Figure 1 depicts the surface observations at 12:00 pm MDT, which shows a stationary front across Northern Alberta. This front became the focus for thunderstorms across Central Alberta, which ultimately led to five tornadoes on this day.
The other tornadoes were:
According to Environment and Climate Change Canada (2018), an F1 tornado touched down near Nisku, AB. The path and width of the tornado was not documented by ECCC.
NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Thu Jul 30 1987. 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/