Thom Carroll/for PhillyVoice SEPTA, the Philadelphia Streets Department, and the School District of Philadelphia are making preparations for Wednesday's snowstorm. Above is a file photo. Philadelphia officials outlined the preparations for Wednesday's nor'easter, which forecasters say could blanket parts of the city in upwards of 10 inches of snow between Wednesday afternoon and Thursday morning. The National Weather Service has issued a winter storm warning for Philly, the surround counties and parts of central New Jersey. In Philadelphia, the snow is expected to start around 3 p.m. Wednesday. It will become a wintery mix of snow and sleet Wednesday night and snowfall could continue into late Thursday morning, NWS meteorologists predict.