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2006 London tornado
The 2006 London tornado was a significant United Kingdom tornado spawned from a squall line moving over the city on 7 December 2006 at approximately 11:02 GMT. Its intensity is estimated to have been T4 on the TORRO scale, equating to F2 on the Fujita scale.
== Meteorological synopsis ==
On the morning of 7 December, the UK was under the influence of a strong Atlantic low pressure system, which was named ''Ulrike'',〔(【引用サイトリンク】url=http://www.met.fu-berlin.de/de/wetter/maps/Analyse_20061207.gif )〕 bringing unstable weather conditions to much of the UK, and the south in particular. At approximately 07:30 GMT, a small band of thunderstorms initialised over Cornwall moving east-northeast across the country. By approximately 10:00 am, the squall line had reached Salisbury, where a drop in humidity was recorded, which may have resulted in an increase of atmospheric pressure behind the squall, causing it to accelerate forward. This increased motion in combination with a change in wind direction ahead of the storm may have initialised the rotation of the mesocyclone in one of the now strong storm cells, resulting in the touchdown of the T4 tornado in Kensal Rise, London, at 11 am.
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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