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Bermuda Triangle

Overview page. Subjects: Maritime History — Warfare and Defence.

An area of the western Atlantic Ocean where a large number of ships and aircraft are said to have mysteriously disappeared; the name is recorded from the 1960s.

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congestus

Overview page. Subjects: Meteorology and Climatology.

From the Latin congestus meaning ‘piled up’, a species of cumulus cloud with deep bulging form and an upper part having a cauliflower-like appearance. See also cloud classification.

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funnel cloud

Overview page. Subjects: Earth Sciences and Geography — Ecology and Conservation.

A narrow, conical cloud that appears from the base of large cumulonimbus the central part of which is rotating (forming a mesocyclone). The funnel cloud is a vortex formed by air spiralling...

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gustnado

Overview page. Subjects: Meteorology and Climatology.

A North American term for a relatively weak, short-lived whirl that is initiated by strong downdraughts on a thunderstorm's gust front. It does not produce a condensation funnel. Such...

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landspout

Overview page. Subjects: Meteorology and Climatology — Environmental Science.

A violently rotating column of air (like a small weak tornado but not formed by a storm‐scale rotation) which is sometimes seen beneath cumulonimbus or towering cumulus clouds; the land...

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Mary Celeste

Overview page. Subjects: Maritime History.

A hermaphrodite brig of some 280 tons found abandoned in the Atlantic in November 1872. How she came to be in that condition remains one of the great mysteries of the sea.

She...

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Tornado

Overview page. Subjects: Meteorology and Climatology.

1 A form of thundery squall encountered in West Africa, particularly around the Gulf of Guinea. It often occurs as a line squall, and is especially frequent at the beginning...

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tuba

Overview page. Subjects: Meteorology and Climatology.

From the Latin tuba meaning ‘trumpet’, a supplementary cloud feature of cumulonimbus or sometimes cumulus, characterized by a column or cone of cloud projecting from the cloud base. See...

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updraught

Overview page. Subjects: Meteorology and Climatology.

An ascending current of air occurring in a relatively restricted region of a cumulonimbus cloud, multicell or supercell storm, tropical cyclone, or similar system. Updraughts originate when...

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whirl

Overview page. Subjects: Meteorology and Climatology.

1 A general term for various forms of rapidly rotating vortex, covering a wide range of strengths and wind speeds, including devils, gustnadoes, landspouts, tornadoes, and...

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whirlwind

Overview page. Subjects: Earth Sciences and Geography.

A spiral wind storm around a low-pressure centre. In arid areas dust may be carried upward several hundred metres.

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