Santander Meteorology Group

A multidisciplinary approach for weather & climate

It is known that the observed variability of meteorological phenomena, at daily timescales, is due to changes in
the atmospheric state and, therefore, alterations in the observed phenomenology are just an effect of changes in
the atmospheric variability.
In this work we have compared daily surface observations of extreme temperatures, precipitation and snow
occurrence (from the AEMet’s network), in two different periods of time (1957-1979 and 1980-2002) in mainland
Spain and the Balearic Islands, so as to identify and analyze changes in the daily atmospheric variability. In order
to carry this out, a joint probabilistic analysis of Weather Types (WTs) and meteorological phenomena has been
made.
The results show that there are significant differences, between the two periods of study, for both, surface
observations and WTs’ behavior.