By Chris Spears

DENVER (CBS4) – A storm system moving into the Rockies produced an ominous sky in southwest Colorado early Friday afternoon. Just east of Cortez a cold air funnel cloud was spotted by Brent McWhirter.

Cold air funnels are produced when there is extremely cold air high up near the jet stream level of wind, but the air closer to the ground warms enough to help trigger showers or weak thunderstorms. Cold air funnels are typically harmless and rarely touch the ground. If they do touch down the damage is usually equivalent to a weak, EF-0 rated tornado.

Read more about cold air funnel clouds by clicking here.

Chris Spears