Active Weather Alerts
Red Flag Warning
Issued: 3:05 AM Aug. 17, 2025 – National Weather Service
...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SUNDAY FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 411, 413, 422, 427, 475, AND 476... The National Weather Service in Pocatello has issued a Red Flag Warning for scattered thunderstorms, which is in effect from noon to 9 PM MDT Sunday. * AFFECTED AREA...Fire Weather Zone 410 Upper Snake River Valley/Idaho Falls BLM, Fire Weather Zone 411 Centennial Mountains and Snake River Range/Targhee NF, Fire Weather Zone 413 Caribou Range/Caribou NF, Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF, Fire Weather Zone 427 Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River, Fire Weather Zone 475 East Salmon River Mountains/Salmon NF and Fire Weather Zone 476 Lemhi and Lost River Range/Challis NF. * THUNDERSTORMS...25 to 40 percent coverage. * OUTFLOW WINDS...A dry low-level environment will promote stronger storms capable of producing wind gusts up to 45 to 55 mph. * IMPACTS...Critical fire weather conditions are expected Sunday afternoon and evening. Lightning may generate new fire starts. Any new fire starts or existing fires may spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and 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. - Other high impact events deemed critical by the National Weather Service and area fire management agencies. &&
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