It was used data from the LBA (Large-Scale Biosphere-Atmosphere in the Amazonian) for the state of Rondônia, North area of Brazil at district of Ji Paraná at Lat. 10° 76’ S, Long. 062° 36’ W and Alt. 292 m, place of the experiment, in the Southwest of the Amazonian, accomplished for the 17/10/2002. Study case meteorological data of surface and altitude were collected as pressure, temperature of the atmosphere, satellite images and radiosonde. The frontal system that reached the area of the experiment on the 17/10/2002 favored the formation of convective clouds, variation of the temperature and relative humidity and a strong precipitation, in a short duration. The indexes of instability of the surveys of 1800UTC and 2100UTC showed, in advance, the probability of occurrence of Mesoscale Convective Complex. Images of satellite showed, with clarity, the front system on the area, 10 minutes before the precipitation event, that happened between 16:30 and 17:10 local time, with a total of 31,4 mm happened bursts of winds of 3,6 hPa. Between 16:00 and 16:40 local time, the width of the temperature was of 8,9 °C, finishing with cooling. That showed the atmospheric dynamics of the area in study (at Ji Paraná district) the action of a front system, in the formation of Mesoscale Convective Complex.
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