A pair of back-to-back storms were forecast to dump heavy snow and rain over parts of the Pacific Northwest, northern California and the Rockies this week, triggering winter storm and flood warnings.

A strong atmospheric river storm is headed for Northern California this week, bringing heavy rain, mountain snow, high winds and the potential for flooding.

Meteorologists say storm amounts of rainfall could reach 21 inches in parts of California, causing serious risk of flooding.

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The first atmospheric river of the season will dump a deluge of rain on Northern California this week — but San Luis Obispo County will dodge most of the damage. An atmospheric river is a long, narrow band of water vapor in the atmosphere that releases a large amount of rain and snow,

LOS ANGELES - More than a foot of rain, along with potential hurricane-force winds, via the "bomb cyclone" is coming for the West Coast this week. Fox 11 Chief Meteorologist Adam Krueger says the warning map is "lit up" from Northern California to Oregon and Washington.