The National Weather Service is reassuring people after a tsunami warning alert was mistakenly issued from the Gulf Coast to the East Coast. The warning went out on some weather apps just before 8:30 a.m. Eastern, and was reported in areas from New Orleans and Houston to Palm Beach, Florida to Maine. The alert said a tsunami warning was in effect. About 20 minutes later, Accuweather tweeted that the push notification was just a test. The National Weather Service is also tweeting, saying there never was a threat of a tsunami.