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Abstract
Two series of barotropic forecasts have been computed from numerically analysed maps. The first series consists of 31 forecasts and the second one of 4.
Due to the fact that it is possible to obtain the forecasts directly from observed data, which are punched immediately after they are received, it is possible to save both time (3 à 4 hours) and personnel.
The reliability of these forecasts seem to be at least as good as forecasts computed from conventionally analysed maps.