It was an unusual day, as tornadoes don’t strike the metro every year, but there has been at least one tornado in the city seven out of the last ten years. Get inside if you’re in this area!” CBS Meteorologist Lauren Whitney warned at 3 p.m. That alert expired at 3:30 p.m., but another went into effect a few minutes later a little farther east. Tuesday and most of Wednesday will be cloudy, cool and wet at times across Colorado as the low pressure moves by. On June 6, 2020 an unusual “derecho” wind event crossed Colorado and caused 91 reports of wind reaching at least 60 mph. The vast majority of these reports occurred on a single day. This collision of air interacts with daytime heating and the terrain to fire up thunderstorms on an almost daily basis during the warm season. Hail up to 3 inches in diameter, strong winds to 60 mph and tornadoes will be possible with the stronger storms,” the National Weather Service in Boulder tweeted at 3:45 p.m. DENVER (CBS4) – Hail is virtually guaranteed in Colorado in May and June. ©2020 CBS Broadcasting Inc. All Rights Reserved. Weld County has the most reported tornadoes since 1950 — 268. Tornado Warning has shifted a little to the east, now over the town of Sterling. As warm, moist air flows into the Front Range from the southeast it will rise up and over the Palmer Divide and collide with cooler, drier air flowing off the foothills west of Interstate 25. But something has been different this year. In the Denver Metro area, Adams County (172) and Arapahoe County (89) have the most sightings. CBS4 spoke with Dr. Samuel Childs from the Department of Atmospheric Science at Colorado State University who explained a mostly persistent ridge of high pressure that has been over Colorado in recent months has helped deter the develop of large hail and tornadoes. Several Tornadoes Disrupt Memorial Weekend, Colorado Weather: Potent Storm Prompts Winter Weather Alerts For Entire State, Snow Helps Slow Spread Of East Troublesome Fire, Draft Horse, Donkey Released During Wildfire Found 'Singed And Hungry, But Healthy', Denver Weather: Arctic Blast With Snow And Record Cold On Sunday, Seven First Responders In Grand Lake Lose Homes To East Troublesome Fire, Snowy Roads And Highways Plagued With Crashes Sunday; CDOT Urges Drivers To Stay Home Monday, Accumulating Snowfall Mostly Done On Colorado's Front Range, See Monday a.m. Filed Under: Colorado News, Colorado Weather, Hail Damage, Hail Storm, Tornado Sirens, Tornado Warning DENVER (CBS4) – Hail is virtually guaranteed in Colorado in May and June. Large hail and confirmed tornado. #cowx pic.twitter.com/uiazIZ38Ye, — Lauren Whitney (@LaurenCBS4) May 27, 2019. Tornadoes: Weld County most active Weld County has the most reported tornadoes from 1950-2018* — 274. (source: Weld County). ©2020 CBS Broadcasting Inc. All Rights Reserved. Colorado’s two most tornado-prone counties are Weld and Adams, partly due to size, but also because of their proximity to a feature called the Denver Convergence Vorticity Zone, or DCVZ, which functions like a mini tornado-alley. Some warmer and drier weather is anticipated by the upcoming weekend. The ridge creates a west or southwest flow in the upper atmosphere which does not typically bring the moisture and instability necessary for damaging hail or destructive tornadoes. Tornadoes produced along the DCVZ are usually spawned from non-supercell thunderstorms and will have a relatively short life span, often 30 minutes or less. Tornadoes produced along the DCVZ are usually spawned from non-supercell thunderstorms and will have a relatively short life span, often 30 minutes or less. Snow is expected in the mountains and it could accumulate to several inches above 9,000 feet.