A barn received minor damage to its roof and about a dozen mature trees were snapped or uprooted by this EF0 tornado which touched down near Elmvale. It was brief, hitting at around 1:30 pm with a path length of just over 500m and a width of 50m. This was one of five tornadoes that touched down on May 21, 2013. The others:
Figure 1 depicts the surface observations at 11:00 am EDT, which shows a stationary front across southern Ontario with a low pressure over Midland. This front became the focus for intense thunderstorms, which led to three tornadoes across southern Ontario on this day.
NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 15Z Tue May 21 2013. Retrieved from: https://www.wpc.ncep.noaa.gov/archives/web_pages/sfc/sfc_archive.php