2 The representativeness is unknown in the context of the observed quantity. unknown unknown Not applicable in the context of the observed quantity. inapplicable inapplicable Representativeness An area or volume less than 100 m horizontal extent (for example, evaporation). microscale (< 100 m) microscale Representativeness An area or volume of 3 km to 100 km horizontal extent (for example, thunderstorms, sea and mountain breezes). mesoscale (3 km .. < 100 km) mesoscale An area or volume of 100 m to 3 km horizontal extent (for example, air pollution, tornadoes). toposcale, local scale (100 m .. < 3 km) toposcale An area or volume of 100 km to 3000 km horizontal extent (for example, fronts, various cyclones, cloud clusters). large scale (100 km .. < 3000 km) largeScale 2019-11-21T09:15:50.644Z An area or volume of more than 3000 km horizontal extent (for example, long upper tropospheric waves). planetary scale (> 3000 km) planetaryScale An area (also known as 'catchment') having a common outlet for its surface runoff, in km2. drainage area drainageArea