"Arc-clouds" in Thunderstorms
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Formale Metadaten
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Lizenz | Keine Open-Access-Lizenz: Es gilt deutsches Urheberrecht. Der Film darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. | |
Identifikatoren | 10.3203/IWF/C-1358eng (DOI) | |
IWF-Signatur | C 1358 | |
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Produktionsjahr | 1979 |
Technische Metadaten
IWF-Filmdaten | Film, 16 mm, LT, 60 m ; F, 5 1/2 min |
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Transkript: Englisch(automatisch erzeugt)
00:09
Thunderstorms and arc clouds. The mature stage of a thunderstorm is
00:20
characterized by an intense updraft and a neighboring downdraft. The cold air produced within the cloud accelerates downward and spreads at the surface. The leading edge of this cold air shows many characteristics of a cold front. It is accompanied by a pronounced squall. Frequently it is
00:47
marked by a characteristic arc cloud. Mostly the pseudo cold front moves
01:02
faster than the thunderstorm itself. It occurs that it travels more than a hundred kilometres ahead of the thundercloud. From space it appears this
01:24
way. The following scene has been prepared from the geostationary satellite Meteosat-1 exhibiting the development of a large thunderstorm
01:43
system over Nigeria. The narrow band of convective clouds traveling radially
02:08
away from the thunderstorm is an example of a typical arc cloud concurrent with the pseudo cold front of the laterally spreading cold downdraft, the squall. In this case the squall travels to distances of 400
02:29
kilometres from the thunderstorm center. In this scene a group of
02:52
thunderstorms develops over southern Algeria. They create a number of arc clouds which interfere and finally organize themselves in a larger squall
03:04
front. At least three distinct formations of arc clouds can be observed around this thunderstorm cluster. They grow together and in the
03:21
direction of 1,000 kilometres in diameter. This is the same scene as
04:06
viewed in the infrared spectral range. Thus it becomes possible to trail the further development of the arc cloud structures throughout the following night.
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