What specific accessory cloud structure signals the imminent arrival of a strong gust front, meaning high winds are minutes away?

Answer

Shelf Clouds (Arcus cloud)

A shelf cloud, which is a low, horizontal, wedge-shaped accessory cloud attached to a thunderstorm base, always signals an approaching strong gust front, leading to high winds and heavy rain shortly thereafter.

What specific accessory cloud structure signals the imminent arrival of a strong gust front, meaning high winds are minutes away?

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