Earlier, the Boulder Police Department had asked for the voluntary evacuation of an area around the Diagonal Highway and 63rd Avenue as winds pushed the fire across the highway, according to police spokeswoman Kim Kobel.

"Residents should leave or be ready to evacuate," Kobel said just after 4 p.m. "There are also downed power lines in the area, which make it extra dangerous for residents and firefighters."

Officials used the Everbridge notification system to inform 1,300 households of the fire.

The Diagonal Highway was closed in the area during the height of the fire, which grew to 45 acres before it was contained.

Officials are anticipating that high winds could pick up ash and dust. Individuals with respiratory concerns are advised to stay indoors and limit their exposure to particulate matter. Firefighters are planning to remain on scene throughout the night to monitor and respond to any potential hot spots.

The city-county Emergency Operations Center was activated and updates, including road closures information, were being posted at www.boulderoem.com/emergency-status.