USCG Meteorology Practice Exam

When a tornado moves over the water from land, it is termed a waterspout. This phenomenon occurs when a tornado forms over a body of water and is characterized by the same intense wind and rotating column of air that make tornadoes dangerous on land. Waterspouts can vary in intensity, from minor, weak forms to much stronger, more hazardous types associated with severe weather.

Understanding the nature of this term is crucial because a waterspout is distinctly different from the other types of weather phenomena listed. For example, a whirlwind generally refers to a non-tornadic column of air, lacking the destructive characteristics of a tornado. A hurricane is a large storm system that forms in tropical waters and involves organized wind patterns over significant areas, while a tropical cyclone encompasses similar storm systems but isn't specific to the characteristics of tornadic activity or movement over water. Thus, the correct terminology for a tornado occurring over water is waterspout, effectively reflecting its origin and behavior.