Figure 1 shows the surface observations at 4:00 pm CDT, which shows an occluding low pressure over northern Manitoba with a stationary front extending south across Manitoba and a warm front extending east across northern Ontario. The stationary front became the focus for intense thunderstorms across south-central Manitoba, which ultimately led to two tornadoes on this day.
According to Environment and Climate Change Canada (2018), an F0 tornado touched down at 5:00 pm CDT near Siglunes, MB. The track 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 21Z Wed Aug 11 1993. 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/