After a prolonged period of hot and humid weather across Southern Manitoba, a frontal wave pushing eastwards triggered numerous severe thunderstorms across southeastern Saskatchewan and southwestern Manitoba. None was worse than a thunderstorm that exploded over southwestern Manitoba and rapidly developed into a massive supercell thunderstorm. After a short while, this storm organized and produced its first tornado; this would end up being just one of numerous touchdowns over the course of the following 3 hours. The tornadoes this supercell thunderstorm produced were staggering in their intensity; perhaps most notably was the tornado it produced near Tilston, Manitoba whose size and power shocked even veteran storm chasers.