Contrasting weather patterns are unfolding across the country following the withdrawal of the monsoon, establishing distinctly different conditions in the northern and southern geographies. Northern and eastern regions are currently experiencing an early autumn nip in the air, whereas the southern peninsula is enduring intense spells of rainfall driven by strong regional circulations. Simultaneously, northern mountainous belts are witnessing the arrival of a fresh western disturbance accompanied by an active cyclonic circulation over the Himalayas adjoining Himachal Pradesh. This interaction is triggering potential precipitation over Jammu and Kashmir, Leh-Ladakh, Himachal Pradesh, and Uttarakhand, alongside localized spells over parts of Punjab and Haryana, with minor effects possibly brushing Delhi-NCR and western Uttar Pradesh.
Multiple Weather Circulations Drive Southern Rain Activity
Atmospheric activity across peninsular India is being governed by several converging weather systems. A distinct cyclonic circulation remains stationed over the west-central Bay of Bengal and adjoining coastal stretches of southern Andhra Pradesh and Tamil Nadu. In addition, an upper-air cyclonic circulation is active over north interior Karnataka and neighboring zones. Adding to this instability, an atmospheric trough extends from the Lakshadweep area across Karnataka and southern Andhra Pradesh into the west-central Bay of Bengal. Over the southwest Arabian Sea, a cyclonic circulation has successfully induced the formation of a low-pressure area. Meteorologists project that this low-pressure system is set to intensify over the next 24 hours, which will likely heighten weather activity across adjoining maritime and coastal belts.
Severe Downpours and Squally Winds in Tamil Nadu and Andhra Pradesh
Driven by these combined features, intense rainfall is forecast to persist over Tamil Nadu, Puducherry, and Karaikal through October 24. Heavy precipitation has already made a substantial mark, with rain gauges in Tamil Nadu recording 21 centimeters or more during the 24-hour cycle ending at 8:30 AM on October 18. During the same tracking window, rainfall figures ranging between 7 and 11 centimeters were registered across coastal Andhra Pradesh, Rayalaseema, Telangana, and south interior Karnataka. Extremely heavy rain spells are anticipated across Tamil Nadu, Puducherry, and Karaikal through October 21, followed by scattered heavy showers between October 22 and 24. Sustained thunderstorm activity, lightning, and squally winds clocking speeds of 40 to 50 kmph, gusting up to 60 kmph, are forecast to batter these areas throughout the week.
Forecast for Karnataka, Kerala, and Adjacent Regions
The persistence of these energetic circulations will impact adjacent southern states as well. South interior Karnataka is slated to experience heavy rainfall from October 19 through October 24, with localized heavy showers also affecting coastal Karnataka. Meanwhile, north interior Karnataka is expected to see isolated to scattered precipitation up to October 24. For Kerala and Mahe, heavy spells are likely to occur intermittently through October 24, while the Lakshadweep archipelago should brace for heavy downpours primarily between October 21 and 23. In coastal Andhra Pradesh, Yanam, and Rayalaseema, substantial rainfall is expected from October 19 to 21, with strong surface winds lingering until October 22. Telangana will likely witness thunderstorm activity and lightning through October 21.
Steady Weather Across Central and Northern Plains
In the northern terrain, a cyclonic circulation triggered by the western disturbance lingers over Himachal Pradesh and adjacent sectors of Punjab. Further west, another cyclonic circulation is centered over southern Rajasthan, with an associated trough running from southwest Rajasthan toward the northeast Arabian Sea. Despite these localized developments, comprehensive forecasts indicate that northwest, central, west, and northeast India will not encounter severe climatic upheavals over the coming week. In the east, systems in the Bay of Bengal are inducing localized rainfall across West Bengal and Odisha, with light showers possible over Bihar and Jharkhand. Nevertheless, the vast majority of substantial rainfall activity will remain anchored over the southern peninsula.
