Genoves, A. (Instituto Nacional de Meteorologia, Palma de Mallorca, Spain)
Jansa, A. (same affiliation)
Estarellas, C. (same affiliation)
A data base of Mediterranean surface cyclones, based on mesoscale hand analysis, has been archieved since 1992, in the Meteorological Center of the Balearics.
The first results obtained from a simple view of the information contained in the subjective catalogue, and published in the PEMMOC Bulletin, are confirming in a qualitative way the importance of the orography in locating cyclogenesis in our zone.
We have begun a study directed to the systematic determination of the relative importance of the orography and the PV advection from high levels, as factors of the Mediterranean cyclogenesis, by using the archived output fields of the old model LAM-INM-0.91. In the work now presented, the 'orographic factor' in producing the 'subjective' surface cyclones, for the period 1992-95, is quantified from computation of a windward/lee magnitude, L=V7.grad(h), V7=wind vector at 700 hPa, h=height of the terrain. A close time/space coincidence between significant negative values of L with cyclonic presence will mean a large weight of the orographic factor.