Temperatures are expected to plunge to just 5 degrees, forecasters said.
Heavy rain is expected to give way to snow Wednesday night, dumping 1 to 3 inches on the city.
The city could get up to an inch of snow by early Friday morning, according to weather experts.
A flash flood warning is in effect until 6 a.m. Wednesday, the National Weather Service said.
The city could see up to 3 inches of rain over next 48 hours, forecasters predict.
Bad weather put a damper on some July 4th activities, though skies were expected to clear by nighttime.
A flash flood watch is in effect across the city from 8 a.m. Thursday until noon Friday.
Heavy rain is expected into the early afternoon, but should give way to clear skies by nighttime.
Nearly 2 inches of rain were expected by noon Monday.
The city could get up to 1.5 inches of rain by early Saturday, the National Weather Service said.
The downpour drenched New York City with more than 5 inches of water, meteorologists said.
Some light showers are expected Tuesday, with the worst of the rain beginning Wednesday afternoon.
Flurries are expected to start falling around 7 p.m. Tuesday, the National Weather Service said.
After balmy temperatures, Thursday is not expected to top 26 degrees.
A wintry mix of snow, sleet and rain is expected to hit Monday afternoon.
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