This tornado touched down at 7:00 am as a line of thunderstorms with damaging winds tracked across Southern Ontario. At one area farm, a tree was snapped off at its base and thrown several metres into a nearby field.
The tornado was reported by a local storm chaser who observed a funnel cloud with a whirl of debris on the ground.
Figure 1 depicts the surface observations in the early morning hours of May 31st, which shows a strong low pressure in Wisconsin with a warm front extending into the Great Lakes and extreme southwestern Ontario. This front became the focus for thunderstorm development in the morning and ultimately this tornado.
According to Environment and Climate Change Canada (2018), an F0 tornado touched down at 7:00 am EDT near Caledon East, 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 06Z Sun May 31 1998. 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/