What appears to be harmless little whirlwinds and dust devils turns out to be a precursor to something deadlier and ends up threatening New York City's very existence.What appears to be harmless little whirlwinds and dust devils turns out to be a precursor to something deadlier and ends up threatening New York City's very existence.What appears to be harmless little whirlwinds and dust devils turns out to be a precursor to something deadlier and ends up threatening New York City's very existence.