Table of Contents

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Christmas Storms over Western and Central Europe due to successive Rapid Cyclogenesis development.

II. Overview

Summary of typical cloud features

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Lothar and Lothar successor

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Martin

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III. Physical Background

Baroclinic zone and surface wave

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Upper level jet streak and left exit region

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Relation between upper level jet streak and surface wave

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The role of Potential Vorticity (PV)

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