Harriston, ON F0 Tornado of September 7, 1997

Waterloo - Wellington

This tornado touched down around 7:30 pm, snapping and uprooting trees. Witnesses reported observing a funnel cloud with debris at its base.

Figure 1 depicts the surface observations at 8:00 pm, which depicts a low pressure with its associated cold front stretching into southern Ontario. This front became the focus for thunderstorms, which ultimately led to this tornado.

Figure 1. Surface analysis at 00Z on September 7, 1997 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017)

According to Environment and Climate Change Canada (2018), an F0 tornado touched down at 7:23 pm EDT near Harriston, 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 00Z Sun Sep 7 1997. 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/