whirlwind
飆 centers on a violent, spiraling wind: a whirlwind or sudden gust that spins fiercely.
飆 combines 風 (wind) with 猋, which likely contributes both sound and the idea of rapid, dog-like movement, suggesting a wind that moves swiftly and violently like a pack of dogs.
The left side 猋 shows three dogs running wildly, and the right side 風 is wind. Picture a whirlwind stirred up by a pack of dogs racing in circles.
For ヒョウ, imagine a whirlwind howling like a hyena: hyena -> ヒョウ, and the spinning wind sounds like its wild cry.