Shelf clouds, also referred to as arcus clouds, happen at the vanguard of thunderstorms. They announce the arrival of storms and, when mixed with cumulonimbus thunderheads, can seem like big alien motherships. Shelf clouds kind when the cooler air of a thunderstorm encounters heat, humid air and lifts it. As the shelf cloud passes over you, you’ll discover a drop in temperature, and winds choose up because the gust entrance strikes by means of. Rain follows quickly behind.
Shelf cloud picture gallery
Bottom line: A shelf cloud, also referred to as an arcus cloud, varieties at the vanguard of thunderstorms and alerts that gusty winds are coming.
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