Goose Lake, ON F1 Tornado of July 4, 2003

Figure 1 depicts the surface observations at 1:00 pm CDT, which shows a low pressure system on the Manitoba/Ontario border with a trough extending into northwestern Ontario. This trough became the focus for thunderstorm development in the early afternoon of July 4th, which ultimately led to this F1 tornado.

**Figure 1.** Surface analysis at 18Z on July 4, 2003 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 2:15 pm CDT near Goose Lake, ON. The tornado travelled for 16.2 km with a maximum width of 490 metres. The tornado caused no fatalities, injuries or property damage.

Sources

NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Fri Jul 4 2003. 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/

Sources

Through the Eyes of Our Chasers