The Northern Tornadoes Project have updated their assessment of the severe storm which hit the region last week.
The organization says a twister had touched down in the Kingsbridge area and made its way to Lucknow which caused much damage in its path. Preliminary review of ground and drone survey data shows at least one tornado had a EF2 rating.
The twister which swept across Lucknow is recorded wind speeds up to 180km an hour, a path width of 1.3km and a track length nearing 19km.
According to the organization, similar developments were seen near Harriston and a 2nd tornado was generated extingint to Kenilworth, rated as an EF1.
A tornado near Goderich also recorded at EF0.
