PITTSBURGH (KDKA) — A tornado warning was issued for several Western Pennsylvania counties on Saturday.

Butler, Clarion, Venango and Armstrong Counties were all under a tornado warning until 8:15 p.m.

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A tornado was reported on the ground 11 miles east of Slippery Rock by law enforcement and a trained spotter around 7:50 p.m., moving at 30 miles per hour.

Photo: Robert Gulish

Photo: Robert Gulish

The National Weather Service reported that flying debris would be dangerous to those caught without shelter, mobile homes could be damaged or destroyed and damage to roofs and windows was likely.

All people in affected areas were advised to take shelter immediately.

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