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Cyclone Hergen : ウィキペディア英語版 | Cyclone Hergen
Cyclone Hergen was an intense European windstorm that moved across Northern Europe during mid December 2011. It was first noted over the central North Atlantic Ocean by the Met Office. It then later reached peak intensity just northwest of Ireland and then crossed the north of Scotland hours later. It hung around the coast of Norway for the next week before being absorbed by another strong windstorm named Joachim. Hergen was not the first storm to strike Western Europe during the last week as Cyclone Friedhelm brought widespread damage and very strong winds on 8 December. Hergen was followed by Joachim a few days later, then Oliver/Patrick (Cato/Dagmar) during the Christmas holiday. Cyclone Ulli then brought major damage and flooding to Northern Europe during the early part of January 2012. ==Meteorological history== On 11 December 2011, the Met Office had noted a complex weather system over the central Atlantic, associated with several warm and cold fronts. An amplified jet stream—a strong and fast-moving airstream aloft—advanced eastward, sparking rapid cyclogenesis along the fronts. By the following day, a low-pressure centre had developed along an occlusion between two of the fronts. The low rapidly deepened as it approached the British Isles, with a developing occluded rainband producing sustained winds of up to 60 mph (95 km/h). It later deepened to a minimum barometric pressure of , centred just northwest of Ireland. A wave was recorded off the coast of Donegal at 1400 UTC on 13 December. On 14 December, Hergen had moved slightly to the northeast while centred just off the coast of the Shetland Isles. By this time, the system had lost its weather fronts. The storm moved slowly offshore Norway for the next few days before being absorbed by the larger Cyclone Joachim on 19 December.
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