You may say 'kurai kaze,' written: 暗い風
kaze
spirit wind
Azaki
kuraihana
kuraitaiyo
kuraikokoro
ダークデーモン
kaze no haKaze no miwaku
kaze joutei
You may say 'kaze no koe,' written in Japanese: 風の声
The phrase 'dark storm' would be 暗い嵐 (kurai arashi) in Japanese.
kurai mori