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The Amazon Basin is dominated by convective rainfall, which has significant spatial and diurnal variations. In order to analyze the diurnal and seasonal distribution of convective events, as well as the thermodynamic analysis of some events, data on rainfall and cloud top temperature between January 2008 and December 2010 were used for the urban area of the city Belém-PA. 94 convective events were found, of which 59 are Deep Convective Events (DCE) and 34 are Shallow Convective Events (SCE). Most events occurred between 15 and 22 UTC, and 55% of them occurred in the rainy season. Daytime warming and sea breeze circulation play an important role in the occurrence of these events. The temperature profile showed a tendency to be higher when SCE occurred, mainly between the surface and approximately 850 hPa. The moisture profiles showed greater variability between 850 and 700 hPa, and the humidity was higher two hours before the rain and less after the rain. The zonal component of the wind showed significant shear from the surface to 850 hPa, being stronger in the three cases of DCE. The highest values of CAPE were observed about 2 to 3 hours before heavy rain, while the lowest values occurred in the hour of rain. Almost all SCE occurred when a meteorological system was present and the three cases of DCE occurred when there was a predominance of local convection. Therefore, the results presented in this paper might be relevant for modeling studies and for short-term forecast.
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