India is bracing for another day of significant monsoon activity on Friday, September 18, with heavy rainfall anticipated in various regions including the eastern, northern, and southern parts of the country. The India Meteorological Department (IMD) issued a weather bulletin on Thursday, September 17, highlighting the probability of intense rain at isolated locations across numerous states and Union territories. Accompanying the rains are expected thunderstorms, lightning strikes, and gusty winds that may affect central and western India.

Regions Expected to Experience Heavy Rainfall

The IMD’s regional forecast for September 18 indicates that heavy rainfall is likely in isolated areas of Sub-Himalayan West Bengal, Sikkim, Bihar, and Odisha. In southern India, significant rain is anticipated across the Andaman & Nicobar Islands, Tamil Nadu, Puducherry and Karaikal, Kerala and Mahe, as well as Lakshadweep. In northern India, East Rajasthan is also set to experience heavy rainfall in specific locations.

The weather patterns are influenced by various atmospheric systems currently active across the country, with monsoon conditions remaining robust in these regions. As thunderstorms are predicted with possible lightning and gusty winds, states like Andhra Pradesh, Telangana, West Madhya Pradesh, Chhattisgarh, and Gujarat could experience wind speeds ranging from 30 to 50 kmph. In contrast, Kerala is expected to face hot and humid weather throughout the day, adding to the discomfort.

The persistent rainfall and related weather phenomena are attributed to atmospheric systems that include cyclonic circulations and troughs. A cyclonic circulation is a rotating air system while a trough represents a low-pressure area conducive to moisture influx. Presently, a low-pressure area is situated over Saurashtra and adjacent regions of the Arabian Sea, while an active monsoon trough extends over the northern and eastern plains, thereby facilitating moisture movement further into the country.

Developments in Monsoon Conditions

An upper-air cyclonic circulation is reportedly moving in from Southeast Asia towards the North Andaman Sea. The IMD suggests that this developing system may result in the establishment of a new low-pressure area by September 19, which is anticipated to strengthen and advance towards the coasts of Odisha and Andhra Pradesh in the subsequent days. This evolving situation adds complexity to the precipitation patterns across the region.

As the weather systems undergo changes, rainfall activities are likely to persist in parts of eastern and southern India. Furthermore, the southwest monsoon is expected to commence its withdrawal phase in specific areas of West Rajasthan starting September 19, signalling the onset of the seasonal transition in northwestern India, even as robust monsoonal systems continue to influence other regions of the country.

For September 18, the IMD’s forecast indicates a combination of heavy rain, thunderstorms, gusty winds, and humid conditions across various parts. This highlights the continuing variability in monsoon weather as the month progresses, which is typical during this period of the year. The forecast encourages local residents to be vigilant as weather conditions may rapidly evolve, affecting daily life and activities.

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