Figure 1 depicts the surface observations at 12:00 pm MDT, which shows a cold front moving across Alberta. This front became the focus for thunderstorms, which ultimately resulted in four tornadoes.
The other tornadoes that occurred on this day were:
According to Environment and Climate Change Canada (2018), an F1 tornado touched down at 7:30 pm MDT 15 km north of Irma, AB and travelled for 8 km.
NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Tue Jun 28 1988. 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/