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The EURAD Model has three clouds modules, the capabilities of which were tested by three simulation experiments, in the case of the Chernobyl (USSR) accident. The maps of the clouded cover and the precipitation predictions are compared. The NOAA module uses a radiometer that measures the solar and terrestrial radiation. The different spectral properties allow a multispectral representation of the clouds and therefore the possibility to distinguish ice and water clouds. These comparisons show the exactness of the parameterization of convective processes and the cloud water distribution but underline the bad results for the humidity. The satellite data and the precipitation observation must be taken into account for a better parameterization of the clouds.