Hurricane Harvey strengthens to Category 4 as it nears Texas

Luis Perez watches waves crash against a jetty in Galveston, Texas as Hurricane Harvey intensifies in the Gulf of Mexico Friday, Aug. 25, 2017. Harvey is forecast to be a major hurricane when it makes landfall along the middle Texas coastline. [Photo: AP/David J. Phillip]

Clouds and rain form over downtown Corpus Christi, Texas, as the outer bands of Hurricane Harvey move closer to shore, Friday, Aug. 25, 2017. The National Hurricane Center warns that conditions are deteriorating as Hurricane Harvey strengthens and slowly moves toward the Texas coast. [Photo: AP/Eric Gay]

Fishermen walk along a pier as the early bands of Hurricane Harvey make landfall, Friday, Aug. 25, 2017, in Corpus Christi, Texas. Harvey intensified into a hurricane Thursday and steered for the Texas coast with the potential for up to 3 feet of rain, 125 mph winds and 12-foot storm surges in what could be the fiercest hurricane to hit the United States in almost a dozen years.[Photo: AP/Eric Gay]

David Angirita walks along a jetty in Galveston, Texas as Hurricane Harvey intensifies in the Gulf of Mexico Friday, Aug. 25, 2017. Harvey is forecast to be a major hurricane when it makes landfall along the middle Texas coastline. [Photo: AP/David J. Phillip]