On May 31, 1985, one of the largest and most damaging tornado outbreaks occurred in the province of Ontario.
A string of storms spawned 13 tornadoes, six of which were rated F3 or greater on the Fujita Scale.
12 people were killed, hundreds of others were injured and damages from the storm topped $150 million.
"We lost three churches, 65 homes were damaged beyond repair," says Grand Valley resident Rick Taylor.
The city, which is about an hour north of Toronto, faced the storm head on. The tornado stayed on the ground for over 100 km as it tracked towards Tottenham and finally dissipated near Mount Albert.
Another twister touched down in Barrie, where eight people were killed and most of the city destroyed. The aftermath from that storm was described as a 'war zone.'
Captain Kevin Mason from C.F.B. Borden was on site to help with the search and clean up efforts.
"My particular function along with several other military police were to actually search the rubble and have a look for potential victims in any of the houses that were hit."
Mason described the impact from the storm as devastating.
"Immediately we knew we were into something very serious."
It was a day that came to be known as 'Black Friday.' Trees were uprooted, cars tossed and homes destroyed.
"There was total devastation, there was cars overturned, there was pieces of building laying in the middle of the street as far as the eye could see," says Barrie Fire Chief John Lynn, who was a new firefighter at the time.
Officials say this is why emergency preparedness has become a top priority in many Canadian cities. Watching and listening to severe weather forecasts can help to protect properties and it can also help to save lives.
"If we're predicting the chance of tornadoes, it's important to make sure your family is aware of that scenario and not to panic or change your routine, but to know that if a warning is issued by Environment Canada, you've got to change drastically what you're doing and take shelter immediately," says Chris Scott, a meteorologist at The Weather Network.