Watch this giant supercell stalk through the sky as it begins to form the devastating tornado that ransacked Magnum, Oklahoma on May 21. <br /><br />The ominous dark clouds loom close to the ground as a funnel can clearly be seen forming at the edge of this monster system. <br /><br />The funnel became a violent twister which ripped through Magnum, Oklahoma causing severe damage to homes and structures according to the US' National Weather Service. <br /><br />The filmer is in a moving vehicle while capturing the enormous cloud formation set back in a field. <br /><br />Footage shows the daunting size of this supercell and how different shades of grey permeate the system yet deep within its centre the colour turns to night-black.
