Harrow, ON F1 Tornado of June 25, 2009

Windsor - Essex - Chatham-Kent

A barn was torn apart and pieces deposited 500m away, trees were knocked down and crops damaged by this probable tornado. It touched down at 5:00pm and travelled for 1km.

This was one of four tornadoes to touch down in Southern Ontario on June 25; the others:

Figure 1 depicts the surface observations at 2:00 pm EDT, which shows a cold front slicing through southern Ontario. This front became the focus for intense thunderstorms in the early afternoon hours of June 25th, which ultimately led to several tornadoes across Ontario.

Figure 1. Surface analysis at 18Z on June 25, 2009 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 5:00 pm near Harrow, ON. The tornado travelled for 1 km and had a maximum width of 275 metres. The tornado caused no fatalities, injuries or property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Thu Jun 25 2009. 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/