According to Jonathan Erdman, senior meteorologist for weather.com, the storm was brought on by a vigorous southward plunge of the jet stream that carved into western Europe sending a potent upper disturbance into the Italian peninsula Saturday.
That instability then charged up thunderstorms over the Mediterranean Sea, which swept into Italy. "The satellite signature was classic for a severe thunderstorm, or cluster of storms."
Social media posts recorded hail near Lake Como in Northern Italy as well as the in the Naples area.
A massive hailstone found near Pozzuoli, Italy. (Instagram/barber8813)
"Baseball size hailstones fall from thunderstorms at speeds of at least 75 mph, so it's no wonder you can see the magnitude of smashed windshields and structural damage," said Erdman...
http://www.weather.com/storms/severe/news/baseball-hail-italy-pozzuoli-naples-sep2015
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