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| April 2009 tornado outbreak ： ウィキペディア英語版 |
April 2009 tornado outbreak
The April 2009 tornado outbreak was a tornado outbreak that affected large portions of the Southern United States on April 9–11 2009. At least 5 people were killed by tornadoes including three in Mena, Arkansas and two in Murfreesboro, Tennessee just south of Nashville. A total of 85 tornadoes were confirmed over the two days. Three people were killed in Texas due to wildfires caused by strong winds stemming from the same storm system.
==Meteorological synopsis==
A storm system over the southern Great Plains region resulted in severe weather development during the late afternoon and evening along a dry line that stretched from southern Kansas across northeastern Oklahoma into southwestern Missouri and northwest Arkansas. As a result, a moderate risk of severe weather was issued by the Storm Prediction Center for eastern Oklahoma, southeast Kansas, southwest Missouri and western Arkansas. The system approached as the atmosphere destabilized as a result of daytime heating. Thunderstorms began developmenting along a dry line in Oklahoma between 2 and 3 pm CDT (1900 and 2000 UTC). More thunderstorms started forming as they approached into western Arkansas, and encountered a strong wind field around the incoming system. Winds began turning with height, which caused some thunderstorms to rotate and spawn tornadoes. Beginning at 6:20 CDT (2320 UTC), several tornadoes were produced in eastern sections of Oklahoma and Texas. The severe weather then moved into Arkansas, where a tornado killed three people in Mena. The thunderstorms that affected Texas then went into Louisiana, creating numerous tornadoes in the state, one of which tracked through downtown Shreveport.〔
On April 10 (Good Friday), the storm system moved east into the Tennessee Valley and eventually into the Carolinas during the night. Ahead of the storm, warm and moist air quickly moved northeast into Alabama, Georgia, eastern sections of Tennessee and parts of the Carolinas. A separate band of strong jet stream winds went east across Mississippi and Alabama. The strengthening winds and increased moisture helped create conditions favorable for the development of supercells that could produce strong tornadoes. The Storm Prediction Center issued a moderate risk of severe weather for sections of the Tennessee Valley, Gulf Coast states and into the southern Appalachians region. As the system moved across the lower Ohio Valley area around the noon hour, a line of thunderstorms started to produce tornadoes in parts of Kentucky and Tennessee. One of the tornadoes that struck Tennessee early that afternoon killed two people in Murfreesboro. Portions of the moderate risk area in northeastern Alabama, northwestern Georgia and southeastern Tennessee were upgraded to a high risk at 1:44 pm CDT (1844 UTC).
The thunderstorms moved southeast across much of South Carolina, Georgia and Alabama later that afternoon and into the evening. They produced tornadoes in northeastern sections of Alabama, damaging homes in Langston and Powell. Further south, tornadoes damaged areas in central Alabama, one of which tracked through three counties and into the Montgomery Metropolitan Area. One area of thunderstorms that evening produced a long-tracked tornado that moved from Grovetown, Georgia, through Augusta and ended in Ellenton, South Carolina. The tornado moved across Augusta but missed the Augusta National Golf Club where the Masters Tournament was taking place during the weekend. The storm system reached the Atlantic Coast during the early morning hours of April 11, producing one tornado in North Carolina.
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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