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.
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/