Abstract
Blockings are atmospheric phenomena occurring especially in midlatitudes with duration ranging from a few days, reaching remain active for weeks. During the occurrence of an atmospheric blocking, a persistent high pressure anomaly, located south of the belt of semi-permanent subtropical high, preventing the advance systems in their normal course arises. To detect these events proposed by Pelly e Hoskins (2003) (PH03) index was used. This index detect the reversal meridional gradient of potential temperature on the dynamic tropopause (high levels) caused by persistent abnormal movement. The situation must remain active for more than three consecutive days and be present in greater than 10° of longitude area. The index is calculated for the period from 1986 winter, moreover, analysis of meteorological fields that characterize its synoptic conditions is made. The blockade remained active in the region for several days between the end of July and early August. The results were satisfactory so that the field of meteorological analysis showed the property of blocking condition showing the functionality of the PH03 index.
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