© Matthew Clark
Salcombe Regis, Sidmouth, Devon, United Kingdom of Great Britain and Northern Ireland
Latitude: 50° 41' 36'' N
Longitude: 3° 12' 26'' W
17 November 2012 1400 (Local Time)
Camera direction: towards SW
Image P/S code: S.3.13.1
Image I.D.: 5922
CL = 1, CM = 7, CH = 8
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Dissipating Altostratus revealing Cirrostratus
In this rather complex photograph, the cloud at the highest level is Cirrostratus. It is also the brightest and is best seen on the right of the image, although brighter areas are visible through lower cloud in other parts of the image. The Cirrostratus is on the rear edge of a cold front and slowly cleared the area over the next six hours. Part of a faint 22° halo helps confirm the genus as Cirrostratus. Beneath the Cirrostratus (for example, above and to the right of the Sun) are darker wisps of Cirrus fibratus, oriented from the lower left to the upper right. They are poorly illuminated due to screening by the higher Cirrostratus layer and the low angle of the Sun, and so are not the typical white. Also visible are several patches of darker cloud that do not appear wispy. These are residual patches of Altostratus that are dissipating (4, 5 and 6); they have a more horizontal, left-to-right aspect. Towards the horizon are patches of Altocumulus with a lenticular appearance that are clearly lower than the Altostratus. Small patches of Cumulus fractus are visible over the land on the right.
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© Matthew ClarkSalcombe Regis, Sidmouth, Devon, United Kingdom of Great Britain and Northern IrelandLatitude: 50° 41' 36'' NLongitude: 3° 12' 26'' W17 November 2012 1400 (Local Time)Camera direction: towards SWCL = 1, CM = 7, CH = 8Image P/S code: S.3.13.1Image I.D.: 5922
The surface analysis chart for 1200 UTC shows southern England, UK in a north-westerly flow, between a ridge of high pressure over the Atlantic and a low of 980 hPa centred east of Iceland. A weak cold front is moving south-east over the area.
© Crown Copyright
Invading Cirrostratus fibratus duplicatus undulatus
The photo shows invading Cirrostratus fibratus in the form of a continuous veil more than 45° above the horizon. There are two layers of Cirrostratus. The lower layer is in the shadow of the Earth and is shaded grey, while the higher layer has fibratus bands streaming from the south-west (bottom left to top right); a wave pattern can also be seen in this layer. The wave pattern is transverse to the winds at cloud level, confirming the identification of the variety undulatus.
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© Michael BruhnAspendale Gardens,Victoria, AustraliaLatitude: 38° 1' 28'' SLongitude: 145° 6' 48'' E21 February 2016 1902 (Local Time)Camera direction: towards WSWCL = 0, CM = 0, CH = 6Image P/S code: P.3.13Image I.D.: 5965