Satellite images show the path of powerful storm systems that moved through south-central United States between May 19 and May 20, 2013.
Canadians advised to prepare for tornadoes despite lower risk than U.S.
Severe thunderstorm watches and warnings issued in parts of southern Ontario
Crews wrap up search for Oklahoma tornado survivors
To see nature's wildest outbursts from a unique perspective, watch Angry Planet on The Weather Network tonight at 7pm & 10pm.
If you are outdoors in a vehicle and a tornado is approaching do not attempt to outrun the tornado. Also, resist the temptation to stay in your vehicle, it is much safer to exit your vehicle and head to a low lying area like a ditch or depression, lay flat and cover your head.
Storm on the horizon.
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