Wenasaga Lake, ON F1 Tornado of August 16, 2011

Red Lake - Ear Falls

About 100 km north of Dryden and just to the north of Ear Falls, near Wenasaga Lake, this F1 tornado snapped and uprooted trees in a path that was a kilometre long and 300m wide. This was one of four tornadoes that touched down on August 16, 2011.

Figure 1. Surface analysis at 21Z on August 16, 2011 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017).

Figure 1 depicts the surface observations at 4:00 pm EDT, which shows an occluding low pressure in northern Manitoba, bringing a cold front near the ON/MB border and a warm front in northwestern Ontario. The warm front became the focus for intense thunderstorms throughout the afternoon and evening hours, which ultimately led to four tornadoes across northwestern Ontario on this day.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 21Z Tue Aug 16 2011. Retrieved from: https://www.wpc.ncep.noaa.gov/archives/web_pages/sfc/sfc_archive.php