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CuMediocris1.jpg and CuMediocris2.jpg: These Cumulus clouds already
exceeded the Humilis stage. Since they occur in the lowest level
they have to be named as Stratocumulus mediocris. The cloud base
is everywhere at the same level, the "lifting condensation
level". Therefore these clouds which are characteristic for
fair weather derive from ascending bubbles of warm air. CuMediocris3.jpg and CuMediocris4.jpg show in the foreground Cumulus
mediocris clouds. In CuMediocris3.jpg also Cumulus humilis (in the
foreground) and Cumulus congestus (in the centre) are pictured as
well as Cumulonimbus incus (in the back, below the Cirrus clouds)
and Cumulonimbus calvus (left border in the back below the anvil).
At the centre and at the back of CuMediocris4.jpg Cumulus congestus
occur. CuMediocris5.jpg and CuMediocris6.jpg: The pictures were taken during the descent of the aircraft at Fortaleza, North-Easterly Brazil. They display side views of Cumulus mediocris clouds. |
The painting "In the Moor" by Fritz Overbeck (1869 -
1909) presents Cumulus mediocris clouds and a layer of Altocumulus
perlucidus translucidus above. The clouds do not have a distinguished
lower level. So they were likely not formed by convection at the
pictured location (as the clouds in CuMediocris1.jpg), but were
advected from their origin farer away to the focus of the painter.
During the transportation the lower level could be altered by turbulences.
The occurrence of Altocumulus clouds might indicate that the Cumulus
mediocris have been formed sometime before the "shoot".
Hence the Ac reduce the short-wave radiation which hits the ground
and warms it up. Under these circumstances the convective formation
of small clouds becomes less probable. The picture was painted in
1901 and is exhibited in the new Pinacoteque in Munich.
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CuMediocris1.jpg: S. Borrmann, Stockholm, Airport Arlanda, 22
June 2002, 1 p.m. Camera Parameters Olympus E-1 SLR with a 14-54 mm objective. Exposure and sensitivity choice (200 ASA) was performed by the program automation of the camera. The images were recorded in the sRGB color range with a resolution of 2560 x 1920 Pixel x 24 colours. |
Lens aperture
|
Time of exposure
|
Focal length
|
Time
|
|
CuMediocris2.jpg |
9 |
1/800 |
54 |
2:11:08 p.m. |
CuMediocris3.jpg |
9 |
1/800 |
54 |
2:26:42 p.m. |
CuMediocris4.jpg |
9 |
1/800 |
54 |
2:30:04 p.m. |
CuMediocris5.jpg |
11 |
1/640 |
20 |
2:43:40 p.m. |
CuMediocris6.jpg |
10 |
1/640 |
25 |
2:44:55 p.m. |