The National Weather Service issued a severe thunderstorm warning for several counties in western Pennsylvania.

The warning is in effect until 7:45 p.m. for Butler, Lawrence and Mercer counties.

The storm is capable of producing quarter-sized hail and damaging winds in excess of 60 mph, according to the service. 

In additon, continuous cloud to ground lightning is being reported with this storm.

"Lightning is a killer," a statement from the service said. "If you can hear thunder, you are close enough to be struck by lightning."

A severe thunderstorm also remains in effect until 10 p.m. Thursday for all of western Pennsylvania.

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