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The aim of this paper was to study the time detection for the arrival and initiation of Siberian high pressure activities in southern coast of the Caspian Sea. Therefore, the temperature and pressure data were collected from Anzali, Babolsar and Gorgan stations for the September, October, November and December months during the statistical periods of 1971 to 1980. The criteria for Siberian high pressure current were the presence of the ridge system with the isobar line of minimum 1020hp. in southern coasts of Caspian Sea, along with the establishment of a Siberian high pressure core cell in the eastern longitude of 60○ to 120○ and northern latitude of 40○ to 60○ in the region. Whenever the changes in temperature and pressure of stations occurred simultaneously by a penetration of Siberian high pressure ridge on the region , the time had been registered as the arrival time of Siberian high pressure to the southern coasts of Caspian Sea. Accordingly, the second decade of October (third decade of Mehr) was recognized as the initiative stage of Siberian high pressure activities in the region with the highest frequency of 50% during the statistical period.

Keywords: Time detection, Siberian high pressure, Southern coasts of Caspian Sea, Synoptic Pattern

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