We just learned about the type of Tropical Cyclone called a Tropical Depression.
The next strongest type of Tropical Cyclone is called a Tropical Storm.
This is when there is a strong circular thunderstorm with winds over 39 miles per hour and under 73 miles per hour.
A tropical storm can blow off shingles, and the heavy rain can cause flooding.
(from: wikipedia - tropical storm allison)
Kid Facts - Blast from the past: Roll Clouds