Cloud seen on May 21, 2014. At Tower and Smith Road.
Photo of tornado in Watkins, from the Adams County Sheriff's Office.
The Big Blue Horse against a dark and ominous sky. Picture from Ciera Howard.
Passengers inside Denver International Airport take pictures of the storm near the airport. Pic from Jared Shure, via Twitter.
Golf ball-size hail
The thunderstorm toppled this tree onto an Aurora house near I-70 and I-225 on May 21, 2014. (Photo by Chris Morriss, 7NEWS)
Hail at Dick's Sporting Goods Park in Commerce City (Photo: AIRTRACKER7)
Noam sent us the photo of a hail-covered parking lot on May 21, 2014.
Hail punctured this fence in Green Valley Ranch. (Photo by Molly Hendrickson, 7NEWS)
Viewer Tabbatha Spencer sent this photo of heavy flooding at East 56th Avenue west of Havana Street on May 21, 2014.
Dark cloud and storm near Denver International Airport on May 21, 2014. Photo from Ciera Howard .
Flooding at Fairfax Park in Commerce City. (Photo by Airtracker7)
Crews clear the field at Dick Sporting Goods Park.
Snow plow moving hail off road near Denver International Airport. (Kirsten Horne, 7NEWS)
Hail shredded this Jeep window. (Photo by Molly Hendrickson, 7NEWS)
A viewer sent us this photo of hail on 61st Way in Commerce City on May 21, 2014.
5 inches of hail at 67th Avenue and Tower Road in Denver from the Denver Police Department on May 21, 2014.
Viewer Carolyn Stifflear took this photo near East Quincy Road at South Picadilly Street in Aurora on May 21, 2014.
Viewer Linda Nevin took this photo from the Southlands area of Aurora on May 21, 2014.
Viewer "Grandma Sherri" sent us this great photo of hail in the forest from Shadow Mountain Drive in Conifer on May 21, 2014.
Street flooding at Martin Luther King Boulevard and Magnolia Street in Denver on May 21, 2014.
A tow truck hauls a car through flooding under a railroad bridge at Brighton Blvd. and York St. in Denver on May 21, 2014. (Photo by Kirsten Horne, 7NEWS)
Cars churn through flood waters at Brighton Blvd. and York St. in Denver. (Photo by Alan Stedman, 7NEW)
Wall cloud in northeast Denver on May 21, 2014.
Viewer Michael Bell took this photo near Children's Hospital in Aurora when a tornado warning was issued on May 21, 2014.
Mark Koudelka captioned this photo: View of the storm heading toward DIA
Street flooding at East Eighth Avenue and Colorado Boulevard in Denver on May 21, 2014. (Photo by Justin Beach, 7NEWS)
Viewer Alyson Hershelman took this photo of quarter-size hail falling at South Colorado Blvd. at I-25 in Denver on May 21, 2014.