Big Trout Lake, ON F0 of July 4, 1989

Big Trout Lake - Sachigo Lake

Multiple witnesses reported observing this tornado touch down briefly, snapping and uprooting trees. Figure 1 depicts a cold front moving through the area at 10:00 pm CDT, which triggered thunderstorms and ultimately, this tornado.

Figure 1. Surface analysis at 03Z on July 4, 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 F0 tornado touched down at 11:10 pm CDT near Wingham, 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 03Z Wed Jul 5 1989. Retrieved from:

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