This season has gotten off to a decent start in terms of severe weather across Southern Ontario.

April 11th certainly was no exception.  Ontario, as well as Canada’s first verified tornado of the season touched down near Thamesford, ON, just NE of London, ON.

A group from Western University documented the damage, and along with eye witness reports, Environment Canada was able to confirm an EF-1 Tornado.  EC summary below.

*Note, the above image is not the Tornado that touched down.


Weather summary
for Ontario and the National Capital Region
issued by Environment Canada
at 9:57 a.m. EDT Thursday 27 April 2017.


On April 11th, a thunderstorm that developed over southwestern 
Ontario intensified northeast of London, Ontario causing damage to a 
barn roof and downed trees and hydro poles. After an analysis of 
witness reports and a damage survey conducted by Western University, 
a post-storm investigation by Environment Canada has concluded that 
the damage was the result of both a tornado with peak winds up to 
150 km/h, rated EF-1 on the Enhanced Fujita Scale, in addition to 
downburst winds. The tornado path was approximately 11 km long and 
200 m wide.

Please note that this summary may contain preliminary or unofficial 
information and does not constitute a complete or final report.