The equatorial region of calm or light variable winds between the northern and southern trade wind belts, also known as the Intertropical Convergence Zone (ITCZ). The doldrums are characterised by hot, humid conditions with frequent heavy rain squalls and thunderstorms, and were historically dreaded by sailing vessels for their unpredictable and often windless conditions.
Category: Weather & Sea Conditions
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Beaufort ScaleA scale of wind force ranging from 0 (calm) to 12 (hurricane force) developed by Rear Admiral Sir Francis Beaufort in 1805.CycloneA general term for a tropical cyclone occurring in the South Pacific or Indian Ocean, characterised by an organised system of clouds and thunderstorms with a defined low-pressure centre and sustained winds of 64 knots or greater.FetchThe uninterrupted distance of open water over which wind blows in a constant direction, directly affecting the size and energy of waves generated.HurricaneA mature tropical cyclone that develops in the North Atlantic or eastern North Pacific Ocean, characterised by sustained wind speeds of 64 knots or greater.MonsoonA seasonal prevailing wind in the Indian Ocean and southern Asia that brings heavy rainfall during summer months.Neap TideThe tide with the smallest range between high and low water, occurring approximately every two weeks when the sun and moon are at right angles relative to the earth during first and third quarter moon phases.
Back to DictionaryEntry updated May 2026