Noun

1. A violent windstorm of limited extent, as the tornado, characterized by an inward spiral motion of the air with an upward current in the center; a vortex of air. It usually has a rapid progressive motion.
2. A person or body of objects or events sweeping violently onward.

   The weeks leading up to the convention were a whirlwind of preparation and hurried activity.

   Once he got that new scooter he turned into a whirlwind and damaged all the flowers.

Adjective

1. Rapid and minimal: a whirlwind tour, a whirlwind guide.