Typhoons, hurricanes, and tropical cyclones are all names for similar tropical storms that form over warm ocean waters and have wind speeds over 74 mph. Typhoons specifically occur in the western Pacific Ocean while hurricanes occur in the Atlantic Ocean and eastern Pacific. Both cause damage from high winds, rain, storm surge and can spawn tornadoes. Tsunamis are large ocean waves caused by earthquakes, volcanic eruptions or landslides under the sea which can reach heights of 100 feet and devastate coastal areas with flooding and destruction when the waves reach land.