The National Weather Service in Pocatello issued a Red Flag Warning for southeastern Idaho fire zones on Friday evening, July 11, alerting residents and land managers to critical fire weather conditions expected Sunday afternoon.
The warning takes effect at 1 p.m. Mountain Daylight Time on Sunday, July 12, and remains in force through 9 p.m. that evening. It encompasses Fire Weather Zone 410, which covers the Upper Snake River Valley and Idaho Falls Bureau of Land Management lands, as well as Fire Weather Zone 411, encompassing the Centennial Mountains, Snake River Range, and Targhee National Forest.
Dangerous Wind and Humidity Combine
Meteorologists expect southwest winds between 10 and 20 mph with gusts potentially reaching 35 mph throughout the afternoon and early evening. More critically, relative humidity is forecast to plummet to as low as 10 percent—a near-zero moisture level that can rapidly transform small ignition sources into large, fast-moving fires.
These conditions meet the criteria for a Red Flag Warning because the combination of elevated winds and extremely low humidity creates ideal conditions for fire growth. Any existing fires would spread rapidly, and new fire starts could quickly become unmanageable without immediate suppression efforts.
What Residents Should Know
During a Red Flag Warning, outdoor burning is prohibited in the affected zones, and residents should take precautions to prevent accidental ignition. This includes avoiding spark-producing activities such as welding or equipment use near dry vegetation, properly extinguishing campfires, and keeping vehicles off dry grass.
The timing of the warning coincides with peak summer fire season across Idaho and surrounding states. Recent brush fires in the Idaho Falls area have destroyed vehicles and outbuildings, underscoring the rapid spread potential when conditions align.
For those who live in or near wildland-urban interface zones—areas where homes and structures intermingle with natural vegetation—Sunday represents a particularly heightened risk period. Fire departments in the region have responded to multiple structure fires involving homes and vehicles, reflecting the intensity of summer fire response demands.
What Comes Next
The Red Flag Warning expires at 9 p.m. Sunday evening, though fire managers will continue monitoring weather patterns for subsequent days. Residents in Bonneville County and surrounding areas should remain alert to evacuation notices and be prepared to leave quickly if fire danger escalates in their vicinity.
Those with questions about fire safety or evacuation procedures can contact local emergency management or fire departments. For real-time fire information, the National Weather Service Pocatello office maintains updated forecasts and warnings on its website.