One of the most important components of India’s monsoon system has now shifted to the trough line (trough). This change in the trough line indicates possible changes in rainfall distribution in northern and central India. Meteorologists estimate that this change will increase rainfall in these areas in the coming week. That is, monsoon rains can also be seen in Delhi too. Last week, Delhi was cloudy for two consecutive days, but it did not rain openly.
According to the Meteorological Department, due to a seasonal trough of 2 km of pre-west direction of the national capital, the southeastern moisture winds were continuously flowing towards the city, causing moisture in the atmosphere and cloudy. Showers also fell in some areas. But the anticlonic ridge built in the middle and upper atmosphere was stopping the monsoon entry in Delhi. According to the Meteorological Department, the trough line has moved towards North and Central India, which is about to weaken the antisiclonic ridge over the region, which can catch the monsoon speed.
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What is monsoon trough?
The monsoon trough is a low pressure area spread from northwest India to the Bay of Bengal. It helps in maintaining moisture and plays an important role in rain by extending the monsoon. The trough line of monsoon also promotes the construction and rainfall of clouds. This low pressure line does not remain stable, but keeps moving towards north and south during the monsoon season. It also affects the time and intensity of rain across the country.
What is the effect on rainfall changes in the trough line?
The monsoon trough line has currently shifted to the north direction, it has accelerated the flow of moisture and cyclonic activities, resulting in the forecast of heavy rains in northwest, middle, east and northeast India for the next seven days. This increase in rainfall is especially important for agriculture, because most part of North India depends on monsoon rains for agriculture. States like Punjab, Haryana, Bihar and Uttar Pradesh are expected to benefit from increased rainfall. Increasing moisture in the soil will boost sowing of crops and potentially increase agricultural productivity. However, this heavy rains also cause concern about floods and waterlogging, especially in low -lying areas with insufficient drainage.
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Which factors are the cause of change in the trough line?
Many factors can contribute to shift to the north side of the trough line. The onset of monsoon increased moisture flow on the Arabian Sea due to a continuous low pressure area and the trough line over Vidarbha. Additionally, comprehensive climatic effects such as snow deficiency in the West Himalayan region, the neutral position of Al-Nino and the strong Mascaren High (a high pressure area near the Muscaren Islands in the southern Indian Ocean) have supported the progression of the monsoon. A low pressure Weather system over the Bay of Bengal has attracted moisture and atmospheric energy to the northeast India and pulled the trough line of the monsoon north.