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May 2009 Southern Midwest derecho
The May 2009 Southern Midwest Derecho was an extreme progressive derecho and mesoscale convective vortex (MCV) 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."〔Some residents of southern Illinois, in the tradition of giving female names to hurricanes, informally dubbed this storm "Ada May", in commemoration of its date, "eight o' May." (【引用サイトリンク】 first = Dawn )〕 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 was recorded by a backup anemometer at the Carbondale, Illinois, airport after official National Weather Service equipment failed.
==Meteorological synopsis==
A complex of thunderstorms formed over northwestern Kansas overnight May 7 and into the early morning hours of May 8, before moving into south-central Kansas, where greater moisture and stronger upper-level winds were present. The cluster of storms began to evolve into a more organized derecho near Hutchinson, Kansas, where National Weather Service damage surveys found winds greater than started, then continued through southern Missouri.〔 While in southwestern Missouri, the derecho began to change; supercells began to embed within the line, and a wake low began to form in conjunction with a bookend vortex on the northern end of the derecho.〔〔 As the derecho entered southeastern Missouri, the initial line associated began to weaken, but the MCV became increasingly pronounced on the northern end. Many experts and NWS meteorologists considered this to be one of the worst derechos and MCVs in the past decade.〔 The Storm Prediction Center issued two "particularly dangerous situation" severe thunderstorm watches and a vividly worded tornado watch, mentioning the possibility of winds in excess of . Local National Weather Service offices in Springfield, Missouri, and Paducah, Kentucky, also issued strongly worded severe thunderstorm warnings, with precautionary statements similar to those used in tornado warnings. As both the initial squall line and MCV weakened, very little severe weather was reported between southern Illinois and central Kentucky. However, as the weakening squall line encountered higher instability and more favorable upper-level winds, the line split into several supercells in a process still not fully understood; these storms produced several tornadoes in central Kentucky, eastern Tennessee, southwestern Virginia, and northwestern North Carolina.〔 While no longer producing severe weather itself, the MCV continued to enhance thunderstorms early the next morning across southeastern Virginia.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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