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    Among all of the Altocumulus cloud species, Altocumulus castellanus has the greatest impact on the weather forecast. So how to recognize it?

    photo: Ralph W. lambrecht;desc: Storm and tornado - bad weather.;link: https://www.pexels.com/photo/lightning-and-tornado-hitting-village-1446076/;licence: cc;

    Altocumulus castellanus (Ac cas) is a mid-level cloud with its base from 2 km (6,500 ft) up to 6 km (20,000 ft). They are very similar to Stratocumulus castellanus and the main difference is that they look smaller and there is no precipitation connected to them.

    photo: Bidgee;desc: Altocumulus castellanus cloud type.;link: https://commons.wikimedia.org/wiki/File:Altocumulus-Castellanus.jpg;licence: cc;

    But Altocumulus castellanus is a big help in predictions of incoming heavy showers or thunderstorms. Ac cas is created when a mid-level instability appears. If surface-based convection can connect to the mid-level instability, Ac cas can transform into Cumulonimbus clouds.

    photo: Daniele.Brundu;desc: Altocumulus castellanus cloud type.;link: https://commons.wikimedia.org/wiki/File:Altocumulus_castellanus.jpg;licence: cc;

    Have you ever seen this phenomenon? Send us your photos!

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