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Arcus clouds usually form with cumulonimbus clouds and downdrafts. This means they tend to be associated with strong, gusty winds, heavy rain or hail showers, as well as thunder and lightning.

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It explains: "Arcus clouds are spectacular low-level, long and thin clouds associated with powerful thunderstorms. They are sometimes seen beneath Cumulonimbus clouds.

The sun heats the ground, and that air rises, cools, and condenses to form these towering cumulonimbus clouds. At the top of these clouds, the air is so cold that ice forms! At the bottom of the cloud ...