NECN 3/29/10: Residents of Wayland, Mass. keep close eye on Sudbury River. Bay State residents are bracing for days of heavy rain, flooding and the wettest March on record in some areas. [With video] The National Weather Service has posted flood warnings and advisories from Maine to the Carolinas. The storm is threatening to push some already-swollen rivers over their banks, including the Sudbury River in Wayland, Massachusetts. The rainiest March on record in Boston was 1953, when 11 inches fell during the month; nearly 10 inches had already fallen before the start of the latest storm.