Understanding Waterspouts: Formation, Types, and Key Characteristics

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Key takeaways

A rare waterspout was recently observed over the Brahmaputra River in Assam's Barpeta district.
Waterspouts typically have a short lifespan lasting between 5 and 20 minutes before dissipating.
While fair-weather waterspouts are milder, tornadic waterspouts can reach wind speeds exceeding 100 km/h.
The spinning funnel is primarily made of condensed water vapor rather than liquid water drawn from the river or ocean.

A rare rotating column of water called a waterspout was recently spotted over the Brahmaputra River in Assam's Barpeta district.

A waterspout is a strong spinning column composed of air and condensed water vapor.
It forms over bodies of water like oceans, lakes, or large rivers, connecting the water surface to clouds above.

Fair Weather Waterspouts develop during calm weather along the flat base of growing clouds, starting at the water surface and building upward without severe storms.
Tornadic Waterspouts are actual tornadoes over water that grow downward from severe thunderstorms and bring dangerous winds, hail, and intense lightning.

Warm surface water heats the air above it, generating a rising air column where shifting winds trigger a rotating vortex.
Inward spinning air creates a distinct dark spot on the water surface, marking the start of a low pressure core.
Rising updrafts stretch the rotating core vertically, dropping internal pressure and condensing moisture into a visible funnel cloud.
The spinning mist column reaches full strength with a spray ring at the base, but ground friction and loss of warm moisture cause it to decay upon hitting land.

Waterspouts usually last between 5 and 20 minutes and form in small, unpredictable locations.
Their wind speeds are generally lower than land tornadoes, but tornadic versions can exceed dangerous speeds of 100 km/h.
The visible funnel consists mainly of condensed water vapor rather than large amounts of liquid water pulled from the river or sea.
Fair weather waterspouts quickly weaken and collapse when moving onto land due to ground friction and loss of warm water moisture.