Given the geographical place of southern peninsular India, being at a low latitude near the equator, it begins witnessing the warmth a lot sooner than the remainder of the nation. Spring brings a sure resemblance to a summer time season for this topography.
One of many vital observations is the distinguished land heating over the Deccan Plateau, primarily in Andhra Pradesh’s Rayalaseema and adjoining northern Karnataka. This warmth causes the formation of warmth low over the land, which is extra dominant round Rayalaseema. It additionally causes the event of a thermal north-south trough working from south Tamil Nadu into Madhya Pradesh and Chhattisgarh by the inside components of the peninsula, which turns into vital as land heating progresses.
The opposite salient characteristic is the looks of two anticyclones within the decrease troposphere on both facet of peninsular India in the course of the March-April months. The Arabian Sea anticyclone pushes sizzling, continental dry air into India by the west-northwest; whereas quite the opposite, the Bay of Bengal’s anticyclone introduces a comparatively cool, moist air mass from the Bay of Bengal.
An anticyclone is an space of excessive strain the place air strikes aside and sinks or strikes downward.
The interplay between these two varieties of air plenty types the road of moisture discontinuity. Clouds or thunderstorms kind over this level of interplay each time the atmospheric situations flip beneficial.
The Arabian Sea anticyclone, the stronger and bigger of the 2, stays for nearly three months, disappearing solely after the onset of the monsoon, in late Could or early June. The Bay of Bengal anticyclone introduces cool winds from the Bay, sustaining the temperature alongside the east coast. Nonetheless, this anticyclone disappears a lot earlier, by late April or early Could, setting the stage for the onset of the monsoon.
These, coupled with intraseasonal equatorial wave modulation, define the seasonal dynamics of the peninsular area.