characterized by dark/dense clouds and strong winds, usually combined with rain/snow, thunder, and lightening, or relating to or resembling such weather conditions;
e.g. It was a dark and stormy night. The sky was filled with stormy clouds.
(adjective)
characterized by disturbance in the form of violent outbursts of emotion, especially anger/fury;
e.g. After a stormy discussion, they decided to end their agreement.