Watch Cnn coverage on "Tornado threat closes in on Northeast, Bad weather threatens 33 million" Across the United States, 33 million people could face severe weather on Sunday. The greatest potential for storms will be in parts of Oklahoma and Texas.
At Least One Dead, Three Injured in Texas After Tornado Slams Community. A tornado is a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. They are often referred to as twisters or cyclones, although the word cyclone is used in meteorology, in a wider sense, to name any closed low pressure circulation.
