Figure 1 depicts the surface observations at 7:00 am EST, which shows an area of low pressure and a cold front in Northern Alberta. This front was likely responsible for triggering thunderstorms across Alberta in the afternoon hours of July 13th, which ultimately resulted in this tornado.
According to Environment and Climate Change Canada (2018), an F1 tornado touched down at 4:40 pm MDT in the City of Edmonton, AB. The path and width of the tornado was not documented by ECCC. No property damage was documented for this tornado.
NOAA Central Library. (2019). U.S. Daily Weather Maps. Monday July 13, 1981 [PDF]. Retrieved from https://library.noaa.gov/Collections/Digital-Collections/US-Daily-Weather-Maps
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/