The National Weather Service’s Portland office issued a flood watch to be in effect from 4 a.m. Monday until 4 a.m. Friday for portions of west-central Oregon, including Benton County.
A prolonged atmospheric river is expected to bring periods of heavy rain to northwest Oregon Monday through Wednesday, with periods of lighter rain continuing Thursday into Friday.
Rivers draining the coastal mountains and several Willamette tributaries have the highest chance of flooding at 40% to 80%. Chances for flooding along the Willamette mainstem remain low at less than 10%…