Figure 1 depicts the surface observations at 5:00 pm EDT, which depicts a cold front extending across central/southern Ontario and over the Great Lakes. This front became the focus for thunderstorms in the late afternoon and ultimately led to the simultaneous tornadoes at Sand Lake and South Tea Lake near Algonquin Provincial Park.
According to Environment and Climate Change Canada (2018), an F0 tornado touched down at 4:30 pm EDT near Sand Lake, ON. The width of the tornado was 20 metres, but the track was not documented by ECCC. The tornado caused no fatalities, injuries or property damage.
NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 21Z Thu Jul 21 1994. 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/