Arab Weather - The latest climate data indicates a rise in surface water temperatures in the Arabian Sea and the northern Indian Ocean, including the Bay of Bengal, reaching approximately 30 degrees Celsius. This increase is considered significant from a meteorological perspective, as these temperatures fall within the range conducive to the development of tropical systems, such as tropical depressions, storms, or even cyclones, provided other supporting weather conditions are present. Warm water temperatures are a major factor in the formation and intensification of cumulonimbus clouds, thus increasing the likelihood of tropical weather systems developing in these oceans in the coming period.
From a scientific standpoint, weather specialists at the Arab Weather Center noted that although the water surface temperature is high, which is one of the reasons for the development of tropical systems, the specialists observed that there are obstacles preventing the development of tropical systems in the Arabian Sea at the present time, and these can be summarized in the following points:
Upper-level wind shear:
Computer models revealed strong upper-level wind shear over the Arabian Sea and surrounding areas. In tropical systems such as cyclones or tropical storms, strong wind shear weakens the atmospheric system or even prevents its development (as is the case in the Arabian Sea). This effect occurs because wind shear detaches and disrupts the structure of the atmospheric system, shearing the upper and lower layers of the system apart. This weakens the cloud integration and convection necessary for the development of a cyclone or storm in the Arabian Sea. When strong wind shear is present, it hinders the supply of moisture and energy to the tropical system, preventing it from intensifying. Wind shear is a change in wind speed or direction with altitude in the atmosphere.
The presence of an upper atmosphere:
At the upper atmospheric level, the absence of other atmospheric systems is a prerequisite for the development of tropical systems. However, in the case of the Arabian Sea, a strong high-pressure system exists in the upper atmosphere, representing a layer of compressed air in the upper layers. Atmospheric experts have stated that the presence of this high prevents the tropical system from deepening horizontally in the upper atmosphere because it imposes downward pressure and reinforces sinking currents, thus hindering the upward movement of warm, moist air from the surface, which is essential for the system's strength and development.
The first season of tropical cyclone activity in the Arabian Sea is known as the "pre-monsoon," which precedes the monsoon season and typically occurs during May and June. During this season, sea surface temperatures are sufficiently warm, and wind shear is relatively weak, creating a favorable environment for tropical cyclone development. This period is one of the most significant periods for the formation of depressions or tropical cyclones in the Arabian Sea, before the onset of the southwest monsoon season that affects the region during the summer.
And God knows best.
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