Weather Forecast October 31: Cyclone Arnab Weakens, Fresh BoB System Develops; Heavy Rain Likely in Bihar, Odisha and Andhra

Key Takeaways:

• Cyclone Arnab Weakens: The remnant of Cyclone Arnab is expected to weaken further into a low-pressure area over northeast Chhattisgarh and neighbouring regions within 24 hours.
• Fresh Bay of Bengal System: A low-pressure area over the south Andaman Sea is likely to develop into a depression around October 31 and move towards the Andhra Pradesh coast.
• Heavy Rainfall Forecast: Heavy rainfall spells are possible over Bihar, North Coastal Andhra Pradesh, southern Odisha, Northeast Uttar Pradesh, Uttarakhand and the Andaman and Nicobar Islands.
• Significant Temperature Drop: Maximum temperatures have declined by 6–7°C across several parts of eastern, central and northern India following widespread rainfall.
• Forecast Validity: Next 24 hours.

The Weather Systems Over the Country

The well-marked low-pressure area (remnant of Very Severe Cyclonic Storm “Arnab”) over central parts of Chhattisgarh and adjoining Odisha lay over north Chhattisgarh and neighbouring areas at 0530 hours IST on 30 October 2026. It is very likely to continue moving north-northeastwards and weaken further into a low-pressure area over northeast Chhattisgarh and neighbouring areas during the next 24 hours.

The low-pressure area over the south Andaman Sea and neighbouring areas persisted over the same region at 0530 hours IST on 30 October 2026. It is very likely to move west-northwestwards and concentrate into a depression over the southeast Bay of Bengal and adjoining areas of the Andaman and Nicobar Islands and the Andaman Sea around 31 October. Thereafter, it is likely to intensify further and continue moving west-northwestwards towards the Andhra Pradesh coast during the subsequent two days.

The Western Disturbance, as a cyclonic circulation over north Pakistan and neighbouring areas between 3.1 and 4.5 km above mean sea level, persists. The associated trough aloft in the middle and upper tropospheric westerlies, with its axis at 5.8 km above mean sea level, now runs roughly along longitude 70°E, north of latitude 20°N.

The induced upper-air cyclonic circulation over south Punjab and neighbouring areas, at 1.5 km above mean sea level, persists.

An upper-air cyclonic circulation lies over West Uttar Pradesh and neighbouring areas at 3.1 km above mean sea level.

A trough extends from the cyclonic circulation associated with the well-marked low-pressure area over central parts of Chhattisgarh and adjoining Odisha to the cyclonic circulation over south Konkan, across Telangana and North Interior Karnataka, extending up to 3.1 km above mean sea level.

The upper-air cyclonic circulation over north Haryana and neighbouring areas, at 0.9 km above mean sea level, has become less marked.

The upper-air cyclonic circulation over south Konkan and neighbouring areas, extending up to 3.1 km above mean sea level, has become less marked.

Weather Activities During the Last 24 Hours

During the last 24 hours, moderate to heavy rain occurred over Odisha, West Bengal, Chhattisgarh, Jharkhand, Bihar, Delhi, and West Uttar Pradesh.

Light to moderate rain with one or two heavy spells occurred over the Andaman and Nicobar Islands.

Light to moderate rain occurred over East Uttar Pradesh, parts of Punjab, Haryana, East Rajasthan, Uttarakhand, and at a few places in Vidarbha, North Madhya Maharashtra, western parts of Assam, Nagaland, Manipur, and Mizoram.

Light rain occurred over North Interior Karnataka, coastal Andhra Pradesh, and North Telangana.

Maximum temperatures dropped significantly by 6 to 7 degrees over many parts of Odisha, West Bengal, Bihar, Chhattisgarh, East Madhya Pradesh, West Uttar Pradesh, Delhi, and parts of Punjab and Haryana.

Weather Forecast

During the next 24 hours, light to moderate rain with a few heavy spells is possible over Bihar, North Coastal Andhra Pradesh, the south coast of Odisha, Northeast Uttar Pradesh, Uttarakhand, and the Andaman and Nicobar Islands.

Light to moderate rain with one or two heavy spells is possible over Sub-Himalayan West Bengal and Sikkim.

Light to moderate rain may occur over Nagaland, Manipur, Mizoram, Bihar, Gangetic West Bengal, Jharkhand, Odisha, parts of Chhattisgarh, coastal Andhra Pradesh, parts of Telangana, Delhi, East Rajasthan, and parts of Punjab and Haryana.

Light rain is possible over Vidarbha, Madhya Maharashtra, Konkan and Goa, Tamil Nadu, Kerala, and Karnataka.

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Arnab Weakens Inland, but Rain Threat Persists Across Central India