Only partial framing remains of houses in a residential community along the Jourdan River, north of Bay St. Louis, Miss., after being devastated by Hurricane Katrina on Thursday, Sept. 8, 2005. (AP Photo/M. Spencer Green)
People launch boats from an overpass into floodwaters in the aftermath of Tropical Storm Harvey in Kountze, Texas, Thursday, Aug. 31, 2017. (AP Photo/Gerald Herbert)
People sit on both sides of a destroyed bridge that crossed over the San Lorenzo de Morovis river, in the aftermath of Hurricane Maria, in Morovis, Puerto Rico, Wednesday, Sept. 27, 2017. A week since the passing of Maria many are still waiting for help from anyone from the federal or Puerto Rican government. But the scope of the devastation is so broad, and the relief effort so concentrated in San Juan, that many people from outside the capital say they have received little to no help. (AP Photo/Gerald Herbert)
The sun rises in Seaside Heights, N.J., Monday, Feb. 25, 2013, behind the Jet Star Roller Coaster which has been sitting in the ocean after part of the Funtown Pier was destroyed during Superstorm Sandy. The private owners of the amusement pier that collapsed in Seaside Heightsare working with insurers to devise a plan to dismantle the ride and get it out of the ocean. (AP Photo/Mel Evans)
A resident in Homestead, Fla., asks for help for the entire block, Aug. 26, 1992, after the area was ravaged by Hurricane Andrew earlier in the week. The sign on the roof reads "Help please! The block needs H20, can food, ice, gas, building supplies." Homestead was one of the hardest hit areas in the wake of the storm. (AP Photo/Lynne Sladky)
FILE - In this file photo taken Sept. 12, 2008, a boarded up home sits along the beach as Hurricane Ike approaches Galveston, Texas. (AP Photo/David J. Phillip, File)
An SUV is seen covered by sand as residents walk to their homes to inspect the damage by hurricane Ivan Wednesday, Sept. 22, 2004 in Pensacola Beach, Fla. Beach residents were allowed to see their homes for the first time since the hurricane. (AP Photo/Alan Diaz)
ALAN DIAZ
9. Hurricane Wilma, 2005
Total cost of damages: $25.8 billion
Storm category: 3
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Residents look over damage caused by Hurricane Wilma to the Sugarland Mobile Home Park in Clewiston, Fla., Monday, Oct. 24, 2005. Hurricane Wilma left a wide, messy swath of damage Monday as it sped across Florida with winds of more than 100 mph, shattering skyscraper windows, peeling off roofs and knocking out power to more than 6 million people from Key West to Daytona Beach. (AP Photo/Luis Alvarez)
FILE - In this Oct. 12, 2018, file photo, debris from Hurricane Michael is scattered over Mexico Beach, Fla. Hurricane Michael's impact is one the top stories in Florida in 2018. (AP Photo/Gerald Herbert, File)
Two dangerous storms are swirling toward the U.S. with fluctuating intensity. Officials feared a history-making onslaught of life-threatening winds and flooding stretching from Texas to Alabama.
Gulf Coast residents fled inland Wednesday as hurricane forecasters warned of an "unsurvivable” 20-foot storm surge capable of sinking entire communities. Get the latest updates and learn more about catastrophic storms.