Watch: How the Oklahoma Tornado Was FormedBBC weather presenter Ben Rich explains the formation of twisters
Dozens of people are feared dead and more than 140 injured after a huge tornado tore through Oklahoma City suburbs on Monday. BBC weather presenter Ben Rich explains how the tornado was formed. The formation occurs as warm air from the Gulf wafts north and is met by cold air from the Northwest. These colliding air masses cause strong thunderstorms and winds which can blow at different levels in the atmosphere, as well as blow in different directions, causing the storms to spin and ultimately form a tornado. According to Rich, there typically isn't much warning as to where a twister will hit until it forms.
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