USE OF WILLMOTTS INDEX OF AGREEMENT TO THE VALIDATION OF METEOROLOGICAL MODELS

An important aspect of the meteorological model development process is the evaluation of model performance. In this paper we made a discussi on about the estimations provided by the Willmott's index of agreement d(2) as compared to those predicted by other more usual statistical i ndicators. The results we present were obtained during the validation of a simple empirical relationship between cloud shade (CS) and point cloudiness (PC). 1740 pairs of monthly average values (CS, PC) from 29 weather stations in Romania were used. Generally, the index of agreem ent was found out to be in good concordance with the other indicators. However, some non-concordances were observed when a finer analysis wa s considered.