Fig. 1

Polar diagrams of wind direction and intensity recorded at the Brindisi station (Aeronautica Militare), about 300 km from Vesuvius, in the period between 1962 and 1976. In the analysis we consider data in the period between 1962 and 1976 (3125 records). Please note that, differently from the convention usually adopted in meteorology, these plots do not represent the direction of provenance of the wind, but the direction towards which the wind blows