On the 4th of November 1966, Venice suffered its most dramatic flood event. The storm and the associated flood were poorly forecast. In this paper we discuss if this was due to a lack of data or of suitable numerical modelling. Considering also a second severe storm, happened on the 22nd of December 1979, we have used the present meteorological and oceanographic models issuing a posteriori forecasts using the meteorological data available at the time. The results show that with the present tools both the storms and the associated wave and surge conditions could have been forecast since several days in advance. We discuss the possible generalisation of this result to less intense, more common, storms.
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