More than 6.5 million homes along the U.S. Atlantic and Gulf coasts are at risk of storm surge inundation, representing nearly $1.5 trillion in total potential reconstruction costs. More than $986 billion of that risk is concentrated within 15 major metro areas, according to a report by property data and analytics firm CoreLogic. Many at-risk homes lack protection from insurance coverage, the company warned. The analysis examined homes along the coastlines of 19 states and the District of Columbia in the Gulf and Atlantic regions, extending as far west as Texas and as far north as Maine.