Jorn Olsen works for the Dutton-Lainson Co. in Hastings, Nebraska, and lives by Heartwell Park next to Hastings College. The other night he took these photos . The stadium lights are at the Hastings College stadium just east of his home.

The clouds are called Mammatus clouds . They do not precede a tornado, or foretell a storm, but are formed when the air is already saturated with rain droplets and/or ice crystals and begins to sink. The worst of the storm is usually over when these kinds of clouds are seen.

They are quite rare, but really beautiful.