Very strong tornadoes in Italy in late autumn

Late autumn is tornado season in western, central and southern Italy. Warm sea surface of the Mediterranean sea and very moist airmass combine with deep troughs to produce very unstable environments. Additionally, the deep troughs are rounded by strong jetstreams providing strong winds aloft. Secondary cyclogenesis over the northern Mediterranean often results in very strong low level / surface southerlies, providing strong vertical veering wind profiles, conductive for supercells and tornadoes. In particular, the same setups that produce training cell convective lines, torrential rainfall and major floods in Liguria and Tuscany also tend to produce tornadoes. Also, as autumn progresses and deep troughs reach further into the central Mediterranean. With remaining high instability in place (2000+ J/kg MLCAPE not unusual … Continue reading Very strong tornadoes in Italy in late autumn