Red Flag Warning

Locations Affected

Aurora, CO ∙ Denver, CO ∙ Fort Collins, CO ∙ Lakewood, CO ∙ Thornton, CO ∙ Centennial, CO ∙ Westminster, CO ∙ Boulder, CO ∙ Arvada, CO ∙ Greeley, CO

Full Alert Message

URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1151 PM MDT Wed Apr 22 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 7 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SOUTHERN FRONT RANGE FOOTHILLS, URBAN CORRIDOR, AND PLAINS... ...RED FLAG WARNING WILL EXPIRE AT MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SOUTHERN FRONT RANGE FOOTHILLS, URBAN CORRIDOR, AND PLAINS... * AFFECTED AREA...Fire Weather Zones 216, 238, 239, 240, 241, 242, 243, 244, 245, 246, 248, 249, 250 and 251. * TIMING...From 11 AM to 7 PM MDT Thursday. * WINDS...Northwest 15 to 25 mph with gusts up to 40 mph, with gusts up to 50 mph across the southern Front Range Foothills and South Park through early Thursday afternoon.. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior.

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