Heavy rain and flash flooding swept the Pacific Northwest on Tuesday as an atmospheric river system also brought unseasonably warm temperatures to the region.

We are tracking a cross-country storm that could produce rain, snow, wind and severe weather in the coming days. Here's what to know.

Parts of the U.S. will see temperatures 20 or more degrees above average this week. But a cooldown will follow.

Here's the very latest on this developing situation.

Here's what to expect from the latest in a series of atmospheric river-fed storms hitting the Northwest.