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A fresh low pressure area has sprung up over Gangetic West Bengal and neighbourhood on Thursday, helping slot the crucial land-based monsoon trough back to its normal position.
The ‘low' may have formed over land, but it was sufficient to route the monsoon trough and keep its eastern end anchored in the northeast Bay of Bengal.
This is the ‘next best' alignment to the ideal one when a ‘low' sets up a perch over the sea to which the northwest-to-southeast trough empties itself and allows monsoon easterlies to fill and bring rain over land.
CLOUD COVERAGE
The ‘low' seems to have been triggered in the wake of the weakening of north Pacific typhoon, Ma-On, over Japan. Ma-On had failed to ramp up to super typhoon category, failing global models' outlook.
A weather warning said that isolated heavy to very heavy rainfall would occur over Madhya Pradesh and Chhattisgarh during the next two days and over Jharkhand, Gangetic West Bengal and Orissa on Friday.
Global models saw the Gangetic West Bengal ‘low' moving west-northwest over land as in the case of the deep depression originating from the same region but endowed with far more fire power.
RAIN
During the 24 hours ending Thursday morning, fairly widespread rain was reported from over west Madhya Pradesh, Bihar, Uttar Pradesh, Uttarakhand, Himachal Pradesh, Vidarbha and the Andaman and Nicobar Islands.
Fairly widespread rain or thundershowers is likely over the Northeastern States, Lakshadweep and Andaman and Nicobar Islands.
It would be fairly widespread rain also over Uttarakhand and Uttar Pradesh on Friday and scattered thereafter.
Scattered rain or thundershowers would occur over remaining parts of the country outside west Rajasthan, Andhra Pradesh and Tamil Nadu where it will be isolated.
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