Mariapolis to Somerset, MB F1 Tornado of July 3, 1986

Killarney - Pilot Mound - Manitou

Figure 1 shows the surface observations at 7:00 pm CDT, which shows a cold front moving through Manitoba. This cold front became the focus for intense thunderstorms in the late afternoon and evening hours of July 3rd, which ultimately led to this tornado.

Figure 1. Surface analysis at 00Z on July 4, 1986 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 at 9:33 pm CDT near Mariapolis, MB. The track and width of the tornado was not documented by ECCC. The tornado caused no fatalities, injuries or property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 00Z Fri Jul 4 1986. Retrieved from:

Environment and Climate Change Canada Data. (2018). Canadian National Tornado Database: Verified Events (1980-2009) – Public. Retrieved from: