Posted At: July 31, 2007 @ 12:52 PM
Posted By: Reed Timmer
Related Categories: Tornadoes
Fig. 1. F-4 tornado near Refinery Row - Edmonton, AB at ~3:30 pm MDT.
On this date 20 years ago, July 31, 1987, an F-4 tornado ripped through the southeastern side of Edmonton Alberta between 3:00 and 4:00 pm MDT. Sadly, 27 people lost their lives because of this violent tornado with hundreds more injured, hence this day was named "Black Friday". The tornado touched down 25 km southwest of Edmonton in Leduc County, and was on the ground for over an hour, creating a 40 km long path of total devastation and $330 million in property damage. The following is a time line of events as this tornado emergency unfolded:
1:40 pm MDT: Severe thunderstorm watch issued for the City of Edmonton and Leduc, Parkland, and Strathcona Counties.
2:45 pm: Severe thunderstorm warning issued for the area.
2:52 pm: Weather Radio Canada emergency tone activated for Edmonton Transmitter.
2:59 pm: Tornado reported to weather office by citizen of Leduc County, 25 km south of Edmonton.
3:04 pm: Tornado warning issued.
3:25 pm: F2-F3 tornado strikes Mill Woods, on the southeast side of Edmonton.
3:30 pm: F-4 tornado tears through Refinery Row, killing 12 and injuring many more.
4:25 pm: F3-F2 tornado dissipates after extensively damaging Evergreen Trailer Park.
Here are some pictures of the tornado at various stages of its life cycle: