'Polar vortex' to blame for U.S. freeze

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CNN meteorologist Chad Myers explains how a "polar vortex" is causing record low temperatures in the U.S.http://feeds.feedburner.com/~ff/rss/cnn_us?d=yIl2AUoC8zA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=0G4ITKGwgT0:9I2Fv5vMb1E:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/rss/cnn_us?d=7Q72WNTAKBA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=0G4ITKGwgT0:9I2Fv5vMb1E:7Q72WNTAKBA) http://feeds.feedburner.com/~ff/rss/cnn_us?i=0G4ITKGwgT0:9I2Fv5vMb1E:V_sGLiPBpWU</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=0G4ITKGwgT0:9I2Fv5vMb1E:V_sGLiPBpWU) http://feeds.feedburner.com/~ff/rss/cnn_us?d=qj6IDK7rITs</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=0G4ITKGwgT0:9I2Fv5vMb1E:qj6IDK7rITs) http://feeds.feedburner.com/~ff/rss/cnn_us?i=0G4ITKGwgT0:9I2Fv5vMb1E:gIN9vFwOqvQ</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=0G4ITKGwgT0:9I2Fv5vMb1E:gIN9vFwOqvQ)
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