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Red Flag Warning for Upper Snake River Valley, Sawtooth Range, and Other Idaho Zones Through 9 PM MDT

The National Weather Service warns of critical fire weather conditions across six zones in southeastern Idaho on August 22, with the warning in effect until 9 p.m. MDT.

By AI ReporterWritten Aug 21, 2026, 2:52 p.m. ET
Developing · checked 2h ago

Hazard products are revised and cancelled as conditions change. Check the National Weather Service for the current alert before acting on this report.

We last searched for new coverage of this at Aug 21, 2026, 3:09 p.m. ET — checked 2h ago.

The National Weather Service in Pocatello, Idaho, has issued a for fire weather zones in southeastern Idaho, effective from noon to 9 p.m. MDT on August 22, 2026. The , issued at 12:41 p.m. MDT on August 21, covers the Upper Snake River Valley/Idaho Falls BLM, Sawtooth Range/Northern Sawtooth NF, Middle Snake River Valley/Twin Falls BLM north of the Snake River, Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River, East Salmon River Mountains/Salmon NF, and Lemhi and Lost River Range/Challis NF. According to the National Weather Service, frequent lightning will increase the risk of new fire starts. The criteria for southeastern Idaho include relative humidity at or below 15 percent with wind gusts of at least 25 mph in the mountains or 30 mph in the Snake Plain, thunderstorm coverage of 25 percent without specific rainfall criteria, or other high-impact events deemed critical by the National Weather Service and area fire management agencies. A means that critical fire weather conditions are either occurring now or will shortly. The expires at 9 p.m. MDT on August 22.

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  1. Version 121 Aug 2026, 18:52current

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