The National Tsunami Warning Center (NTWC) is one of two tsunami warning centers that are operated by NOAA in the United States. It was called the West Coast and Alaska Tsunami Warning Center (WC/ATWC) until October 1, 2013. The name was changed to reflect its geographical zone of responsibility. Headquartered in Palmer, Alaska, the NTWC is part of an international tsunami warning system (TWS) program and serves as the operational center for TWS of all coastal regions of Canada and the United States, except Hawaii, the Caribbean, and the Gulf of Mexico. The other tsunami warning center is the Pacific Tsunami Warning Center (PTWC) in Ewa Beach, Hawaii, serving participating members and other nations in the Pacific Ocean area of responsibility. - Source: Wikipedia
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