A major cross-country storm next week threatens to cause travel delays for millions across the United States during the busy Thanksgiving holiday.

Southern California is set to be the first hit, with heavy rainfall throughout Friday. Up to 1 inch of rain per hour is possible, with 1 to 2 inches of total rainfall in urban areas causing localized flash flooding. Rock- and mudslides are also possible.

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The storm will shift away from California on Saturday and move into the desert, where heavy rainfall is forecast to sweep across southern Arizona. It is then expected to move into the Southern Plains, where it poses the risk of excessive rainfall in areas that were just hit by a separate system over the past two days.

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