ABSTRACT The aim of this study is the synoptic analysis of the atmospheric
conditions concurrent with the heavy precipitations of Lorestan, Fars and
Hormozgan provinces and determination of the temporal and spatial distribution
of them. Requested atmospheric data for this research was taken from databases
related to the National Organization of Atmosphere and Oceanology of United
States. More maps of the site were taken. Then the earth surface, 500,700 and
850 Hecto Pascal maps, orbital and meridional winds, earth temperature of earth
surface and top of the atmosphere were prepared in Grads software and some of
maps were drawn in GIS software. The following results were obtained: On the earth
surface map, the main controller role is with the Siberian high-pressure, the
Azores’s dynamic high-pressure and integrated mode of the Sudan and the Mediterranean
low-pressure systems. The main controller role in high levels is with the high
altitude center of Azores in the back of the system, the high altitude center
of Arabia in the front of the system and deep traffic of North Africa. Another
important factor is the moisture mixture of Mediterranean Sea, Red Sea, Persian
Gulf, Oman Sea and Indian Ocean. Air rise factor with enhancing meridional winds
that causes subsidence of cold air, rising warm air and strengthening the polar
front is one of the heavy rainfall conditions too. Eastern winds cause entering
of moisture from the Indian Ocean and western winds cause strengthening of
cyclones and heavy rainfall in the region.
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