ヒュー
also: ヒュウ · ヒューッ · ヒュウッ
Usage patterns
風がヒューと鳴るfor the wind to whistle with a hyuu sound
Outside, the wind was whistling.
〈物〉がヒューと飛ぶfor something to whiz through the air with a hyuu sound
The ball whizzed right over my head.
ヒューと口笛を吹くto whistle with a hyuu sound
He whistled to call out to her.