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 develops.
Common Remarks
The name Instant Occlusion results from the resemblance of the mature stage of development of the cloud system with that of an Occlusion. But the meteorological background of the development is completely different from an Occlusion process where warm air is lifted from the surface (see Occlusion: Warm Conveyor Belt Type ). The process of the Instant Occlusion is characterized by the mergence of a distinct cold air, Comma-like cloud feature (see Comma ) with a cloud band associated with the polar front (Cold Front).
The adjective instant represents the fact that the Occlusion appearance is assumed suddenly without the usual development at a front.
I. Cloud Structure In Satellite Images
Learn about how to recognise and detect Instant Occlusion in satellite images.
II. Meteorological Physical Background
Find out more about the meteorlogical and physical background of Instant Occlusion.
III. Key Parameters
Learn which key parameters to use for Instant Occlusion
IV. Typical Appearance In Vertical Cross Sections
Find out the typical appearance of Instant Occlusion in vertical cross section
V. Weather Events
Explore the weather events associated with Instant Occlusion
VI. References
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