Forecasters: Rainy start to August expected

National Weather Service map showing which areas saw above-normal rainfall amounts in July.

After Philadelphia hit rainfall records in both June and July, forecasters say August will also get off to a rainy start.

More showers and thunderstorms are expected Thursday, with some producing heavy rainfall, according to the National Weather Service.

The weather service says there is potential for flooding in poor drainage areas and small streams.

There's a chance of rain beginning overnight and lasting through early Friday morning. Showers appear most likely between noon and 5 p.m. Thursday.

The forecast for a wet start to August comes after a number of rainfall records were broken in Philadelphia throughout June and July.

As of this morning, 13.24 inches of rain have fallen this month, 9.03 inches above normal and breaking the previous record for the month of 10.42 inches. The 10.56 inches of rain that fell in June set the precipitation record for that month. A number of individual days also broke daily rainfall records.

"This summer there has only been two precipitation regimes: Observing heavy rain or forecasting it to occur," a weather service forecast discussion says.

Much of the Northeast and Mid-Atlantic also saw significantly above normal amounts of precipitation in July, the weather service says.

Thursday's expected storms are expected to hit a number of other East Coast cities, from D.C. to Boston. The water-logged ground from other recent storms increases the risk of flooding, AccuWeather says.

Contact Emily Babay at 215-854-2153 or Follow @emilybabay on Twitter.

Contact the Breaking News Desk at 215-854-2443; Follow @phillynews on Twitter.