Figure 1 depicts the surface observations at 12:00 pm MDT, which shows an occluding low pressure over Central Alberta, which ultimately resulted in a tornado outbreak across Alberta.
Three tornadoes occurred on this day:
According to Environment and Climate Change Canada (2018), an F0 tornado touched down at 12:30 pm MDT near Fort Assiniboine, AB. The path and width of the tornado was not documented by ECCC.
Sources
NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Wed Aug 2 1989. 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/