Red Flag Warning in Boulder County, Colorado
Issued by the National Weather Service and archived by Claims Pages
EXPIRED
4/21/2026 11:53:00 PM (UTC)
Urgency: Expected
Severity: Severe
Certainty: Likely
4/21/2026 11:53:00 PM until 4/22/2026 3:00:00 PM
* AFFECTED AREA...Fire Weather Zones 214, 216, 238, 239, 240,
241, 242, 243, 244, 245, 246, 247, 248, 249, 250 and 251.
* TIMING...For the Red Flag Warning, from 10 AM Wednesday to
midnight MDT Wednesday night. For the Fire Weather Watch, from
Thursday morning through Thursday evening.
* WINDS...For the Red Flag Warning, west 20 to 30 mph with gusts
up to 45 mph. For the Fire Weather Watch, northwest winds
gusting up to 50 mph.
* RELATIVE HUMIDITY...For the Red Flag Warning, 5 to 8 percent.
For the Fire Weather Watch, as low as 10 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.




