Tropical Storm Hilary made landfall on Mexico's Baja peninsula and moved into Southern California with damaging wind and heavy rainfall on Sunday, Aug. 20, 2023. Forecasters warned of a 'potentially historic amount of rainfall' and dangerous flooding. California's governor declared a state of emergency on Saturday, and officials had urged people on Catalina Island and in other high-risk areas to evacuate. Nevada's governor declared a state of emergency on Sunday.
. In California, that can mean flash flooding from extreme rainfall enhanced by mountains.
When a tropical storm plows up on a mountain, that can lead to more lifting, more condensation aloft and more rainfall than might otherwise be expected. It happened with in 2018 and can also happen in other tropical cyclone-prone locations with significant orographic, or mountain, effects, such as the west coast of Mexico.
That can mean dangerous flash flooding from the runoff. It can also have a secondary hazard—mudslides,In dry areas, heavy downpours can also trigger flash flooding. Forecasts showed Death Valley likely to get
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