A tornado lookalike swirled on a baseball diamond in Williamsburg, a witness said.
The city could see up to 3 inches of rain over next 48 hours, forecasters predict.
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.
As temperatures reached 90 degrees, New Yorkers recollections of the frosty winter fade.
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.
Some light showers are expected Tuesday, with the worst of the rain beginning Wednesday afternoon.
A freeze warning was in place Wednesday morning.
Flurries are expected to start falling around 7 p.m. Tuesday, the National Weather Service said.
The city could get hit by up to two inches of snow Tuesday, experts said.
Schools were open and subways running close to normal for Monday's rush-hour commute.
Forecasters predicted the city could see as much as 10 inches of snow on Sunday through Monday.
A wintry mix of snow, sleet and rain is expected to hit Monday afternoon.
Central Park is looking at another two inches of snow Wednesday, the National Weather Service said.
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