© Hing Yim Mok
美国,夏威夷,檀香山市中心
纬度: 21° 18' 25'' N
经度: 157° 51' 30'' W
29 June 2016 1206 (当地时间)
摄像机方向:朝向南
图像P/S代码: P.4.5
图像I.D.: 5787
CL = 2, CM = 8, CH = 2
图中有低层积云、中层高积云和高空卷云。地平线上是中等垂直厚度的积云(中云)。
图中主要的云是絮状高积云(有小积云簇),从云中降下冰晶雨幡的纤维尾 。该云酷似钩卷云,但不可归为此类,因为云簇不是纤维状,且整体上无丝般光泽。
图中还有几簇絮状高积云,因为它们已完全冻结,因而发展成为高积云性密卷云。
最终观测到了厚、长的密卷云块。
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乍看像是一个絮状高积云和钩卷云天空。然而,所有的云都是絮状高积云(小积状云簇),冰晶雨幡的纤维尾从云中落下。云簇既非纤维状也无丝般光泽可确认这一观测。
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探测无法确定絮状高积云高度。614 hPa的合理水汽被–0.7 °C的温度所抵消,这个温度对于此类冰晶雨幡的厚尾过于温暖。絮状云可能是在440 hPa(6900米),此处温度为–15.7 °C。这一高度尚处于WMO温带和热带中层高度范围内。
在照片顶部,云底破碎的小云簇是絮状高积云。冰晶雨幡的纤维状尾正从南侧(右侧)絮状云簇落下。
教堂塔尖左侧更大的积状云团是堡状高积云,它由于堡状云底的消散而逐渐演变为絮状云。
有一个从最大单体落下冰晶雨幡的突出实例。该单体仍可确定为高积云,因为云簇的大部分没有纤维状或丝般光泽。
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The cloud elements have the form of small tufts and clearly show a cumuliform appearance. Some of them (1, 2) resemble Cumulus fractus in their compactness and in the absence of a horizontal base. Most of the elements are ragged and scattered (3); a few (4) look like white balls without shading. Near the horizon the elements are in staggered lines (5). A small thundery trough of low pressure was situated over western England and Brittany with a flow of maritime polar air from the south-west over southern England.
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The major part of the picture is occupied by isolated small tufts of cumuliform appearance which are Altocumulus floccus: there are also some clouds of the species castellanus, their common base being distinguishable for instance at 2. Altocumulus lenticularis is present at various places (3, 4). It is not unlikely that the initial condensation took place in the form of lenticularis, then cumuliform sproutings may have developed from the lenticular base, thus forming castellanus, and finally the floccus formed as a result of the disappearance of the base. A small anticyclone was breaking down simultaneously with the entry of a weak maritime flow over the continent. Thunderstorms, first observed in the south-western part of France, spread over the whole country.
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