Weather during the Pre-Monsoon season is on account of heat and heat generated weather activities. A couple of weather systems become a semi-permanent feature during this period and are responsible for the weather occurrences across the country.
While the wind discontinuity in the Peninsular India continued to affect the weather over Central and Interior Peninsula on account of differential heating, the offshore trough was responsible for weather activities in East India. Also, heat lows in North and Central India got accentuated in case a Western Disturbance passed through the Western Himalayas and resulted in some action over the region as well.
Most of these weather activities have a diurnal variation, i.e. thunderstorm or rain usually start affecting the area during the late afternoon hours resulting in a drop in temperatures during the night. However, the next morning, temperatures witness a rise once again.
These activities are patchy in nature and are responsible for causing dust storm, thunderstorm, severe lightning, hailstorm and high-velocity winds in the weather sensitive pockets. However, other stronger weather systems end up altering the weather patterns across India.
One such weather system was brewing in the Bay of Bengal and has currently intensified into a well-marked low. The system now lies between the Sri Lanka coast and the Gulf of Mannar adjoining Southwest Bay of Bengal and is expected to intensify into a depression soon.
These weather systems have a long trail and give sufficient notice of their arrival, formation, and their movement. Currently, the system is favourably placed in the sufficiently warm waters which is a preliminary but an essential condition. Also, weak wind shear adds to the favourable situation of the weather system.
However, the proximity of the land from the system (Tamil Nadu and Sri Lanka in this case) does have an adverse effect on its growth, but warm waters and weak wind shear are letting the weather system to sustain and possibly become stronger.
Such strong weather systems alter the weather situation completely across the country. These systems take full control of all the Pre-Monsoon activities occurring in various areas of India. In fact, small localized systems get subsumed by the stronger systems.
Due to this, the entire wind flow is directed towards the system for its growth. Thus, hot and dry winds from the land increase heatwave conditions over several parts of the country. Some pockets experience severe heatwave conditions which only relent when the weather system either weakens or moves away.
With the weather system currently lingering in the Bay, torrential rains accompanied by strong winds are likely over Tamil Nadu in particular. Also, parts of Karnataka and Kerala are expected to receive good showers. On its way of moving along the coast, it will enhance the weather activity over Andhra Pradesh which may later extend to Odisha as well. After that, the system is expected to go further eastwards towards Bangladesh.
The effect of the weather system shortly remains in question. However, the system has the capability of intensifying into a cyclonic storm as well. The system is going to be a slow-moving system having the potential to strengthen further. It may also turn out to be a mild cyclonic storm. Skymet will keep you updated on the further movement of the weather system.
