Figure 1 depicts the surface observations at 7:00 pm CDT, which shows a high pressure system over northern Manitoba and a low pressure system across Alberta with a warm front extending southeast across Saskatchewan and a stationary front in extreme southeastern Saskatchewan. The stationary front help trigger thunderstorms across extreme southwestern Manitoba, which ultimately led to this tornado.
According to Environment and Climate Change Canada (2018), an F0 tornado touched down at 7:10 pm CDT near Lena, 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 00Z Thu Aug 23 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/