Cirrus Clouds (Ci)
Cirrus Fibratus
Cirrus Floccus
Cirrus Spissatus
Cirrus Strat_Undulatus
Cirrus Uncinus
Jetstream Cirrus
Jetstream Cirrus II
Thin Cirrus
Thick Cirrus
Cirrus near Aircraft
Tropical Cirrus
Special Cirrus

Cirrus Stratiformis Undulatus

This layer of Cirrus clouds slowly developed in the late afternoon. It became denser and denser, until a significant part of the sky was covered.

CsUnd4.jpg and CsUnd5.jpg:
The wave structures of this Cirrus layer indicate strong turbulences in the upper troposphere. They most probably result from shearing between overlapping flows from different directions.

CiStrUnd1-3.jpg: S. Borrmann, Pulpit Rock (Kanzelhöhe), Carinthia, Austria, December 2001

CsUnd4+5.jpg: S. Borrmann, Ingelheim, Germany, 27 February 2002