Figure 1 depicts the surface observations at 1:00 pm CDT, which shows a low pressure system in northern Saskatchewan with a cold front extending east across northern Manitoba and a cold front extending south across southern Saskatchewan and Montana. The cold front in northern Manitoba became the focus for thunderstorms, which ultimately led to this tornado.
According to Environment and Climate Change Canada (2018), an F0 tornado touched down at 3:08 pm CDT near Poplar River, MB. The path and width of the tornado was not documented by ECCC. The tornado caused no fatalities, injuries or property damage.
Sources
NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Sat Aug 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/