A line of persistent showers and thunderstorms stretched from Long Island Sound to Cape Cod. Some areas in this zone had more than 3 inches of rain this morning, and there can be highway flooding in localized heavy showers this afternoon and evening. This radar shows the rain zone just after 10 a.m. ET.
This map shows the predicted upper-air flow for tomorrow night. Our timing estimates suggest showers and some thunderstorms could affect the I-95 corridor from Portland and Boston to New York City (and perhaps Philadelphia) on Sunday.
As moisture from former hurricane Delores moved northward, the dynamic changed, and thunderstorms broke out. This map shows the more than 300,000 strokes that occurred between early yesterday and early today.
The recent volatility of the weather in many areas of the Central and Eastern states is demonstrated by the widespread thunderstorm activity of the last couple of days. The lightning map shows hundreds of thousands of lightning strokes between 7 a.m. ET yesterday and about the same time today:
A narrow band of territory that in winter is one of the Buffalo area's southern snow belts received more than 5 inches of rain in just a few hours. Water seemed to rage everywhere, and people had to be evacuated from their homes in the dark of night.
This NWS Storm Prediction Center map shows the risks for today. Please note that "moderate" risk areas, like the one present on today's map, are relatively rare, signifying the danger of major disruption in the worst storms