© Jarmo Koistinen
Helsinki, Finland
Latitude: 60° 0' 0'' N
Longitude: 25° 0' 0'' E
08 July 2011 1450 (Local Time)
Camera direction: towards N
Image P/S code: P.1.5
Image I.D.: 5505
CL = 2, CM = 0, CH = 3
Still anvil-shaped, this Cirrus spissatus cumulonimbogenitus is the remnant of a small, solitary Cumulonimbus capillatus incus some 45 minutes earlier.
A Cumulus cloud, predominantly of the species mediocris, completes the cloud observation.
This is a zoomed view. For more detail, see the accompanying image.
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Still anvil-shaped, this Cirrus spissatus cumulonimbogenitus is the remnant of a small, solitary Cumulonimbus capillatus incus some 45 minutes earlier. A newer Cumulonimbus capillatus incus, in the decaying stage of development, is approximately 60 km away on the left horizon. Flanking this cell are either Cumulus congestus or Cumulonimbus cells; the distance and relatively small size of the cells do not permit accurate identification from this image. Cumulus, predominantly of the species mediocris, completes the cloud observation. A zoomed view of the cell to the right is shown in the accompanying image.
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A southerly airstream brought hot, showery weather to the Guangdong coast near Hong Kong (China). The dense cloud is Cirrus spissatus and is all that remains of a Cumulonimbus cloud – this further defines it as cumulonimbogenitus. A Cumulonimbus calvus can be seen on the horizon.
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The cloud at the top of the image is Cirrus spissatus cumulonimbogenitus. It is the remains of a line of thunderstorms that developed three hours earlier, 100 km to the south and south-west of Hong Kong (China). Below this dense patch of Cirrus is another example of Cirrus spissatus cumulonimbogenitus. The parent Cumulonimbus of this dense patch has formed on a second line closer to Hong Kong. Cumulus congestus can also be seen developing on the eastern flank of the second line. These clouds are in the shadow of the setting Sun (the image was taken 36 minutes before sunset). Closer still to Hong Kong is a third line, comprised of Cumulus mediocris on the eastern flank and increasing in size to Cumulus congestus in the middle.
Haze has been transported and trapped offshore.
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(NB. Hour of day estimated)
A dissipating Cumulonimbus has left a small patch of Cirrus and is showing some remnant precipitation at 2. Other Cumulus and Cumulus congestus are forming along a N-S escarpment across the Texas Panhandle. The area was in a south-easterly low-level flow ahead of a dry line. Later in the day, a much stronger Cumulonimbus developed just ahead of the eastward-moving dry line near this location.
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The four photographs in PRE.101, PRE.100, PRE.103, PRE.102, show the formation of Cirrus spissatus by several Cumulonimbus along the east shore of the large inland Lake Okeechobee under easterly low-level flow. When the updraughts moved from the heated land to cooler water, they weakened and the upper portions persisted until only Cirrus remained.
In this image, five minutes later (after PRE.101), the clouds have continued to mature and dissipate. The Cumulonimbus on the left has become more fibrous at the top, and the smaller congestus on the right has started to dissipate.
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The four photographs in PRE.101, PRE.100, PRE.103, PRE.102, show the formation of Cirrus spissatus by several Cumulonimbus along the east shore of the large inland Lake Okeechobee under easterly low-level flow. When the updraughts moved from the heated land to cooler water, they weakened and the upper portions persisted until only Cirrus remained.
This photo was taken after another five minutes, or 16 minutes after the first photo (PRE.101). The Cumulonimbus on the left has now assumed an appearance similar to that of the older Cirrus cloud at 5 in the first photograph. A new congestus tower is beginning to grow at 6, but it will also dissipate rather quickly as did these nearby clouds in this sequence.
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