Red Flag Warnings and Fire Weather Watches are in effect across portions of Minnesota, Nebraska, Wyoming, and Alaska, with six active alerts flagging dangerous fire weather conditions driven by gusty northwest winds and critically low relative humidity across a wide corridor of the Northern Plains, central Rockies, and subarctic interior.
Minnesota’s northeastern corner is under a Red Flag Warning covering four areas: North St. Louis, Northern Cook and Lake, Central St. Louis, and Southern Lake. The National Weather Service cites northwest winds of 5 to 15 mph with gusts up to 30 mph and relative humidity dropping as low as 23 percent. Forecasters warn that any fires developing under those conditions will spread rapidly, and outdoor burning is not recommended.
The most extreme readings are forecast for the Nebraska Panhandle. The National Weather Service in North Platte has issued a Fire Weather Watch — running from noon through 9 p.m. MDT Monday — covering the Eastern Panhandle and Crescent Lake National Wildlife Refuge, the Pine Ridge and Nebraska National Forest zone, the Lodgepole Creek and Southern Panhandle corridor, and the Box Butte, South Sioux, and Niobrara River areas, among others. Northwest winds of 15 to 25 mph with gusts up to 40 mph are expected, with humidity as low as 15 percent. Residents near Scottsbluff and across Dawes County are within the watch footprint.
Wyoming faces conditions at the severe end of the spectrum. The National Weather Service in Cheyenne has issued a Fire Weather Watch covering eight fire weather zones Monday afternoon through Monday evening, including the Thunder Basin National Grassland, the Niobrara lowlands, and communities near Bordeaux, Chugwater, and Wheatland. Forecast northwest to north winds of 15 to 25 mph with gusts up to 35 mph, combined with humidity between 10 and 15 percent, prompted forecasters to warn that any fires that develop will likely spread rapidly. Residents across the affected zones, including those near Cheyenne, should monitor for possible upgrades to full Red Flag Warnings.
Alaska extends the geographic reach of the event, with active alerts for the Delta Junction area and the Yukon Flats — expansive interior terrain where low humidity and dry vegetation create elevated fire risk through the warmer months.
A Red Flag Warning indicates that critical fire weather conditions are either occurring now or imminent, the result of the combination of strong winds, low relative humidity, and warm temperatures. A Fire Weather Watch, one tier below, signals those conditions are forecast and may prompt an upgrade as the pattern evolves.
The six-alert pattern reflects a broad northwest flow delivering dry continental air across hundreds of miles of fire-prone terrain. The National Weather Service advises all residents in affected zones to avoid outdoor burning and to have suppression resources available.