Embedded Depressions
If a circulation forms within the monsoon trough, it is able to compete with the neighboring thermal low over the continent, and a wind surge will occur at its periphery. Such a circulation which is broad in nature within a monsoon trough is known as a monsoon depression. In northern hemisphere, monsoon depressions are generally asymmetric, and tend to have their strongest winds on their eastern periphery. Light and variable winds cover a large area near their center, while bands of showers and thunderstorms develop within their area of circulation.
The presence of an upper level jet stream poleward and west of the system can enhance its development by leading to increased diverging air aloft over the monsoon depression, which leads to a corresponding drop in surface pressure. Even though these systems can develop over land, the outer portions of monsoon depressions are similar to tropical cyclones. In India, for example, 6 to 7 monsoon depressions move across the country yearly, and their numbers within the Bay of Bengal increase during July and August of El Niño events. Monsoon depressions are efficient rainfall producers, and can cause a year's worth of rainfall when they move through drier areas such as the outback of Australia.
Monsoon depressions often strengthen into cyclone status,and a few examples include a monsoonal trough which formed in the Philippine sea on sprouted 3 tropical cyclones which were: Typhoon Odessa, Typhoon Pat and Tropical Storm Ruby. On June 1994, a Monsoonal Trough over the South China Sea was associated with an embedded depression,which became Tropical Storm Russ.
Read more about this topic: Monsoon Trough
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