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NASA's Terra satellite shows snow in SoCal's mountains. Melissa Magee reports for the NBC4 News.The storm will have more severe implications for Northern California, where heavy rain, strong winds, thunderstorms and the threat of flooding are possible in communities already hammered by earlier storms.
The flood threat will come from the combination of rain and melting of parts of the huge snowpack built in California's mountains by nine atmospheric rivers early in the winter and later storms fueled by a blast of arctic air. The snowpack at high elevations is so massive it should be able absorb the rain, forecasters said. But elevations below 4,000 feet will see melting and runoff. At high elevations the storm was predicted to dump heavy snow, as much as 8 feet in some locations.
California's Sierra Nevada snowpack, which provides about a third of the state's water supply, is more than 180% of the average on April 1, when it is historically at its peak. Ideally, the snowpack melts in spring and summer, then runs off into the state's expansive water supply system. So much snow has fallen in the Sierra and other mountain ranges that residents are still struggling to dig out days after earlier storms. Roofs collapsed, cars were buried and roads were blocked. Gov. Gavin Newsom declared emergencies in 13 of California’s 58 counties beginning March 1.
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