The National Weather Service is warning that up to 3 inches of rain could fall locally through Thursday and predicting wind gusts up to 40 mph.
Residents should gather rain gear and drive carefully as the wind and rain will make driving hazardous.
Rain, forecast at 100 percent, will fall steadily until Friday and then taper to showers with occasional heavy rain.
Flash flooding could also occur in low-lying areas.
Although the Chetco River was receding, Tuesday night the gauge at Second Bridge report it was flowing at 4,860 cubic feet per second (cfs), above the median of 3,120 cfs.
The river is expected to reach action stage, 18.5 feet, this afternoon.
Rough seas will build Tuesday night and peak again Thursday with waves up to 7 feet and swells up to 14 feet.
In preparation for the storm, the city of Brookings is making sandbags available for home and business protection in flood-prone areas within the city.