Funnel Cloud
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Water spout filmed over Lough Neagh in Northern Ireland

Staff at Belfast International Airport witnessed a water spout forming over Lough Neagh on Tuesday evening.

A funnel cloud usually forms during a thunderstorm or heavy shower, from a cumulonimbus cloud or a large cumulus cloud, when the atmosphere is unstable.

It consists of condensed water droplets and is associated with a column of air that rotates as it is drawn into the cloud.

If a funnel cloud touches the ground it is generally regarded as a tornado and could lift debris and even cause some minor damage on the ground - depending on the strength of convection within the cloud.

However, if the funnel cloud touches down at sea we get what is known as a waterspout.

Go to next video: Rare aerial footage of waterspout