According to the World Meteorological Organization's Commission for Atmospheric Sciences ( Mclnturff, 1978 ): a stratospheric warming can be said to be major if 10 mb or below the latitudinal mean temperature increases poleward from 60 degree latitude and an associated circulation reversal is observed ( that is, the prevailing mean westerly winds poleward of 60 latitude are succeeded by mean easterlies in the same area ).

According to the World Meteorological Organization Guide, " The principle of the heated psychrometer is that the water vapour content of an air mass does not change if it is heated.

According to the World Meteorological Organization, weather and climate-related extreme events, such as tornadoes, thunderstorms, storms, cyclones, floods and drought, account for nearly 75 per cent of all disasters.

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