REGIONALIZAÇÃO SAZONAL E MENSAL DA PRECIPITAÇÃO PLUVIAL MÁXIMA NO ESTADO DO RIO GRANDE DO SUL

This work aims to characterize the rainfall and to identify atmospheric systems that act in the Rio Grande do Sul State. Monthly data from the period between 1967 and 1998 were used, sampled at the 14 meteorological stations. The time-spacial rainfall behavior were analised by the seasonal and monthly variability. Total mean values were calculated for each meteorological stations. Further, data analisys and interpretation were realized on the rainfall (seasonal and monthly). Seasonal, data for the costal and central state, show that winter months are more rainny, due to the frequency of the frontal systems passage. At the southwest, auttumn is more rainny, due to atmospherical blocking. At the northwest, spring months are more rainny, due to Mesoscale Convective Complex formation. At the northeast, summer is more rainny, is a function of convective rain associated to atmospheric system like the South Atlantic Convergence Zone.