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NEW YORK - JULY 10:  A man wipes sweat from his face July 10, 2007 in New York City. New York City is experiencing a second day of a heat wave with temperatures in the upper 90`s and uncomfortable humidity levels.  (Photo by Spencer Platt/Getty Images)
NEW YORK - JULY 10:  A man wipes sweat from his face July 10, 2007 in New York City. New York City is experiencing a second day of a heat wave with temperatures in the upper 90`s and uncomfortable humidity levels.  (Photo by Spencer Platt/Getty Images)

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Nighttime 'lows' more dangerous than highs

The hazards of heat waves continue even after the sun goes down. CNN meteorologist Jennifer Gray explains.

Nighttime 'lows' more dangerous than highs

The hazards of heat waves continue even after the sun goes down. CNN meteorologist Jennifer Gray explains.