PITTSBURGH (KDKA) – A tornado warning has been issued for Northwest Pennsylvania.

The National Weather Service says a storm in southeastern Erie County could cause a tornado.

The storm is said to be moving into western Warren County.

Check out the nightly forecast:

A severe thunderstorm warning is also in effect until 9:15 p.m. in Mercer County.

The NWS says the storm has produced hail the size of golf balls.

Stay with KDKA for more information.

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