Children play in a fountain inside Washington Square Park on a hot summer day in New York July 12, 2011. [Photo/Agencies]

Children and adults cool off in the fountain inside Washington Square Park on a hot summer day in New York July 12, 2011. The National Weather Service has issued a heat advisory for New York City, with temperatures expected to top 95 degrees Fahrenheit (35 degrees Celsius), as an intense heat wave sweeps central and eastern parts of the country. [Photo/Agencies]