Marsville, ON EF1 Wedge Tornado of August 2, 2015

Dufferin - Innisfil

Following the powerful EF2 tornado that hit the village of Teviotdale, the parent storm tracked eastward and produced this second tornado near Marsville. The touchdown occurred east of town, near the intersection of County Road 3 and County Road 25, at around 9:30 pm. Its path was 2 km long and 500m wide, along which several properties were damaged.

The tornado moved through several farms and produced considerable EF1 damage. Trees were snapped and uprooted, many of which crashed down onto homes and vehicles. The top of one tree was thrown into a swimming pool. In addition, crops were levelled, barns were also damaged and at least one well-built shed was destroyed.

This was one of four tornadoes that touched down on August 2, 2015. The others:

Figure 1. Surface analysis at 03Z on August 3, 2015 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017)

Figure 1 depicts the surface observations at 11:00 pm EDT, which shows a squall line (line of thunderstorms) moving across southern Ontario and Lake Ontario. This line of storms was responsible for several strong tornadoes across southern Ontario in the late-evening hours of August 2nd.

Figure 2. Doppler radar reflectivity at 10:43 pm EDT (source:

Figure 2 shows the squall line moving across the GTA in southern Ontario.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 03Z Mon Aug 3 2015. Retrieved from: