Mandaumin, ON F0 Tornado of June 30, 1990

Sarnia - Lambton

At 6:30 pm this tornado touched down, tearing the doors off of a house and a garage, and knocking down trees. Witnesses reported observing a funnel cloud with a debris swirl below.

Figure 1 depicts what it looked like a the surface at 5:00 pm EDT, showing a warm front ejecting into southern Ontario and a cold front moving across Michigan. This cold front was responsible for initiating afternoon storms and ultimately, this F0 tornado.

Figure 1. Surface analysis at 21Z on June 30, 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 F0 tornado touched down at 6:30 pm EDT near Mandaumin, 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 21Z Sat Jun 30 1990. Retrieved from:

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