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March 1997 tornado outbreak
The March 1997 tornado outbreak was a major tornado outbreak that struck portions of the central and southern United States on March 1–2, 1997. Affecting areas mostly from Arkansas to Kentucky, the outbreak produced 58 tornadoes, including three violent (F4) tornadoes, and killed at least 27 people, including 25 in Arkansas alone and one death each in Mississippi and Tennessee. This was Arkansas' deadliest tornado outbreak since May 15, 1968, when 34 were killed in Jonesboro. Severe flooding also occurred across the Ohio and Tennessee Valleys, resulting in 16 Ohio counties and 44 Kentucky counties being declared disaster areas. The flash floods and damaging wind elsewhere caused 34 deaths across six states including 19 in Kentucky, five in Ohio, five in Tennessee, two in Texas and three in West Virginia. Damage estimates were about $1 billion (1997 USD)〔 while 75,000 homes were damaged.
==Meteorological synopsis==
On March 1, 1997, very unstable air invaded much of the affected area while much warmer temperatures were recorded. Temperatures across most of Arkansas which normally at that time are below reached the mid to upper 70s °F (24 °C). A cold front was approaching from the Midwestern Plains and was associated with a strong low further north. Strong temperature contrasts were observed on either side of the front. In addition, wind near the ground and aloft were very strong and significant shear was noted before given additional ingredients for extreme severe weather across the Mississippi and Tennessee Valleys on March 1, 1997. On February 28, 1997, the Storm Prediction Center (SPC) had issued a Day 2 moderate risk of severe weather for much of Arkansas and a tornado watch was issued for the western and central part of the state during the morning hours of March 1. Early on March 1, the SPC issued a tornado watch for portions of the Mississippi and Tennessee Valleys. Throughout the day, the National Weather Service office in Little Rock, Arkansas, issued 57 weather warnings, including 34 tornado warnings. Areas affected by the deadly tornadoes had tornado warnings with lead time estimated at between nine and 28 minutes.〔
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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