ARPA - Agenzia Regionale per la Protezione dell'Ambiente - Italy
OSMER - Osservatorio Meteorologico Regionale - Italy
The Lifted Parcel Theory is a simple method for evaluating the instability of a sounding and computing a number of instability indices, for forecasting convective events. Very different results are obtained depending on the the choice of the initial parcel to lift and on the method used to evaluate the buoyancy (e.g. using the virtual or cloud-virtual temperature).
A new method, retaining the condensed water in the rising parcel and freezing it continuously, is investigated. For each of the three methods implemented the coherent adiabatic processes are applied and finally the different results are compared.