It's been so bad in some places that comparisons are being made to the flooding from
Hurricane Agnes in 1972, and of pages from out of the book of Katrina (2005).
From Weather.com
"Major flooding continues to occur in the Northeast this evening as three days of heavy rain have inundated rivers from New York to Virginia. Hundreds of thousands have been evacuated, roads are washed out, and many homes are flooded. Rivers in New York, Pennsylvania, and New Jersey -- including the Susquehanna, Schuylkill, and Delaware - are expected to crest during the day on Thursday. Some rivers will not drop below flood stage until Saturday. Meanwhile, another storm system rolling in from the Ohio Valley will bring more rain to the region on Thursday. The good news is that these storms will be more scattered in nature, so not everywhere will see a soaking. Unfortunately, some pockets of heavy rain are possible, especially across eastern Pennsylvania and New Jersey. Even parts of New England can expect some showers and storms on Thursday."
TWC Video On Demand on the Northeast Flooding