Remnant tropical moisture from what used to be Tropical Storm Mario is traveling up the West Coast, sending a large area of thunderstorms into the Desert Southwest on Thursday.

Much of interior Southern and Central California is under flood-related alerts, with flash flooding occurring in areas of locally heavy rain.

Even as the arm of storms shifts north, thunderstorms will continue to erupt Thursday evening due to clearer skies, ongoing warming, and abundant moisture left behind. These storms will be more localized, raising concern for flash flooding and gusty winds. Convection will diminish overnight.

Meanwhile, stormy activity is spreading into the Sierra and approaching Northern California, with the chance for showers to reach the San Joaquin Valley around dinnertime and the Sacram

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