Philadelphia's 18-day stretch of dry weather expected to end Thursday. Here's the forecast.

Philadelphia's 18-day stretch of dry weather will come to an end Thursday. The NEXT Weather team is not expecting a complete washout, but scattered showers could interrupt the morning and evening commutes along the I-95 corridor.More widespread rain chances are expected north and west of Philadelphia, including the Lehigh Valley and Poconos.Despite the clouds, temperatures will climb into the lower 70s, so a heavy jacket won't be necessary. If you're heading out for lunch, you may even find some dry time between showers. Just don't leave home without that umbrella.NEXT big weather changesFriday brings the biggest weather story of the week as a more organized area of rain moves across the Delaware Valley.Periods of moderate to heavy rain are possible, along with a few thunderstorms late Thursday and the first part of Friday, especially east of I-95. Some locations could pick up 1 2 inches of rain, potentially creating ponding on the roads, slowing travel along I-95 and other major roads