Churning out from an ominous gray storm cloud, a tornado emerges on an Oklahoma plain.<br/> <br />Stormchasers recording the massive twister touching down hear cows mooing as if to sound a warning.<br/> <br />(SOUNDBITE) (English) STORM CHASER OFF CAMERA SAYING:<br/> <br />"This is attempting to become a large condensed tornado, and now I hear cows."<br/> <br />Another storm chaser video shows two tornadoes forming simultaneously...also in Oklahoma.<br/> <br />Dozens of tornadoes tore through parts of Oklahoma, Kansas, Nebraska and Iowa overnight and one twister killed at least five people on Sunday.<br/> <br />Twisters are already blamed for 62 deaths in 2012 in the Midwest and South, raising concerns that this year could be a repeat of 2011, the deadliest tornado year in nearly a century, when some 550 people were killed by tornadoes.<br/> <br />Katharine Jackson, Reuters.
