Primrose, ON F0 Tornado of May 1, 1996

Dufferin - Innisfil

Touching down at 3:00 pm, this tornado partially unroofed a barn, scattering boards and sheet metal through nearby fields. It then struck the Dufferin County Roads building, tearing shingles off of the roof and damaging cars with flying debris.

Figure 1 depicts a strong low pressure occluding over Hudson Bay. This low pressure is extending a trough of low pressure into southern Ontario. This area of convergence played a role in triggering thunderstorms in the early afternoon of May 1st.

Figure 1. Surface analysis at 18Z on May 1, 1996 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 3:00 pm EDT near Primrose, ON. The tornado travelled for 500 metres and had a maximum width of 270 metres. The tornado caused no fatalities, injuries or property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Wed May 1 1996. Retrieved from:

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