Parry Island, ON F1 Tornado of August 2, 1989

Parry Sound - Muskoka

This tornado occurred at 10:00 am, coming ashore at Parry Island, on the east shore of Georgian Bay. Trees were knocked down and siding torn from a home. To the east of there, there were unconfirmed reports that a house and two cottages were ‘completely destroyed’ at Otter Lake.

Figure 1 depicts a tough (labelled TROF), which initiated thunderstorms in the early morning hours of August 2nd. These thunderstorms spawned an F1 tornado that likely tracked southeast. The motion and length of the tornado was estimated based on geopotential heights and surface analysis.

Figure 1. Surface analysis at 12Z on August 2, 1989 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017).

According to Environment and Climate Change Canada (2018), an F1 tornado touched down at 10:00 am EDT near Parry Island, ON. The track and width of the tornado was not documented by ECCC. The tornado caused no injuries, fatalities or property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Sat Jul 30 1988. Retrieved from:

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