What Is a Storm Surge? Matthew's Coastal Threat ExplainedIn some parts of Florida, sea levels could rise up to 11 feet at high tide due to Hurricane Matthew. TODAY’s Al Roker explains why.What is a storm surge? Al Roker explains coastal threat of Hurricane Matthew01:11Link copiedOct. 7, 2016, 12:03 PM UTC / Updated Oct. 7, 2016, 12:03 PM UTC