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Recent observed changes in weather types over Spain

A joint probabilistic analysis of Weather Types and daily observations has been performed, in order to
study and analyse changes in the meteorological phenomena and the atmospheric circulation over Spain
during two recent periods of time; 1957-1979 and 1980-2002. To do so, we have generated a cluster of
100 Weather Types from the ERA-40 reanalysis data using a k-means algorithm. Results show changes
in daily meteorological observations, as well as changes in the frequency of appearance of Weather
Types and in the occurrence probability of different events.