What is the name of this cloud?

Arcus cloud
1863
Cirrostratus
788
Stratus
568
Nimbostratus
1422
Arcus clouds most frequently form along the leading edge or "gust fronts" of thunderstorm outflow; some of the most dramatic arcus formations mark the gust fronts of derecho-producing convective systems. Roll clouds also may arise in the absence of thunderstorms, forming along the shallow cold air currents of some sea breeze boundaries and cold fronts.
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Tschuka
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