A significant amount of rain fell in the North Bay during the second push of an atmospheric river across Northern California on Wednesday, bringing with it the threat of thunderstorms. A severe thunderstorm warning from the National Weather Service accompanied the rain in southern Marin County,

The heaviest Bay Area storm system in a string of three of them is forecast to bring with it Tuesday everything that might be expected in the dead of winter. Clouds will look even darker and thicker. Winds will whip with ever-increasing speed. Flood waters likely will rise. Rain should pelt much of the Bay Area region.

The atmospheric river that soaked the Bay Area will deliver some more rain on Sunday, but flooding concerns remain only for part of the region, the National Weather Service said.