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June 18, 2001, tornado outbreak
The June 18, 2001, tornado outbreak was a small, but fatal outbreak that occurred across the Upper Midwest on June 18, 2001. The outbreak spawned a long-tracked F3 tornado that killed 3 people, and caused around $10 million USD in damage. The tornado struck Siren, Wisconsin, a small village whose only siren was malfunctioning when the tornado moved through. Other less damaging tornadoes were confirmed in Iowa, Minnesota and Nebraska. Following the outbreak, areas affected by the Wisconsin tornado received multiple aid grants from local and federal authorities.
==Meteorological synopsis==
Meteorological conditions during the evening hours of June 18, 2001 rapidly began to deteriorate across the Upper Midwest. At 7 PM CDT (0000 UTC) an occluding cyclone was present over Northeast Minnesota, while a secondary front was located to its south. A zonally oriented warm front extended from the southern low, while a north-south cold front was located near the low pressure.〔 Cape values in Iowa were between the 3000 to 4500 J/kg range, and conditions were starting to deteriorate there as well.〔 By early evening a line of thunderstorms began to develop along the cold front across Eastern Nebraska and Iowa, and extended up into Minnesota.〔 The first tornado of the outbreak happened at 7:22 PM CDT (0022) near the town of Day, Minnesota. The tornado was rated an F1, and cut a path long through mostly rural areas.〔 At 7:36 PM CDT (0036 UTC) the second tornado of the outbreak, an F0, made a brief touchdown near Tekamah, Nebraska.〔 Some of the Iowa storms also rapidly developed into severe thunderstorms. At 7:59 PM CDT (0059 UTC) Harrison County fire and rescue reported that a tornado had touchdown near Modale.〔 The F0 was on the ground only briefly before lifting.〔 In Wisconsin convection with was firing up near the Minnesota state border, and an "Enhanced-V" signature became evident on one cell.〔(【引用サイトリンク】title=18–19 June 2001 - Siren, Wisconsin Tornado )〕 At 8:06 PM CDT (0106 UTC) an F3 touched down East-Northeast of Grantsburg.〔(【引用サイトリンク】title=Siren Tornado )〕 The tornado continued in an eastward direction moving through the towns of Alpha, Falun and Siren.〔〔 The tornado moved into Washburn County where it eventually dissipated near Spooner.〔(【引用サイトリンク】title=Event Record Details )〕 The last tornado of the outbreak occurred near Glidden, Iowa. It was rated an F0.〔 Many other storms also caused hail and wind reports across the Midwest, in association with this outbreak.〔
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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