Relentless downpours have brought flooding from parts of Ohio to western Pennsylvania with Pittsburgh being slammed Wednesday morning and midday and more is on the way.
Between 2 and 4 inches of rain has fallen on the Pittsburgh area since Tuesday evening. Some locations have received 1 to 2 inches of rain in as many hours.
According to Chief Meteorologist Elliot Abrams, "It is like getting a 20-inch snowstorm in a couple of hours."
The steep hillsides around the city and its suburbs cause water to run off rapidly.
Multiple reports from the public, trained spotters and emergency managers from Beaver, Allegheny and Washington counties indicate that mudslides and flash flooding have trapped some motorists and brought traffic to a standstill in parts of the region.
Because of the widespread flooding problems, officials are advising people to avoid the South Hills area of Pittsburgh at midday.
Another round of storms was bearing down on the Pittsburgh metro area during the midday.
According to Severe Weather Expert Henry Margusity, "Yet another round of severe thunderstorms with the risk of flash flooding could hit during the afternoon as a cool front begins to move in from the Great Lakes."
That front will shave temperatures and humidity in Pittsburgh and throughout much of the Midwest and Northeast late this week into the first part of the weekend.
For some areas, it could be the longest stretch of rain-free weather since the third week in June.