National Weather Service Issues Flood Warning as Storms Unleash More Rain

As storms continue to roll through the area, the National Weather Service issued a flood warning for urban areas and small streams Friday night.

The warning covers Allegheny, Beaver, Butler and Westmoreland counties until 2:30 a.m. Saturday.

The National Weather Service also issued a flash flood watch at 9 p.m. Friday that is in effect until 4 a.m. Saturday.

The flash flood watch area encompasses Allegheny, Butler and Beaver counties. A flash flood watch means conditions may develop that lead to dangerous flash flooding.

“Some locations in Western Pennsylvania received between one and four inches of rainfall on Thursday,” the National Weather Service reports. “With additional rainfall expected to move into the region this evening … the possibility exists that flash flooding could develop.”

"At 8:27 p.m. EDT slow-moving thunderstorms across the warning area have dropped over two inches of rain in the past several hours," the weather service website states.

"Additional rainfall is expected through midnight tonight," it said.

"Road flooding can be expected in highly urbanized areas where heavy rain persists," it said. "Residents along streams and creeks should be alert for rising stream levels."

A flood warning means flooding is imminent or has been reported. Additional heavy rain might cause flash flooding.

"Most flood deaths occur in automobiles. Never drive your vehicle into areas where the water covers the roadway," the National Weather Service warns. "Flood waters are usually deeper than they appear. Just one foot of flowing water is powerful enough to sweep vehicles off the road."

If you see flooding in your area, please let us know by posting in the comments.