The storms could produce large hail, damaging gusts and a few tornadoes.
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Why some storms turn into tornadoes
Not all thunderstorms can produce tornadoes - only about 30% of supercell thunderstorms actually spawn these rotating columns of air. Supercells are severe thunderstorms with intense, rotating ...
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Harrisburg PA tornado warning: Rotating thunderstorm triggers alert for Hershey, Dauphin County
Photos and videos of the storm quickly surfaced on social media as it moved through the area.
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