Torrential rains in New York and New Jersey on Monday night brought flash flooding that killed two people and led New Jersey Governor Phil Murphy to declare a state of emergency.
Officials had to perform rescues after flooding left drivers stranded as their vehicles rose in the waters.
In Plainfield, New Jersey, two people died when a car was swept away by floodwaters as the storm hit, Governor Murphy said on Tuesday.
Additional storms are expected on Tuesday with the potential for more flooding in the north-east as well as Florida and the mid-western US, according to the National Weather Service (NWS).