The Hindu Business Line : Rains to spread as Bay circulation persists

Thiruvananthapuram, June 26 Wednesday’s upper air cyclonic circulation over North Bay of Bengal off the north Orissa and West Bengal coasts persisted on Thursday amid indications that the winds might pick up in strength during the next 24 hours.

In its latest update, the India Meteorological Department (IMD) said that rainfall would increase along the west coast and northwest India from Saturday. In the east, isolated heavy rainfall is likely over the North-East, Orissa, North Andhra Pradesh and south Chhattisgarh during the next two days.

Rain or thundershowers have also been forecast to occur at most places over coastal Karnataka and at many places over Kerala, south interior Karnataka, Telangana and north coastal Andhra Pradesh and at a few places over north interior Karnataka and Lakshadweep. Isolated rain or thundershowers are likely over Tamil Nadu, Puducherry, south coastal Andhra Pradesh and Rayalaseema.

RAINS FOR NORTHWEST

Isolated rain and thundershowers are also likely over Punjab, Haryana, Uttarakhand and West Uttar Pradesh during the next 24 hours. This is being precipitated by the residual moisture present in the plains after the passage of the first few monsoon showers and from their interaction with incoming western disturbances.

To the west, Konkan, Goa, Madhya Maharashtra and Marathawada are forecast to receive rain or thundershowers. In central India, rain or thundershowers are likely over east Madhya Pradesh, Vidarbha and Chhattisgarh.

A warning issued by the Regional Met Centre, Chennai, said that isolated heavy rain is likely to occur over coastal Karnataka, Kerala and south interior Karnataka during the next two days. Depleted storage in reservoirs in rain-deficit Kerala, which depends heavily on hydel generation, has prompted a 30-minute load-shedding from Friday.

The deficits are high in the southern districts of the State, while the position was relatively better in the north. The monsoon flows are expected to pick up with the weakening of Typhoon Fengshen as a tropical depression over the Chinese mainland on Thursday.

LOCALISED WHIRLS

But localised circulations over east India and the northeast were able to salvage some of these flows from midway over the Bay of Bengal and get them redirected unto themselves.

This is how wet spells in these regions prospered even as the west and the southwest coasts dried up. But prospective convergence of the flows in the Arabian Sea and the Bay has now prompted a forecast for further increase in rainfall along the west coast, the Indo-Gangetic plains and the adjoining central India from Sunday. On Thursday, the axis of the land-based monsoon trough passed through Anupgarh, Pilani, Agra, Kanpur, Siddi, Chaibasa, Balasore and southeastward into the east-central Bay. An offshore trough from Maharashtra coast to Kerala coast persisted.

The cyclonic circulation over west Uttar Pradesh and neighbourhood too persisted from overnight. The other cyclonic circulation over Gangetic West Bengal and adjoining Orissa and Jharkhand had become less marked. A fresh western disturbance lay over north Pakistan and adjoining Jammu and Kashmir.

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