The victim was struck by a 3 train about 10:30 a.m. inside of the Utica Avenue Station, the FDNY said.
The heaviest snow from Winter Storm Nemo was expected to fall late Friday into early Saturday.
Subways and buses continued running in the storm, but with some service changes.
The delays were caused by doddling straphangers, not any mechanical problems, MTA said.
The person was struck about 10 a.m. in the 110th Street Station, the MTA said.
The rupture sent water surging into the 23rd Street subway station.
The 5 and 7 trains are among 17 subway lines affected this weekend.
The victim was struck by a Bronx-bound 2 train about 10 a.m. Tuesday, a fire spokesman said.
A woman hit by an L train in Williamsburg Monday was expected to recover.
The incident, which disrupted the F and A lines, caused rush hour delays at the LES station.
The victim tried leaping onto the platform at the Hamilton Heights station early Wednesday.
The person was not hit by a train, but service along the B and C lines was disrupted, officials said.
A man sustained serious injuries after falling onto the Whitehall Station tracks.
The unidentified victim was taken to Brookdale Hospital with serious injuries, according to the FDNY.
The MTA has extended the R train to Whitehall Street station for the first time since Hurricane Sandy.
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