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At the time when ECMWF was founded, it was
estimated that medium-range weather forecasts would lead to large
economic gains for society. Currently, forecasts are, on average,
synoptically useful for up to a week or more, with extreme weather
events generally forecast three to four days in advance.
Nevertheless, medium-range forecast information is not always used
to its full potential; when decisions on the protective action to
be taken against extreme weather are made, medium-range forecasts
too often serve only as background information.
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