Witnesses reported seeing a funnel cloud in the Winthrop area at around 6:20 pm. Over its 2 kilometre-long path, the tornado caused damage to trees, knocked over a silo and destroyed two old barns, tossing debris up to 500 metres away. This was one of two tornadoes that occurred on May 15; the other was a an F1 at Kuhryville.
Figure 1 depicts the surface observations at 2:00 pm EDT, which shows a cold front slicing through southern Ontario, where a moist and unstable atmosphere is present. This cold front initiated thunderstorms in the afternoon hours of May 15th, which ultimately led to two F1 tornadoes.
![](https://highwaysandhailstones.com/wp-content/uploads/2019/11/Untitled-93.png)
According to Environment and Climate Change Canada (2018), an F1 tornado touched down at 6:20 pm near Winthrop, ON. The tornado travelled for 19.9 km, but its width was not documented by ECCC. The tornado caused no fatalities or injuries, but caused $100 thousand dollars in property damage.
Sources
NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Tue May 15 2007. Retrieved from: https://www.wpc.ncep.noaa.gov/archives/web_pages/sfc/sfc_archive.php
Environment and Climate Change Canada Data. (2018). Canadian National Tornado Database: Verified Events (1980-2009) – Public. Retrieved from: http://donnees.ec.gc.ca/data/weather/products/canadian-national-tornado-database-verified-events-1980-2009-public/