BBC - Weather Centre - WeatherWise


Depression:	A low-pressure weather system; a "low". Also called a cyclone.
Desert:	An area, either hot or cold, where the annual precipitation is less than 25 cm (10 in).
Dew:	Liquid water that has condensed on to objects at or near the Earth's surface.
Dew Point:	The temperature at which water starts to condense out of a particular air mass.
Downburst:	A strong downdraught of short duration produced by some thunderstorms.
Downdraught:	An air current that is moving vertically downwards.
Drizzle:	Light rain with drops smaller than 0.5 mm (0.02 in).
Drought:	Prolonged and abnormal shortage of water caused by lack of rainfall.
Dust Bowl:	Area in the Great Plains region of the USA where soil erosion occurred during 1930-31 as the result of prolonged drought.

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