Governor Jared Polis has declared a state of emergency.
Thousands of people are being asked to evacuate immediately as winds feed rapidly spreading forest fires in Boulder County, Colorado.
Several small grass fires, triggered by sunken power lines in strong winds in central Colorado, have grown to raging flames Thursday afternoon, according to the Boulder County Sheriff.
Louisville, Colorado, with a population of about 20,000, is being asked to evacuate, according to the Boulder Office of Emergency Management. The entire city of Superior, Colorado, with a population of about 13,000 people, is also being asked to evacuate.
The National Weather Service of Denver / Boulder described the situation in Louisville as life-threatening in an alarm on Twitter Thursday afternoon, urging people to leave immediately.
Six patients were taken to UCHealth Broomfield, which serves the Boulder area, due to injuries from the fires, a spokesman for the hospital confirmed to ABC News.
Colorado fire officials told ABC News that the strong wind is making it difficult to get air resources into the area to fight the fires.
Gusts above 100 mph were reported in northern Jefferson County earlier Thursday, while parts of Boulder County experienced gusts above 80 mph. The city of Boulder also reported gusts above 70 mph on Thursday afternoon.
The Boulder area is currently suffering from extreme drought, according to the National Oceanic and Atmospheric Administration and the Department of Agriculture.
Colorado Governor Jared Polis has declared a state of emergency due to the fires in Boulder County, his office said.
“Prayers for Thousands of Families Evacuating from Superior and Boulder County Fires,” Polis tweeted. “Fast wind spreads the flames quickly, and all planes are set on fire.”
ABC News’ Jeff Cook, Dan Manzo, Jenna Harrison and Dan Peck contributed to this report.