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 intense thunderstorms in the afternoon and evening hours of July 31st, which ultimately led to a tornado outbreak.
Eight tornadoes occurred on this day, the other tornadoes were:
- Beaumont, AB F2 Tornado
- Leduc, AB F0 Tornado
- Iddesleigh, AB F0 Tornado
- Blue Ridge, AB F0 Tornado
- Millet, AB F2 Tornado
- Island Lake, AB F0 Tornado
- Edmonton, AB F4 Tornado
According to Environment and Climate Change Canada (2018), an F1 tornado touched down at 3:25 pm MDT in Edmonton, AB. The path and width of the tornado was not documented by ECCC.
NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Fri Jul 31 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/