Strong and violent tornadoes? F4s and F5s? In Europe? Indeed, violent tornadoes are reported also in Europe, and one of the more prolific areas is Italy.
Approximately 600 tornadoes are reported to European Severe Storms Laboratory anually (662 in 2016). This is about half the number that is reported in the USA. A notable number of tornadoes reported in Europe are in Italy. The country enjoys a number of favourable meteorological factors that make it one of European hotspots for tornadoes.
http://www.severe-weather.eu/event-analysis/tornadoes-in-europe-italy/