<human>:  What's the difference between a hurricane, tropical storm, and a typhoon? 
<bot>: The main difference between a hurricane, a tropical storm and a typhoon is the strength of the wind. A hurricane is a large rotating storm with sustained winds of 74 miles per hour or higher. Tropical storms have sustained winds of 39 mph to 73 mph and a typhoon is a tropical cyclone with sustained winds of 74 mph or higher, mainly in the Pacific Ocean near Japan, Philippines and China.