On July 31, 1987, Edmonton, Alberta was hit by an F4 tornado. This day is known as Black Friday. It was one of 7 tornadoes in Central Alberta on that day. The tornado was on the ground for over an hour, cutting a swath of destruction 30.8 km (19.1 mi) in length and 1.3 km (.81 mi) wide in some places. It killed 27 people and injured more than 300, destroyed more than 300 homes, and caused more than $332.27 million (equivalent to $796 million in 2025) in property damage at 4 major disaster sites. The loss of life, injuries, and destruction of property made it the worst natural disaster in Alberta's history and the second deadliest in Canada's history. Did you know about this tragic event?