A fire line now surrounds the fire, which is burning west of Boulder, and 178 firefighters, and 50 trucks, will battle the flames on Monday.
Authorities made more than 1,000 calls to residents ordering them to evacuate and warned an additional 2,200 to get ready to leave if conditions worsened, said Gabi Boerkircher of the Boulder Office of Emergency Management.
"There was minimal spread within the footprint", Cmdr.
Firefighters were sent to combat the wildfire, detected at 1:30 a.m. local time (07:30 GMT) on Sunday, and people were told to evacuate the area, according to NBC broadcaster, citing the Boulder County Sheriff's Office. We are not able to use aircraft in the middle of the night, evacuations are harder-so we are going to keep the mandatory evacuation order in place.
"The weather forecast is concerning", Wagner said.
Forecasters have issued a Red Flag Warningfor the area because of warm temperatures and dry conditions.
He said smoke was pouring toward neighborhoods, and many dead trees were combusting and sending black smoke into the air less than a half-mile from his home.
No injuries or structure damage were reported during the events.
Thousands of people living in the U.S. state of Colorado had to leave their homes due to the spread of wildfire in the Boulder County, Sputnik reported. The first started burning Sunday morning, and authorities said it may have been human caused, the report said. Mike Wagner says the fire originated in an area used by hikers and transients for camping.
Smoke rises from a wildfire Sunday, March 19, 2017, in Boulder, Colorado.
An early morning view of the fire.
High temperatures, low humidity, and a significant breeze mean conditions are flawless for the fire to spread.
Like Curtis in the morning, many onlookers began to gather by Canyon Road and at the base of Sunshine Canyon road for their own look at the smoke and flames.