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The extratropical cyclones are associates to frontals systems and air temperatures gradients at troposphere. The aim of this work  was relate the  effect of these cyclones in increase of salinity in the stream of access to Patos Lagoon. A climatologic analysis of extratropical cyclones that moved for northeast/east near to the coast of Rio Grande do Sul State, in two distinct periods: May 2006 to march 2007 and May 2007 to March 2008. The first one corresponds to an El Niño period and the second one  to  a  La  Niña  period.  This  analysis  was made  through  the satellite  GOES-E  images  and  for  the  surface synoptic maps available by CPTEC. The salinity data had been collected daily in the stream. The cyclogenesis during La Niña was bigger than El Niño, however in El Niño period they had been more representative in the climatic change in the region, mainly in increase of the south wind intensity, that pushes saline water for inside of the estuary, so had more than increase in the salinity caused by the  south  wind  during  this  period.  However  exists,  the  significant relationship  between  the  extratropical cyclones  of  and  the increase of salinity in the estuary of Patos LagoonOs ciclones extratropicais estão associados à sistemas frontais e gradientes de temperatura do ar na troposfera. O objetivo foi relacionar o efeito dos ciclones extratropicais no aumento da salinidade no canal de acesso à lagoa. Foi feita uma análise dos ciclones extratropicais que se movem na direção nordeste / leste, ao longo da costa do Rio Grande do Sul, em dois períodos distintos: Maio de 2006-Março de 2007 e maio de 2007 a março de 2008. O primeiro corresponde a um período de El Niño e o segundo  de  La Niña.  Esta  análise  foi  realizada  com  as  imagens do  satélite  GOES-E  e  com mapas  sinóticos  de  superfície fornecidos pelo CPTEC. Os dados de salinidade foram coletados diariamente no canal. Os ciclones extratropicais ocorreram, em maior número, durante a La Niña, mas durante El Niño foram dominantes na mudança do clima na região, principalmente no  aumento  da  intensidade  do  vento  sul,  o  que  empurra  a  água  salgada  para  o  estuário.  Portanto,  existe  uma  relação significativa entre a passagem de ciclones extratropicais no Atlântico Sul e o aumento da salinidade no estuário da Lagoa dos Pato

INFLUENCE ANALYSIS OF EXTRATROPICAL CYCLONES IN INCREASE OF SALINITY AT THE ESTUARY OF PATOS LAGOON, SOUTHERN BRAZIL