Guelph, ON F0 Tornado of April 25, 2009

Waterloo - Wellington

This tornado struck at 4:30 pm and had a path that was 1.4 km long and 50m wide. Trees were knocked onto houses and some homes sustained minor roof damage.

This was one of five tornadoes that touched down across the province on April 25; the others were an F0 at Round Lake Centre, an F1 at Breslau, an F0 at Windsor, and an F0 at Ottawa.

Figure 1 depicts the surface observations at 2:00 pm EDT, which shows a cold front over the Great Lakes and Michigan. This front became the focus of intense thunderstorms through the afternoon/evening hours of April 25th, which ultimately led to several tornadoes across southern Ontario.

Figure 1. Surface analysis at 18Z on April 25, 2009 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 4:30 pm near Guelph, ON. The tornado travelled for 1.4 km and had a maximum width of 50 metres. The tornado caused no fatalities or injuries, but caused $10 thousand dollars in property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Sat Apr 25 2009. Retrieved from:

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