Monday started wet in parts of northwest Oregon and western Washington, and things were only expected to get wetter .

A strong atmospheric river is expected to bring inches of rain to the area between Monday and Wednesday and much of the region is under a flood watch .

An atmospheric river is essentially band of water vapor moving through the sky.

Unlike some atmospheric rivers earlier this fall , December’s event is expected to lead to some flooding, as it comes after several days of rain.

A map from the National Weather Service shows which parts of the region could see four or more inches of rain over the next several days.

The 72-hour probability to exceed 4 inches of rainfall through Thursday, Dec. 11, 2025, in Oregon and Washington. Courtesy of NOAA

Some areas could see

See Full Page