Bits of Halley's Comet will streak into the Earth's atmosphere before dawn on Monday during the peak of the eta Aquarid meteor shower. Moonlight will not interfere with the show, making this likely the best meteor display for northern hemisphere observers until the Perseids in August, and the best all year for southern hemisphere viewers.
The weather prediction for Philly is partly cloudy. Not what I was hoping for, but it could be worse.