human
What is the difference between a typhoon, a hurricane and a tornado?
assistant
The main difference between a typhoon, a hurricane, and a tornado is their size. Typhoons are tropical cyclones that form over warm ocean waters and have maximum sustained winds of at least 118 km/h (74 mph). Hurricanes are tropical cyclones with winds up to 157 km/h (98 mph) and are generally larger than typhoons. Tornadoes are typically smaller than hurricanes or typhoons, but can still cause significant damage when they occur in populated areas.