Assimilation produces a convenient, comprehensive, high - resolution, representation of he atmosphere.it has been clearly
demonstrated that the use of a computer model is usually better (i.e. leads to better forecasts) than the subjective human
approach. The main practical use of these assimilated "analyses" is for initialising numerical weather prediction (NWP) forecasts. They are also useful for climate and general circulation studies, for instance in the calculations of fluxes, which make use of their high resolution and comprehensive coverage. However it must be remembered that the blend of observed and modelled information will vary according to the accuracy and coverage of the observations. So they must be used with great care for model validation, and climate change detection.