UPDATE: Sewickley Valley Could See More Thunderstorms, Lower Temperatures

The National Weather Service in Moon Township says another round of showers and thunderstorms is expected through Friday morning in the region.

About 2 to 3 inches of rain has fallen across the Allegheny River Basin since Wednesday afternoon and the weather service expects an additional 1 to 2 inches of rain to fall again overnight into early Friday.

A flood advisory has been issued through Friday evening for the Ohio River at Pittsburgh. The rain could lead to rising streams and potential flooding in low lying areas, the weather service said.

In addition, Friday's predicted high temperature is expected to be 20 degrees cooler than Thursday.

Here's a detailed look at the forecast:

• Friday: Showers likely, mainly before 9 a.m. Cloudy, with a high near 58. Southwest wind 10 to 14 mph. Chance of precipitation is 60 percent. New precipitation amounts between a tenth and quarter of an inch possible.

• Friday Night: A slight chance of showers before 8 p.m., then a slight chance of showers after 10 p.m. Mostly cloudy, with a low around 41. West wind 8 to 10 mph. Chance of precipitation is 20 percent.

• Saturday: A chance of showers, mainly between 2pm and 3pm, then a slight chance of drizzle after 3 p.m.. Partly sunny, with a high near 46. West wind 14 to 16 mph. Chance of precipitation is 30 percent. New precipitation amounts of less than a 10th of an inch possible.

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