The backside of a shelf cloud resembles the shape and appearance of the upper jaw edge and backside of an actual mouth of a whale!
The term itself is very intuitive, based on appearance.
The striations in a real whale's mouth are the baleen, which filters out fish and shrimp the whale feeds on. With a gust front, the scud tags and striations on the backside surface of the shelf cloud sometimes resemble this.
I am not sure who termed the name "Whale's Mouth" originally, maybe one of the first chasers? Jensen? Hoadley? Not sure.
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