Waterspout formation typically occurs when cold air moves across the Great Lakes and results in large temperature differences between the warm water and the overriding cold air. They tend to last from about two to twenty minutes, and move along at speeds of 10 to 15 knots.

Are waterspouts dangerous?

Waterspouts have long been recognized as serious marine hazards. ... Incidents of waterspouts causing severe damage and casualties are rare. However, there have been several notable examples. The Malta tornado in 1555 was the earliest record of a deadly waterspout.

Can a waterspout go on land?

“Fair weather waterspouts usually dissipate before hitting land because they really depend on warm water,” Carpenter said. “But they can hit land, so you should be cautious if you see one.” How fast do they move? Carpenter said fair weather waterspouts require light wind, so they move slowly.