Sitting in the shade of their home Shalanda Holt, right, plays with her  daughter six-month-old Siani, as her sister Yolanda Holt reads on her mobile phone Thursday, July 21, 2011, in Philadelphia.  The National Weather Service says temperatures are expected to be near triple digits Thursday in Philadelphia, with a high of 96 degrees forecast for Pittsburgh. (AP Photo/Matt Rourke)

Photo by: Matt Rourke

Sitting in the shade of their home Shalanda Holt, right, plays with her daughter six-month-old Siani, as her sister Yolanda Holt reads on her mobile phone Thursday, July 21, 2011, in Philadelphia. The National Weather Service says temperatures are expected to be near triple digits Thursday in Philadelphia, with a high of 96 degrees forecast for Pittsburgh. (AP Photo/Matt Rourke)