© Danny Krull
Polenz, 01844 Neustadt in Sachsen, Germany
Latitude: 51° 1' 37'' N
Longitude: 14° 12' 3'' E
16 September 2012 1059 (Local Time)
Camera direction: towards SE
Image P/S code: S.1.4
Image I.D.: 4813
CL = 0, CM = 0, CH = 2
Notable features in this image are the partial 22° halo occurring in a Cirrus spissatus and a Cirrus fibratus. The Cirrus spissatus is starting to thicken, but is not yet thick enough to appear greyish when viewed towards the Sun. Filaments of the fibratus are irregularly curved or nearly straight; are white; and have more of a silky sheen than a fibrous (hair-like) appearance. Several contrails can also be seen at 5 and 6.
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The sounding from 180 km to the north-north-west and three hours after the photo was taken shows increasing high-level moisture over the previous 12 hours.
Dense patches of Cirrus spissatus following the passage of a surface cold front. The patches are aligned transverse to the upper level winds and also show signs of convective development, suggesting instability at their level. This is confirmed by a distinctive patch of Cirrus floccus with trails and Cirrus floccus in the initial stage of development. Some indistinctive mamma completes the story.
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