An active pattern kicks into high gear this week in the Pacific Northwest as a parade of atmospheric rivers could drop up to a foot of rain for coastal areas and several feet of snow at higher elevations.

The FOX Forecast Center is tracking a busy head start to the rainy season bringing with it flooding potential with rounds of atmospheric rivers set to arrive back-to-back in the coming week.

Atmospheric rivers are rainstorms along the West Coast fueled by moisture, typically with tropical origins, carried by the jet stream. These storms are sometimes compared to a river of water vapor in the sky. When an atmospheric river comes ashore, it brings moderate-to-heavy rainfall for two days or more.

The graphic below shows these "waves" of moisture arriving along the West Coast beginning Tue

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