Following the devastating Indian Ocean tsunami in late 2004 , the WC/ATWC expanded its scope to the U.S. Atlantic coast , and the Atlantic coast of Canada . On 1 October 2013 , the name was changed to the National Tsunami Warning Center ( NTWC ) to reflect this expanded geographical zone of responsibility
Indian Ocean tsunami in late 2004
2004 Indian Ocean earthquake and tsunami
National Tsunami Warning Center