High resolution isentropic model applied to local weather forecasting/ Izentropski model visoke rezolucije primijenjen na lokalnu prognozu vremena

This paper is primarily devoted to general discussion of HRID (High resolution isentropic diagnosis) model developed by Glasnovic (1983) and its vertical time cross-sections used operationally on direct output of forecasting model ALADIN (Aire Limitee Adaptation Dynamique et Development International). HRID is based on polynomial hydrostatic adjustment technique making use of reciprocal value of thermal stability parameter and its higher order derivatives. Since these relations are applied in local points of vertical interpolation, the problem is considered analytically, eliminating the finite difference approximation procedure in layers with different isentropic thicknesses. This paper presents a local 72 hourly ALADIN/HRID forecast for the city of Split, Croatia, at the eastern Adriatic coast, with detailed vertical atmospheric structure indicating the characteristic features of a frontal passage on 2 January 2007. Keywords: ALADIN, HRID, objective analysis, vertical cross-sections Ovaj rad je najvecim dijelom posvecen diskusiji o izentropskom modelu visoke rezolucije HRID kojega je razvio Glasnovic (1983) i vremenskim vertikalnim presjecima koji se koriste operativno direktnim ukljucivanjem u prognosticki model ALADIN. HRID se zasniva na uspjesnoj primjeni rutine polinomskog hidrostatickog prilagodavanja, koja se temelji na reciprocnoj vrijednosti parametra termickog stabiliteta i njezinim derivacijama visega reda. S obzirom da se te relacije pri vertikalnoj interpolaciji primjenjuju lokalno, problem se rjesava analiticki i time eliminira izracun konacnih razlika u izentropskim slojevima razlicitih debljina. Rad prikazuje lokalnu 72-satnu prognozu za Split, pomocu vertikalnih vremenskih presjeka s detaljima vertikalne strukture atmosfere uz sve karakteristike koje prate prolazak frontalnog sustava 2. sijecnja 2007. Kljucne rijeci: ALADIN, HRID, objektivna analiza, vertikalni presjeci