR, https://clstr.news/situations/weather-alerts-in-sawtooth-forest-and-east-idaho