The atmospheric river draped over the Pacific Northwest is sending its heaviest rainfall nearly directly over northwest Oregon and southwest Washington on Thursday and has dumped 1.50 inches of rain along the north Oregon Coast Range overnight, according to the National Weather Service.
The weather service says Portland has had more than a half inch of rainfall overnight and areas south of about Salem have seen less than a half inch.
The Willamette Valley’s mainstem rivers have a low probability of flooding, but some rivers in the Coast Range and on the coast have already reached minor-to-major flood stage. The Grays River near Rosburg, Wash entered minor flood stage as of early Thursday and will stay there through the day. The flood watch notes the Wilson River near Tillamook (a frequent flooder), the Trask River on the coast, and lowland zones in Tillamook County are at risk of flooding…