A tornado warning issued Thursday has ended for parts of central Alberta. Social Sharing CBC News · Posted: Jul 21, 2021 9:10 PM MT | Last Updated: July 22 Environment Canada issued thunderstorm warnings and tornado watches across central Alberta on Wednesday evening. This file photo by James Wilson was taken in 2020.(James Wilson/Twitter) comments A tornado warning issued Thursday as a powerful storm moved through central Alberta has ended. According to a critical alert issued by Alberta Emergency Alert Thursday around 9 p.m., a rotating severe thunderstorm that was possibly producing a tornado was located near Knob Hill, moving towards the northeast at 35 km/h.