The fair weather variety of waterspout is much more common than the tornadic."Ī number of tornadoes hit the tri-state area on Thursday evening in Pennsylvania and New Jersey. They are usually small, relatively brief, and less dangerous. They can be large and are capable of considerable destruction. They develop at the surface of the water and climb skyward in association with warm water temperatures and high humidity in the lowest several thousand feet of the atmosphere. Tornadic waterspouts generally begin as true tornadoes over land in association with a thunderstorm, and then move out over the water. Fair weather waterspouts, on the other hand, form only over open water. Tornadic waterspouts generally begin as true tornadoes over land in association with a thunderstorm, and then move out over the water. The fact is, depending on how they form, waterspouts come in two types: tornadic and fair weather. A tornado begins over land, while a tornadic waterspout develops over water or moves from the land. The main difference is in where they form. ![]() ![]() "The belief that a waterspout is nothing more than a tornado over water is only partially true. To start, they are both columns of rotating air. According to a post on, a waterspout is defined by the National Oceanic and Atmospheric Administration (NOAA) as "funnel which contains an intense vortex, sometimes destructive, of small horizontal extent and which occurs over a body of water." 'Tornadic waterspouts', also accurately referred to as 'tornadoes over water', are formed from mesocyclones in a manner essentially identical to land-based tornadoes in connection with severe thunderstorms, but simply occurring over water.
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