Dalston, ON EF0 Tornado of May 21, 2013

Barrie - Orilla - Midland

Large rain-wrapped tornado skirts Dalston, causes minor tree and property damage

At about 2:00 pm, half an hour after the tornado at Elmvale, this EF0 tornado touched down near Dalston, north of Barrie. It travelled for 4.5 km with width of 500m, uprooting or snapping dozens of trees and damaging the cap of a silo. Eyewitness video of the tornado showed a dark, wide tornado, bowl-shaped and wrapped in rain. This was one of three tornadoes that touched down on May 21, 2013. The others:

Figure 1. Surface analysis at 15Z on May 21 2013 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017)

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