Page "Tornado" Paragraph 45
from
Wikipedia
Fair weather waterspouts are less severe but far more common, and are similar to dust devils and landspouts.
They form over water similarly to mesocyclonic tornadoes, or are stronger tornadoes which cross over water.
Since they form from severe thunderstorms and can be far more intense, faster, and longer-lived than fair weather waterspouts, they are more dangerous.
In official tornado statistics, waterspouts are generally not counted unless they impact land, though some European weather agencies count waterspouts and tornadoes together.
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