Monsoon is a very important meteorological phenomenon that affects a large part of the Indian Ocean every year. These effects sometimes extend to the seas and bays connected to this ocean, especially the Gulf of Oman, and have destructive effects on the economic activities of this area. Although the effects of monsoon on the coasts of Iran are much less than the coasts of the Arabian Sea, but local reports indicate that the monsoon usually affects two bays belonging to Iran, Chabahar Bay and sometimes Pazm Bay in the northeast of the Gulf of Oman. In this research, the monsoon phenomenon in the northwest of the Indian Ocean has been analyzed in order to investigate its effects on the waters of the Gulf of Oman. One of the important results of this study is the extraction of Monsoon Line. In this study, the monsoon line is defined as the boundary line of the monsoon. This line, if we call it the Monsoon line, indirectly connects Ras Al-Had to the west of Chabahar Bay and sometimes also includes Pazm Bay.

The objective of the paper is to present the dependence of the wind profile of a monsoon on the depth of the layer, the ground surface roughness length, and the atmospheric stability. The paper also indicates that the wind profiles of the typhoon are composed of two layers, the upper one with the nearly constant velocity and the lower one in which the velocity decreases with the decrease in the height. The typhoon wind profiles are not stationary but changes abruptly.

At present, there isn't a clear and generally accepted definition for the term "Monsoon". Parameters used for studying monsoon are also quite different. S1fmmer monsoon affects east part of Afghanistan. In spite of climatic variety and wide mountainous area, network of meteorological stations of Afghanistan often lacks sufficient and long-term data. Monsoon circulation is originated by formation of thermal lows after June until September. The lows of L1 and L2 in Pakistan and Afghanistan are representatives of Intertropical Front (ITF). Within the low of L1 exists shallow maritime airmass, but there is warm continental airmass in L2. In most parts of Pakistan monsoon rainfall includes nearly 50% of total precipitation, whereas in Afghanistan monsoon rainfall is short and limited to eastern part of the country. Afghanistan monsoon rainfall falls into isolated storms with great time intervals. The monsoon circulation should be set before its first low reaches the country. The first stage of monsoon starts the second half of May until the beginning of June and its peak period is established when the first low reaches in early June and the last storms in August and September. It is expected that westward penetration of maritime airmass over Afghanistan in advancing periods of monsoon occurs in upper levels. Conditions of monsoon in Afghanistan are nearly similar to West Africa regions and furthermore it is complicated by Hindu Kush Range. Last limit of monsoon penetration reaches around north and northwest vallyes of Kabul, and Hindu Kush blocks its further penetration to west. One of the monsoon's features is periodic and non-periodic displacement of ITF. Its reason sets in consecutive displacing of continental airmass with maritime one and vice Versa. Another interesting feature of monsoon is its breaks. This phenomenon is established by temporal retreat or chang of monsoon airmass stratification due to penetration of midlatitude troughs to south and subtropical regions.