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Weather Education

What Is A Waterspout? (Credit: NOAA National Ocean Services and NWS)

11/30/2018

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Picture
Picture this: you’re on vacation in the Florida Keys enjoying the warm, humid weather at the beach, when all of a sudden you notice what looks like a tornado on the water. What you have just witnessed is a phenomenon known as a waterspout. Waterspouts typically occur in the tropics and subtropics, but can also occur in other areas such as the Great Lakes. But what exactly is a waterspout?

A waterspout is a column of spinning air, or a vortex, that occurs over water. There are two different categories of waterspouts: tornadic and non-tornadic. Tornadic waterspouts form in the same way as a tornado that would form over land and are associated with severe thunderstorms. The primary difference between a tornado and a tornadic waterspout is that a tornadic waterspout occurs over water. This can refer either to tornadoes that form over water or tornadoes that form over land and then move over water. 

Non-tornadic waterspouts are not formed in severe thunderstorms, and are often referred to as fair-weather waterspouts as they are associated with developing cumulus towers. Non-tornadic waterspouts typically move very slowly, if they move at all, since the clouds they are associated with are developing through vertical convective action rather than through the collision of moving frontal boundaries. Non-tornadic waterspouts go through five stages of development. The first is the appearance of a light-colored disk surrounded by a larger, darker colored area on the water. The second stage of development is characterized by a spiral pattern of light and dark bands outside of the dark spot on the water. A swirling ring of sea spray, called a cascade, then develops around the dark spot. As the waterspout continues to develop, it will form a visible funnel that extends between the water’s surface and the dark flat base of the developing cumulus cloud. The final stage of a waterspout’s life cycle occurs when the inflow of warm air into the vortex of the waterspout weakens causing the waterspout to dissipate.

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©2018 Meteorologist Stephanie Edwards
 
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  • Home
  • About
    • GWCC Is
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    • Contact Us
  • Global Regions
    • Africa
    • Atlantic Ocean and Caribbean Sea
    • Central and Eastern Pacific Ocean
    • Central and South America
    • Europe
    • North America
    • Indian Ocean and Asia
    • Polar Regions
    • South Pacific Ocean and Australia
    • Western Pacific Ocean
  • Weather
    • Applied Meteorology >
      • Air Quality
      • Aviation
      • Droughts
      • Fire Weather
      • Flooding
      • Geosciences
      • Global Environmental Topics
      • Weather Observations
    • Weather Education
    • Weather History
    • Weather Research
    • Weather Safety and Preparedness
    • Severe Weather
    • Social Sciences
    • Space Weather
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    • Weather and Health
    • Winter Weather
  • Climate
  • GWCC Global Imagery Archive
  • GWCC Window to the World
    • GOES-16 Live Satellite Imagery Portal
    • GOES-16 ABI Channel Description and Examples
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    • GOES-17 Live Satellite Imagery Portal
    • Himawari-8 Live Satellite Imagery Portal
    • Meteosat-11 Live Satellite Imagery Portal
  • Kids Corner
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