In many situations Cirrus Cumulus clouds are hardly to distinguish
from fields of small Altocumulus clouds. The elements of Cirrus
Cumulus clouds have an angular extension below 1 deg. This is roughly
the width of the pinkie watching it with the arm spread out. Cirrus
Cumulus clouds do not give an own shadow. Altocumulus clouds have
an apparent angular width between 1 deg and 5 deg. Contrails can
sometimes help to distinguish them.
These five images display the flaked structure of
the Cirrocumulus clouds. In particular these Cirrocumulus clouds
derived from contrails which could have been noticed for quite a
long time before.
CirroCu1.jpg to CirroCu3.jpg:
Here different natural Cirrocumulus
clouds can be recognized which do not stem from contrails compared
to the images of the first row. The pictures were taken on the same
CirroCu4.jpg and CirroCu5.jpg:
A Cirrocumulus cloud at the top
left side is shown which changes to a Cirrus fibratus down right.
The both pictures present the same cloud, whereby CiCu1.jpg was
recorded earlier in the afternoon than CiCu2.jpg.
The neighbourhood and the views of the contrails
prove that these are Cirrocumulus clouds. Hence at a cruising altitude
above 8 km the probability is high to find ice-clouds. Furthermore
the contrail occurs below the Cirrocumulus cloud (CirroCu6.jpg to
CirroCu9.jpg). In CirroCu14.jpg a contrail casts a shadow on the
CiCu1-6.jpg: S. Borrmann, Ingelheim, Germany, July 2002
CirroCu1-3.jpg: S. Borrmann, Ingelheim, Germany, July 2002
CirroCu4+5.jpg: S. Borrmann, Pulpit Rock, Carinthia, Austria, December
CirroCu6-9.jpg: S. Borrmann, Brezzo di Bedero, Lago Maggiore Region,
North-Italy, 22 August 2004, 9:35 a.m.
CirroCu10-15.jpg: S. Borrmann, Brezzo di Bedero, Lago Maggiore Region,
North Italy, 22 August 2004, 7:34 p.m. to 7:39 p.m.