A woman jumps over a puddle Friday, Sept. 23, 2011, in downtown Philadelphia. According to the National Weather Service, an upper-level low over the Ohio Valley is expected to bring a steady flow of ... more 
A woman jumps over a puddle Friday, Sept. 23, 2011, in downtown Philadelphia. According to the National Weather Service, an upper-level low over the Ohio Valley is expected to bring a steady flow of tropical moisture up the Eastern Seaboard through the weekend. This enhanced moisture content, combined with a slow-moving frontal boundary, should lead to widespread rainfall across the eastern United States. (AP Photo/Alex Brandon) less 
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Associated Press | Photo By Alex Brandon
Fri, Sep 23, 2011 1:13 PM EDT