Red Flag Warning

Locations Affected

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

Full Alert Message

URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 234 AM MDT Mon Oct 20 2025 ...RED FLAG WARNING NOW IN EFFECT FROM 9 AM THIS MORNING TO 6 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SOUTHERN FRONT RANGE FOOTHILLS, DENVER AND BOULDER METRO AREAS, PALMER DIVIDE, AND ADJACENT EASTERN PLAINS... * AFFECTED AREA...Fire Weather Zones 216, 239, 240, 241, 245, 246, 247 and 249. * TIMING...From 9 AM this morning to 6 PM MDT this evening. * WINDS...Northwest 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...As low as 14 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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