The worst of the rain, snow, and winds carried by the so-called Pineapple Express, a river of warm air loaded with moisture, will hit California on Thursday and stick around at least through Friday, forecasters said. The weather system, headed east from near Hawaii, is the wettest storm on the U.S. West Coast this season. It has swamped cars, flooded vineyards and forced hundreds of Californians to evacuate their homes Wednesday to escape the threat of mudslides. Three Delta Air Lines passengers suffered minor injuries when severe turbulence shook a flight headed from southern California to Seattle on Wednesday, according to authorities.