Norwich, ON F2 Tornado of August 12, 1990

Oxford - Brant

A strong late-evening tornado impacted Norwich Township in southern Ontario on August 12th. Figure 1 depicts the surface analysis at 8:00 pm EDT, where a warm front is observed lifting over Lake Huron. This leads us to believe that the storm was likely initiated by a lake-breeze boundary originating from Lake Erie.

The tornado developed on the north side of town after dark and resulted in a few injuries and sadly, one fatality. The direction of the tornado’s track was estimated based on geostrophic flow, which had east-northeasterly flow aloft.

Figure 1. Surface analysis at 00Z on August 13, 1990 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017).

According to Environment and Climate Change Canada (2018), an F2 tornado touched down at 9:00 pm EDT near Norwich Township, ON. The track and width of the tornado was not documented by ECCC. The tornado caused two injuries and one fatality, but caused no property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Tue Aug 15 1989. Retrieved from:

Environment and Climate Change Canada Data. (2018). Canadian National Tornado Database: Verified Events (1980-2009) – Public. Retrieved from: