(Portland, OR) -- The Coast Guard is warning mariners about the atmospheric river that will hit the Pacific Northwest this week bringing heavy rain, strong winds, and high seas. The Coast Guard urges coastal communities to stay alert to changing conditions. Mariners should check conditions, carry a working VHF radio and wear a life jacket if headed out on the water. The Oregon Coast and Willamette Valley is expected to see more than three inches of rain over 72 hours.