High Quality Content by WIKIPEDIA articles! The May 2009 Southern Midwest Derecho was an extreme progressive derecho and mesoscale convective vortex event that struck Southeastern Kansas, Southern Missouri, and Southwestern Illinois on May 8, 2009. Thirty-nine tornadoes, including two of EF3 strength on the Enhanced Fujita Scale, were reported in addition to high non-tornadic winds associated with the derecho and MCV. Due to the abnormal shape of the storm on radar and the extremely strong winds, many called this an "inland hurricane." A new class of storm, the Super Derecho, has been used to describe this event after analysis in 2010. Embedded supercells produced hail up to baseball size in Southern Missouri, a rare event in a derecho. A wind gust to 106 mph (171 km/h) was recorded by a backup anemometer at the Carbondale, Illinois airport after official National Weather Service equipment failed.