PRECURSOR WEATHER CONDITIONS FOR HAIL-EVENT FORECASTING IN THE MOLDAVIA
VASILICĂ ISTRATE, LIVIU APOSTOL, FLORENTINA BĂRCĂCIANU, IULIAN IORDACHE, LUCIAN SFÎCĂ
ABSTRACT. Precursor Weather Conditions for Hail-Event Forecasting in the Moldavia. The present work analysed a statistically representative number of severe convective events which caused hail and material damage during 1990-2015. For these episodes heights of 0oC, -6oC, -10oC and -20oC isotherms were analyzed. In the layers between these four isotherms, the formation and growth of hailstones occur. The height of these isotherms in the period preceding hail is essential in weather forecast of this phenomenon. Lifted index values recorded before hail events are also correlated with height isotherms. The altitudinal differences between the height of -6oC and -20oC isotherm and freezing level which represents intervals of initiation and formation of hail are identified. Not at last the values of the meteorological indices used to forecast the potential formation and hail falling in extracarpathian Moldavia are presented in details.
Keywords: freezing level, isotherm hight, lifted index, hailstone