Colorado, Wyoming Red Flag Warning | Effective 04/21/2026 12:15

Headline: 
Red Flag Warning issued April 21 at 1:15PM MDT until April 23 at 12:00AM MDT by NWS Denver CO
Event: 
Red Flag Warning
Urgency: 
Expected
Effective: 
April 21, 2026 - 12:15pm
Expires: 
April 21, 2026 - 11:15pm
Description: 
* AFFECTED AREA...Fire Weather Zone 215. * TIMING...From 10 AM Wednesday to midnight MDT Wednesday night. * WINDS...West 20 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...5 to 8 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.
Instruction: 
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.
Area Description: 
Larimer and Boulder Counties Between 6000 and 9000 Feet
Forcast Office: 
NWS Denver CO