Ida made its way up the country and crashed into the New York and New Jersey areas Wednesday night.
The governors of New York and New Jersey each declared states of emergency. New York City Mayor Bill de Blasio called it a "historic weather event". At least nine people have died and the New York Subway system was completely shut down.
The MTA subway service is slowly coming back, beginning with the lettered lines after the historic flooding.
"This has been a historic and challenging night for the region, our customers, and transit workers," said Janno Lieber, acting MTA Chair and CEO.
Videos posted all over social media show water engulfing subway stations, people's homes and taking over roads.