Estaire, ON F0 Tornado of July 7, 2009

Greater Sudbury and Vicinity

No damage was caused by this tornado. Witnesses photographed a funnel cloud extending to the ground but with its base obscured by trees. Figure 1 depicts the surface observations at 2:00 pm EDT, which shows an occluding low pressure system in central Ontario. This low pressure caused enough convergence and vertical motion to initiate thunderstorms around the Sudbury area, which ultimately led to this weak tornado.

Figure 1. Surface analysis at 18Z on July 7, 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 4:00 pm near Estaire, ON. The path and width of the tornado was not documented by ECCC. The tornado caused no fatalities, injuries or property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Tue Jul 7 2009. Retrieved from:

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