Satellite footage shows the moment Tropical Storm Hilary moved into the southwest of the United States on Sunday, 20 August. The storm was previously classed as a Category 4 hurricane but weakened as it hit Mexico. “Life-threatening” floods have hammered California after Hilary - the first tropical storm to hit the state since 1997 - made its way up the West Coast. Officials have warned Los Angeles and San Diego to shelter away from the flooding in a tropical storm warning.