Windsor, ON F0 Tornado of July 31, 1999

Windsor - Essex - Chatham-Kent

No damage was caused but witnesses observed this probable tornado touching down at 3:45 pm; they described it as being a whirl of dust and debris.

Figure 1 depicts the surface observations at 2:00 pm, which shows a low pressure system in northern Ontario with a warm front extending into northern Quebec and a cold front extending into the Great Lakes. Figure 1 also depicts a line of thunderstorms ongoing in southwestern Ontario. This line of thunderstorms was ultimately responsible for this F0 tornado.

Figure 1. Surface analysis at 18Z on July 31, 1999 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 3:42 pm EDT near Windsor, 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 Sat Jul 31 1999. Retrieved from:

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