CHEYENNE, Wyo. (AP) — The annual air show during Cheyenne Frontier Days in Wyoming has been canceled because of poor weather conditions.

Officials say the U.S. Air Force Thunderbirds could not perform the show Wednesday morning because of low cloud cover.

They say it was not possible to reschedule the show.

The Thunderbirds have performed at Frontier Days for more than 60 years and the free event attracts thousands of spectators.