From a downed sign that stopped rush-hour traffic on I-25 to hundreds of flight delays and cancelations at Denver International Airport to uprooted trees — wind gusts reaching close to 65 mph wreaked havoc across metro Denver on Monday. 

The National Weather service kept the high-wind warning in effect through 6 a.m. Tuesday for the Front Range foothills. 

As of 3:30 p.m., more than 1,022 flights in and out of DIA had been postponed or canceled, according to FlightAware.com. 

A massive overhead sign blew onto I-25 on Monday morning, closing down all lanes of travel just north of downtown Denver, according to a social media announcement from Adams County Fire Rescue.

The call about the incident was received at about 4:36 a.m., with the sign down on the interstate just north of 53rd Avenue. Crews arrived at the scene and cut the sign pole to make it possible for vehicles to travel through the stretch of road. The sign was then pushed off of the road with a bulldozer.

According to Adams County Fire Rescue, one semi truck was damaged as it tried to miss the fallen sign. There have been no reported injuries as a result of the incident.

As of 5 p.m. Monday, Xcel Energy’s map  still showed 21 outages, affecting 1,580 customers — mostly in the foothills west of Denver. That number reached as high as 7,500 at times. 

Meanwhile, red flag warnings and fire weather watches were in place for the San Luis Valley and southern portions of the Front Range and eastern plains. These areas should watch for strong winds, paired with very dry air, to increase fire danger, the weather bureau said.  

Red Rocks officials canceled a Hippo Campus concert scheduled for Monday night, citing the strong wind. The show will not be rescheduled, according to AEG, so refunds are available. 

As strong winds ripped across El Paso County, increasing fire danger and pulling down trees and power lines in their wake, Pikes Peak regional emergency officials urged residents to take diligent precautions and report emergencies to help mitigate damage and keep communities safe.

“Be vigilant, be prepared, share the responsibility with us. If you see something, say something,” Colorado Springs Fire Department spokeswoman Ashley Franco said at a 10 a.m. press conference to address the regional emergency response.

Fire danger remained top of mind as a fire was reported on the summit of Cheyenne Mountain — but it was quickly extinguished Monday morning.

According to Capt. Jamal Davis with the Broadmoor Fire Department, the fire was reported shortly after 8 a.m. on Transmitter Road and was under control by 9:30 a.m.

No injuries were reported, and no wildlife or structures were threatened, he said.

OutThere Colorado reporter Spencer McKee, The Gazette’s Breeanna Jent and the Denver Gazette’s news partners 9NEWS contributed to this report.