Resumen
From the visible satellite pictures of summer we have analized the variability of the southeast border of the Californian stratus cover. From the combination of the positions of the borders three cases are obtained: The borders towards the southwest, from south Baja California point, from Eugenia point and Conception point respectively. In summer the return point of the extreme northeast of this border is the Eugenia point. Shifting of stratus cover towards the north or west is associated with the presence of tropical storms or hurricanes which are near the southwest coast of Baja California, or also by the passage of an upper level trough. Also studies about this topic are reviewed.