Highland Grove, ON F1 Tornado of July 4, 2001


The tornado caused considerable damage to forest near Highland Grove, west of Bancroft, in Central Ontario. Many trees were snapped and uprooted.

This was one of four tornadoes to touch down during a small tornado outbreak in Southern and Central Ontario. The others were an F0 near Ayr, an F0 at Campbellville, and an F1 near Fenelon Falls.

Figure 1 depicts the surface observations at 2:00 pm EDT, which shows a significant low pressure over James Bay with a cold front extending into Ontario and Michigan. This front became the focus for intense thunderstorms in the afternoon hours of July 4th, which ultimately led to this F1 tornado.

Figure 1. Surface analysis at 18Z on July 4, 2001 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017)

According to Environment and Climate Change Canada (2018), an F1 tornado touched down at 2:34 pm EDT near Highland Grove 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 18Z Wed Jul 4 2001. 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/