Flash flooding is possible for San Diego County in the coming hours as heavier rainfall reaches the area, according to a warning from the National Oceanic and Atmospheric Administration's Weather Prediction Center.

A flash flood warning remains in effect for Riverside County, southeastern Orange County and northwestern San Diego County for the next hour or so, with more flash flooding possible as the rainfall picks up. 

San Diego County may see 0.25 to 0.75 inches of rainfall per hour, with rainfall totals accumulating between 1 and 2 inches.

Moderate risk: A moderate risk for excessive rainfall, or a level 3 of 4, remains in effect for the couple of hours across Southern California before dropping to a slight risk for excessive rainfall, or a level 2 of 4, for the day on Tuesday. 

Flood watches have dropped across Northern California. And, the total population under flood watches across Central California, Southern California and parts of Arizona and Nevada is over 30 million people. 

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