Relações entre Índices de Instabilidade e as chuvas ocorridas em Porto Alegre,RS,de 1990 a 2005

Abstract

The general aim of this paper is to verify the statistical relations of instability rates with the total amount of precipitation ocurred in value bands,in order to determine the reliability of each of the instabilities rates studied since precipitation acts directly in agriculture,clothing and planning of events and parties,leading the study of such variable to be widely explored,so that there is a greater understanding,and then a great planning about the above-mentioned examples and many others.The precipitaion,as well as its form,is associated with the characteristics of instability of the atmosphere,this meteorological variable is determined through studies of the superior atmosphere configuration,using data from aerological soundings.Such information is collected by superior air stations existing in few localities in Brazil.In the research proposed it was used only instability rates which include mathematical equations supported by values of atmospheric variables obtained of aerological soundings.In the execution of this study it will be used precipitation daily data from the meteorological station of orto Alegre,pertaining to the 8 th district of meteorology of the Nacional Institute of Meteorology INMET,from the Ministry of agriclture, cattle and supplying -MAPA,and also daily data of instability rates obtained through atmospheric soundings carried out in the meteorological station of superior air at the international airport Salgado Filho in Porto Alegre.The period of this data was from 1990 to 2005.It was verified that the indexes of instability when related separately with the rain they did not present good results.But,all together ones,got better plenty the relationships with the rains.