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Este estudo se propoe realizar uma analise observacional dos sistemas convectivos de mesoescala circular (MCSC), visando identificar como as diferentes caracteristicas da superficie interferem na genese destes sistemas. Para alcancar este objetivo, a Amazonia oriental foi divida em quatro regioes distintas: regiao A (nordeste), regiao B (sudeste), regiao C (sudoeste), regiao D (noroeste), onde, com o uso de dados de sensoriamento remoto, foram selecionados os eventos e calculado a excentricidade, tamanho, tempo de vida e o horario preferencial de surgimento dos MCSC. Os resultados mostraram que as regioes A e D concentraram 66% da ocorrencia de MCSC. O horario preferencial, de formacao dos sistemas, sofre variacao de acordo com as caracteristicas da superficie local. Na regiao litorânea, os sistemas tendem a se formar no meio da tarde, com pico maximo no inicio da noite. Nas regioes mais distantes do litoral e de topografia elevada, os MCSC tendem a se formar no final da tarde com pico maximo no inicio da madrugada, foi observado como a topografia da regiao litorânea favorece a formacao de sistemas convectivos. Contudo, o fator comum encontrado em todas as regioes foi a preferencia dos sistemas pelas zonas de transicao entre vegetacao e areas desmatadas, principalmente ao longo da regiao do Arco do Desmatamento. A B S T R A C T This study proposes to conduct an observational analysis of circular mesoscale convective systems ( MCSC ), to identify how the different surface characteristics influence the genesis of these systems. To accomplish this, the eastern Amazon was divided into four distinct regions: region A (northeast), region B (southeast) region C (southwest), D region (northwest), where, with the use of satellite images, the FORTRACC application and data technical CMORPH, we selected the events and calculated the eccentricity, size, lifespan and the preferred time of genesis of MCSC . The results showed that regions A and D concentrated the 66% occurrence of MCSC. The preferred moment of formation of the systems suffers variation according to the local characteristics of the surface. In the coastal region, the systems tend to form in the middle of the afternoon, with maximum peak in the early evening. In the regions more distant of coastal and of high topography, the MCSC tend to form in the late afternoon with peak early in the morning. However, the common factor found in all regions was the preference of systems by transition zones between vegetation and cleared areas, especially along the Arc of Deforestation region. Keywords: Mesoscale Convective System Circular, Topography, Eastern Amazon.

ESTUDO OBSERVACIONAL DA CONVECÇÃO DE MESOESCALA EM DIFERENTES SUPERFÍCIES NO ESTADO DO PARÁ (Study of mesoscale convection in different areas in Pará state)