| We review an intense and heavy impact storm that occurred over Calabria,
southern Italy, during the 11 and 12 December 2003. The event
is traced back, at synoptic and planetary scales, up to 5 December
2003 by National Centre for Environmental Prediction/National Centre for
Atmospheric Research (NCEP/NCAR) reanalysis fields and backtrajectories.
The role of tropical storm Odette is clearly shown as well as that of the
Azores high. Even if non negligible water vapour sources are expected from
the Mediterranean sea, unusually large precipitable water was present over
the Atlantic mid-latitudes. It is shown that tropical storm Odette
determined large evaporation from Atlantic Tropics and the cooperative
action of synoptic scale and planetary scale pressure centres focused this
humidity into a plume and conveyed it into the Mediterranean area. |