A rain waterspout is a whirling column of air and water mist.
While the term "rain waterspout" isn't a formal meteorological term, it likely refers to a waterspout occurring during rainy conditions. It's important to understand the two main types of waterspouts:
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Fair Weather Waterspouts: These generally form in calm waters and are usually less intense.
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Tornadic Waterspouts: These are essentially tornadoes that form over water or move from land to water and can be quite dangerous, just like tornadoes. They are also a whirling column of air and water mist.
Therefore, regardless of the specific type, a waterspout occurring during rain would still be characterized by the rotating column of air and water spray. In fact, they can be just as dangerous as tornadoes.