Main finding:

Exceptional January–September total precipitation contributed to flooding across the mid-Atlantic United States (Pennsylvania, New Jersey, Maryland, Washington, D.C., Delaware, and West Virginia) from May to September 2018, and was made 1.1 to 2.3 times more likely by anthropogenic climate change.

Full report:

EEE 2018 = Explaining Extreme Events of 2018 from a Climate Perspective