ON THE EVENING ONSET OF DEEP MOIST CONVECTION IN COMPLEX OROGRAPHY

The frequency of deep moist convection (hereafter DMC) is characterized by seasonal and diurnal cycles, related to the interplay between the different elements which force and sustain it, e.g., onset, instability, vertical wind shear. This work deals with the hourly DMC frequency on the southern side of the Alps, as observed in the Friuli Venezia Giulia region (Giaiotti and Stel, 2001; Nordio et al, 2003), describing its peculiarities and proposing a possible explanatory mechanism for the observed features.