We just learned about a Category 3 Hurricane.
The next level is a Category 4 Hurricane - Catastrophic damage will occur.
These hurricanes have wind speeds between 130 and 156 mph.
This kind of hurricane can totally knock over a house, rip up and snap most trees, flood very far inland, and cause power and water losses for weeks.

(from: wikipedia - hurricane gustav)
Kid Facts - Blast from the past: Snowflake