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.

If you live in the Pacific Northwest, don’t expect a break from the rain anytime soon. An atmospheric river is going to continue to pump moisture into the region, resulting in heavy rain and possible flooding.