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NCAS CDAO Sky-Camera Time-Lapse Video for 2009-03-25 17:25 UTC (showing Altocumulus fluctus and Altocumulus undulatus clouds followed by Altocumulus lenticularis)

Hooper, David A (2019) NCAS CDAO Sky-Camera Time-Lapse Video for 2009-03-25 17:25 UTC (showing Altocumulus fluctus and Altocumulus undulatus clouds followed by Altocumulus lenticularis). [Video]

[img] Video
ncas-cdao-sky-camera_time-lapse_20090325-1725_AltocumulusFluctus.mp4
Available under License Creative Commons Attribution.

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Official URL: http://mst.nerc.ac.uk

Abstract

A time-lapse video showing Altocumulus fluctus and Altocumulus undulatus clouds followed by Altocumulus lenticularis. The short-lived fluctus cloud feature is caused by Kelvin-Helmholtz wave activity, which is generated where the wind speed changes sharply with altitude. The initial telephoto image shows the characteristic breaking-wave pattern. This was taken (at 17:37 UTC) at the same location as the camera used to to generate the video sequence, but shows a narrower field of view. The wave activity is also revealed by the Altocumulus undulatus cloud elements, which form in parallel bands. There is evidence of mountain wave activity throughout the sequence and Altocumulus lenticularis becomes the dominant cloud type towards the end. These clouds remain stationary relative to the landscape rather moving with the wind. Occasional contrails and Cirrus clouds can be seen at a higher level (one of the contrails develops undulatus features). These remain illuminated for longer than the Altocumulus clouds as the sun sets. This video has been created from images taken by the Sky-Camera at the National Centre for Atmospheric Science (NCAS) Capel Dewi Atmospheric Observatory (CDAO) near Aberystwyth, UK - formerly known as the Natural Environment Research Council (NERC) Mesosphere-Stratosphere-Troposphere (MST) Radar Facility. The images are freely available under a UK Open Government Licence from http://tinyurl.com/nerc-mstrf-sky-camera/ . For more details visit http://mst.nerc.ac.uk .

Item Type: Video
Uncontrolled Keywords: Time-Lapse Video, Clouds, Altocumulus fluctus, Altocumulus undulatus, Altocumulus lenticularis, Cirrus, Contrail
Subjects: Education
Atmospheric Sciences
Meteorology and Climatology
Physics
Depositing User: Dr David Hooper
Date Deposited: 16 Dec 2019 11:34
Last Modified: 16 Dec 2019 11:34
URI: http://cedadocs.ceda.ac.uk/id/eprint/1462

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