Red Flag Warnings in effect across five states as critical fire-weather conditions develop
The National Weather Service (NWS) has Red Flag Warnings in effect across parts of Montana, Wyoming, North Dakota, Idaho and South Dakota on September 10, 2026, as very low relative humidity, dry vegetation and gusty winds produce critical fire-weather conditions across the northern Rockies and northern Plains. Minimum relative humidity may fall as low as 5% in southeastern Wyoming, while wind gusts may reach approximately 65 km/h (40 mph) in parts of Wyoming and Montana.

