Grande Cache, AB F1 Tornado of July 29, 1987

Figure 1 depicts the surface observations at 12:00 pm MDT.

**Figure 1.** Surface analysis at 18Z on July 29, 1987 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017)

According to Environment and Climate Change Canada (2018), an F1 tornado touched down near Grande Cache, AB. The tornado travelled for 5.64 km with a maximum width of 310 metres.

Sources

NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Wed Jul 29 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/

Sources

Through the Eyes of Our Chasers