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"Arc-clouds" in Thunderstorms

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English (auto-generated)
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Logo of IWF (Göttingen)IWF (Göttingen)
 Ossing, Franz-Josef Zick, Christian

Formal Metadata

Title
"Arc-clouds" in Thunderstorms
Alternative Title
Böenlinien bei Gewittern
Author
Contributors
License
No Open Access License:
German copyright law applies. This film may be used for your own use but it may not be distributed via the internet or passed on to external parties.
Identifiers
IWF SignatureC 1358
Publisher
Release Date
Language
Other Version
Producer
Production Year1979

Technical Metadata

IWF Technical DataFilm, 16 mm, LT, 60 m ; F, 5 1/2 min

Content Metadata

Subject Area
Genre
Abstract
German
German
Entstehung und Ausbreitung der Böenlinien von Gewittern ("arc-clouds") werden im Zeichentrick und mit Hilfe von Zeitrafferaufnahmen geostationärer Wettersatelliten erläutert. Interpretation charakteristischer Gewitterformen. Vereinigung einzelner Böenlinien. Tag- und Nachtaufnahmen, u. a. im infraroten Spektralbereich.
English
English
Formation and Propagation of the wind-gust lines of thunderstorms ("arc-clouds") are explained in an animated movie and using time-lapse shots from geostationary weather satellites. Interpretation of characteristic thunderstorm forms. Coupling of single windgust lines. Day and night shots, some in infrared.
Keywords
German
German
English
English
IWF Classification
German
German
English
English
Transcript: English(auto-generated)
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.