Southern Great Lakes Derecho
This derecho got its start from a developing low pressure system that moved into the northern Great Plains and Great Lakes. The derecho formed from the same storm system that spawned the Spencer, SD Tornado, which killed six people. The supercell thunderstorm which produced that tornado transitioned into the derecho which killed another six people.
Late in the evening on May 30, the tornado-producing supercells merged and became one squall line. It developed further and became a bow echo system.
It would become the most destructive natural disaster to hit the Upper Midwest in recent memory.
Read more about this topic: Late-May 1998 Tornado Outbreak And Derecho
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