What is Whirlwind?
Whirlwind is (noun) 1. an extremely strong wind that blows round and round very fast in the centre of an area of very low pressure Whirlwinds come in the summer months and cause a huge amount of damage. (NOTE: Another US term is twister.) 2. something which happens more quickly than usual They had a whirlwind romance, and got married on holiday.
source: Easier English, Student Dictionary Upper Intermediate Level