On 03 October 2005 a mesospheric front was observed over São João do Cariri (7.4 degrees S, 36.5 degrees W,). This front propagates to the northeast and appeared in the airglow images in the west side of the observatory. By about one and a half hour later, it dissipated completely when the front crossed the local zenith. In ahead of the front, several ripples structures appeared during the dissipative process of the front.