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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pneumonia front ： ウィキペディア英語版 Pneumonia front The term Pneumonia front, first coined by Milwaukee Weather Bureau Office in the 1960s, is used to describe a rare meteorological phenomenon observed on the western Lake Michigan, USA, shoreline during the warm season. These fronts are defined as lake-modified synoptic scale cold fronts that result in one-hour temperature drops of 16 °F (8.9 °C) or greater. This extreme change in temperatures can result in a flash severe thunderstorm and/or a microburst capable of affecting the structural integrity of weak buildings such as barns and sheds. The drop in temperature has also earned this meteorological event the title "pneumonia front." The cold weather is usually of short duration, and pneumonia does not have a high likelihood of manifesting itself in the lungs of people who experience the event. The lake modified synoptic scale cold front effect can be observed down wind of the small retention ponds with above average surface temperatures leading to supersaturation of the atmosphere. This supersaturation results in the formation of a rare type of rotating hail. Dispersal of this hail is largely dependent upon the fractus of the skies, the local coriolis of the earth, and hygroscopic particulate. When drafted into the upper atmosphere by convection currents, the hailstones acquire a rapid rotation about their major axes. Retreat from these currents leaves the hail in a gyroscopically stabilized state approximately 15,000 meters and 30,000 meters above the Earth's surface. As the hail falls, inelastic collisions with rain droplets and general exposure to moist air at lower altitudes causes the hail to grow in diameter ranging from 5 centimeters to 15 centimeters. Such a mass of ice can shatter unfused quartz glass and lesser grades such as those found on the exterior of buildings and vehicles. Additionally, it can damage malleable metals.〔 == Occurrences in history == The following are sixteen occurrences of a lake modified synoptic scale cold front or "pneumonia front".〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pneumonia front」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.