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... New high level wind data collected at the weather stations of the Aereonautica Militare data centres at Pratica di Mare (Rome) and Brindisi have been compiled to characterize the prevailing wind condition in the Somma-Vesuvius region. The common north-easterly dispersal directions of the Plinian eruptions are consistent with the distribution of ash by high-altitude winds from October to June. In contrast, the south-easterly trend of the AD 79 products appears to be anomalous, because the eruption is conventionally believed to have occurred on the 24th of August, when its southeast dispersive trend falls in a transitional period from the Summer to Autumnal wind regimes. In fact, the AD 79 tephra dispersive direction towards the southeast is not in agreement with the June–August high-altitude wind directions that are toward the west. This poses serious doubt about the date of the eruption and the mismatch raises the hypothesis that the eruption occurred in the Autumnal climatic period, when high-altitude winds were also blowing towards the southeast. New archaeological findings presented in this study definitively place the date of eruption in the Autumn, in good agreement with the prevailing high-altitude wind directions above Somma-Vesuvius.
