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Title

A SYNOPTIC PATTERN ANALYSES OF 20TH OCTOBER 2003 FLOOD IN MAZANDARAN AND GILAN PROVINCE

Writers

AZIZI GHASEM | SAMADI ZAHRA

Pages

 Start Page 61 | End Page 74

Abstract

 This paper analyzes the spatial and SYNOPTIC PATTERNs of the 20th October 2003 FLOOD in the 'Mazandaran and Gilan provinces using the air maps and hourly meteorological data. In this way we consider geographic conditions and physical characteristics of the southern coastal areas of the CASPIAN SEA and using daily and hourly (3 hours interval) data of each synoptic station. Duringa 8 daysperiod (14th- 21th October 2003) the SYNOPTIC PATTERNs arrangement and their displacements were investigated in the air maps include surface, 850, 700 and 500 Hectopascal levels. The result show that present of a deep trough in the northeast of Europe and it's axis orientation on the CASPIAN SEA have been cause to polar air (C.P) advection from northern-latitudes on it. Also it has been amplified by present of a transition anti-cyclone with northwest-south orientation in the west of the trough and frontal cyclone in the east of the trough and because of to have a similar orientation between western anti-cyclone rotation and eastern part of the ahead trough cyclone. On the other hand vorticity has been amplified by considerable meridional motion of the middle level troposphere flows. Simultaneity with these factors and also intensification of maximum temperature difference between the polar cold air and CASPIAN SEA water in this season are factors that causing the mentioned intense rainfall.

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