Flash Flood Warnings Issued In Eastern PA With Heavy Rainfall

This story was last updated at 6:09 p.m. Tuesday.

PENNSYLVANIA — New flash flood warnings have been issued in eastern Pennsylvania as another line of showers and storms moves in, bringing the threat of flooding and high winds after a stormy Monday that produced a tornado.

South central Bucks County, east central Montgomery County, and northeastern Philadelphia County are under a flash flood warning until 9:45 p.m. Tuesday according to the National Weather Service.

"At 5:44 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area," the alert said. "Between 1 and 1.5 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly."

Monday's storms knocked out power in communities around the state, and dumped more than three inches of rain in some parts of southeastern Pennsylvania. The NWS confirmed that a tornado caused damage in a path between Martin's Ferry and a community in northern New Jersey, but did not have more detailed information as of Tuesday afternoon. Read more — 1 Tornado Confirmed In PA As Next Storm Moves In: Latest Updates

Storms began redeveloping in the area around noon, and will persist this afternoon and into the evening according to the NWS. Isolated damaging winds, hail and flash flooding are all possible as another 1 to 3 inches of rain could fall, the weather service said.

Flood watches remain in effect in 13 counties, as the amount of rainfall Monday and so far Tuesday has swelled rivers and creeks. Some parts of southeastern Pennsylvania got more than three inches of rain.

The counties under a flood watch are: Berks, Carbon, Monroe, Delaware, Philadelphia, Chester, Montgomery, Bucks, Delaware, Lehigh, Northampton, Wayne, and Pike.

"Remain weather aware, especially if your area received significant rain yesterday or last night," said the NWS.

National Weather Service forecasters said they do not expect Tuesday’s storms to be as strong as Monday’s, “but at least some isolated flash flood warnings and severe thunderstorm warnings can't be ruled out.”

The easternmost part of the state is under a “marginal” risk of severe weather, while the rest of the state is anticipated to see a lower risk. That's compared to Monday's “enhanced” risk of numerous severe and persistent storms in the Philadelphia region, and the rest of eastern Pennsylvania's "slight" risk.

AccuWeather said locations along the Eastern Seaboard from North Carolina up through southern Vermont will experience this wet, windy weatherinto Tuesday evening "thanks to the influx of moisture from the Atlantic."

"Once again, damaging winds will be the most widespread risk, but downpours are also expected to be heavy during this time," AccuWeather.com forecasters added.

Wet weather with scattered storms is expected to linger in Pennsylvania until at least mid-week, when the daily threat of thunderstorms significantly lowers from Thursday to Sunday.

Here is a look at the forecast through Friday in southeastern Pennsylvania:

Tuesday afternoon: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 5pm. Some of the storms could produce small hail, gusty winds, and heavy rain. High near 80. South wind around 5 mph. Chance of precipitation is 80 percent. New rainfall amounts between a quarter and half of an inch possible.

Tuesday night: Showers and thunderstorms, mainly before 1am. Some of the storms could produce small hail, gusty winds, and heavy rain. Patchy fog before 1am, then patchy fog after 3am. Low around 64. South wind around 5 mph becoming west after midnight. Chance of precipitation is 80 percent. New rainfall amounts between a quarter and half of an inch possible.

Wednesday: A slight chance of thunderstorms, then a chance of showers and thunderstorms after noon. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 79. West wind 5 to 10 mph. Chance of precipitation is 30 percent. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday night: A chance of showers, mainly before 7pm. Partly cloudy, with a low around 60. Northwest wind around 5 mph. Chance of precipitation is 30 percent. New precipitation amounts of less than a tenth of an inch possible.

Thursday: Mostly sunny, with a high near 84. Northwest wind around 5 mph.

Thursday night: Partly cloudy, with a low around 62.

Friday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 86. Chance of precipitation is 40 percent.

Friday night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 50 percent.