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A WCB Occlusion is accompanied by a distinct cloud spiral; clouds of all three frontal parts CF, WF and WCB Occlusion are multilayered.

Mid-level cloud streets and/or high level cloud sheets extending from the mountain ridges to the lee side. They develop when the wind stream is almost…

Upper Waves are cloud bulges at the rear edge of Cold Front cloud bands. They are associated with upper level processes and do not develop.

Development of thicker and mostly more convective cloud within a frontal cloud band in the left exit region of a jet streak during frontal crossing.

Jet Fibres are long and narrow bands of high clouds caused by the Jet streak. They usually form directly attached to Cold Fronts or Warm Front Shields.

During an Instant Occlusion process, a Comma approaches and merges with a frontal cloud band. As a consequence, an Occlusion-like form of a cloud spiral…

Orography has a strong influence on the propagation of frontal cloud bands; some parts can be retarded which might result in a delay or a decoupling of…

Foehn is a wind system created by the impact of orographic obstacles like mountains on the flow, which often shows a typical cloud structure.