storm whirlwind
颮 centers on a violent, rotating wind: a storm whirlwind or sudden gust that spins and strikes.
颮 combines 風 (wind) with 包, which likely contributes the sound and the idea of wrapping or enclosing, suggesting a wind that coils or whirls.
The wind enclosure 風 wraps around 包, like a storm wrapping itself into a tight whirlwind. Picture a spinning column of wind trapped inside a container.
For ヒョウ, imagine a whirlwind howling like a hyena: hyena -> ヒョウ, and the storm spins with that wild sound.