Laura gains strength, could bring 'unsurvivable' storm surge

Laura strengthened Wednesday into a menacing Category 4 hurricane, raising fears of a 20-foot storm surge that forecasters said would be "unsurvivable” and capable of sinking entire communities. Authorities implored coastal residents of Texas and Louisiana to evacuate and worried that not enough had fled. The storm grew nearly 87% in power in just 24 hours to a size the National Hurricane Center called “extremely dangerous.”