Hurricane strength levels are based on the amount of damage they cause. To make them easier to understand, follow this completely unscientific guide I made up:
Cat 1: Plane full of screaming toddlers
Cat 2: Motorcycle gang moves in next door
Cat 3: Killer Bees crossbreed with crows
Cat 4: Hail the size of Toyota Priuses
Cat 5: Army of Karens at a Black Friday sale