HIGHLANDS RANCH, Colo. (CBS4)– After a severe thunderstorm moved through Highlands Ranch on Friday an unusual weather phenomenon took place. CBS4 Meteorologist Chris Spears was storm chasing along C-470 when he came upon several banks of hail fog near the University Boulevard exit.

(credit: CBS)

Hail fog forms as the air just above a thick blanket of fresh hail cools down to the dew point temperature.

The fog is typically shallow and just a few feet above the ground when the surface winds are light.

(credit: CBS)

It lasts less than 30 minutes in most cases.

Chris Spears