abstract:A tornado outbreak is the occurrence of multiple tornadoes spawned by the same synoptic scale weather system. The number of tornadoes required to qualify as an outbreak typically are at least six to ten.
A "tornado outbreak" is often defined as six or more tornadoes produced by the same weather system within a day.
VOA: special.2010.05.11
In 2011, he has reported on breaking news stories, including the largest tornadooutbreak in US history that moved through the Southeast, and the earthquake, tsunami and nuclear disaster in Japan.