A barn with its roof peeled back like a tin can and a tangled power poles northeast of London, Ont. were the work of a small tornado, according to environment Canada.

Post-storm analysis in the wake of the thunderstorm that tore through the Thamesford Ont., area on April 11 proves a twister with peak winds up to 150 km/h was responsible for the damage.

A team of Western University investigators helped Environment Canada determine it was a small tornado that ripped the roof off a barn northeast of London, Ont. (Harry Schut/Fotoschut Photography)

The investigation, carried out by Western University and Environment Canada, concluded the EF-1 tornado left a path approximately 11 kilometres long and 200 metres wide.