The hot deserts are generally located in tropical and sub-tropical zones between 15° and 30° north and south of the equator. Most hot deserts lie on the western side of great continents, near cold ocean currents.
Hot deserts are very dry with an anual rainfall of 0-250 mm. Rainfall is rare, infrequent, unpredictable and heavy rainfalls can cause flash floods.
Hot deserts are so dry because they lie in high pressure belts that lie between 30° north and south of the equator where warm air holds water vapour. Most deserts lie in the path of the trade winds. The trade winds absorb moisture rather than emit moisture. Cold ocean currents on the western seas absorbs the moisture-laden winds in the form of fog as they blow towards the desert.
Main hot deserts