The forecast for Tuesday and Wednesday remains largely unchanged. Chances for storms today (50-70%) increase on Tuesday (70-90%). Scattered thunderstorms will be capable of producing very heavy rainfall that could lead to localized flash flooding and locally damaging winds.

Showers and thunderstorms continue to develop this afternoon and evening. Isolated severe thunderstorms with damaging wind gusts will be possible and localized flash flooding is also a concern.

For the remainder of this evening and into the overnight period, a couple additional rounds of showers and thunderstorms are anticipated. The first is moving into portions of southeastern PA and northern Delaware now, and should continue spreading east.

An additional round is possible overnight, but less confidence on that. The main threat with the activity tonight will be locally heavy rainfall that could lead to flooding, as well as frequent lightning. The severe threat has diminished from earlier today, however we cannot rule out an isolated severe storm through the night.