JOHN YANG:

Across Puerto Rico today, more rain. In some spots, as much as three feet is forecast to fall by Friday. Flood warnings cover the entire island.

Parts of San Juan were under several feet of water after the storm surge rushed in. Residents emerged from an overnight curfew to face the first clear view of the devastation: clothes and belongings strewn about, trees and power lines downed, red tile roofs splayed across streets.