Marion, Ohio – The National Weather Service out of Cleveland has issued a Flood Advisory for Marion County, and parts of Morrow and Wyandot Counties. Flood Advisory for Minor Flooding in Poor Drainage Areas. At 816 AM EDT, Doppler radar indicated rainfall over an inch along the U.S. 30 corridor from west of Mansfield eastward to Canton. A large rain shield will continue through the morning hours. This will cause minor flooding, primarily in low lying and poor drainage areas in the advisory area until 2:15 PM.