We just learned about Tropical Storms.
Another type of tropical cyclone is a hurricane.
For a tropical cyclone to be called a hurricane, it has to have winds over 74 miles per hour for over a minute.
Hurricanes are put into categories of 1 to 5 based on how strong they are.
There is a scale called the Saffir-Simpson Hurricane Wind Scale, which scientists use to tell which category number the hurricane is, based on how strong the wind is.
(from: wikipedia - saffir-simpson hurricane wind scale)
Kid Facts - Blast from the past: Anemometer