An exclusive monsoon system formed over Bay of Bengal (BoB), slightly off set from its normal position. An unusually strong deep depression, nearly touching the grade of weak cyclonic storm, emerged over northeast Bay of Bengal. Normally, monsoon systems form over head bay (BoB) or northwest BoB at this point of time. The deep depression had very little sea travel and therefore could not intensify much. As it is, cyclonic storms are rather infrequent or even outliers during the core monsoon months of July and August.
The deep depression crossed Bangladesh coast yesterday evening and rapidly moved over Gangetic West Bengal. It is centered around 23.3°N and 86.7°E, at 11.30 a.m today, between Bankura and Purulia. It is likely to move west-northwest and shift over Jharkhand and North Chhattisgarh by today evening and weaken to a depression. The system will further loose strength to become a low pressure area in the subsequent 24 hours.
Deep depression has lashed Odisha and West Bengal with heavy rains in the past 24 hours. Northern and interior parts of Odisha have registered heavy downpour. Chief amounts of rainfall recorded were : Bolangir-173mm, Bhawanipatna-145mm, Angul-150mm, Keonjhargah-150mm, Balasore-138mm. Entire state of West Bengal was drenched with moderate to heavy rainfall and southern half of state got a bigger share. Locations recording more than 60mm rainfall were : Diamond Harbour-96mm, Digha-77mm, Asansol-60.5mm, Bankura-68.9mm, Kolkata-84mm. Heavy rainfall belt will extend further to cover more parts of eastern and central India.
Intensity and spread of rainfall will increase today to cover Odisha, Jharkhand, Bihar, Chhattisgarh and Madhya Pradesh. Prominent locations for heavy rainfall as identified include Bolangir, Keonjhargarh, Sambalpur, Angul, Ambikapur, Bilaspur, Raipur, Durg, Ranchi, Jamshedpur, Daltonganj, Gaya, Patna, Jabalpur, Umaria, Sagar, Seoni, Chhatarpur, Tikamgarh, Datia, Bhind, Morena, Gwalior, Guna, Shivpuri, Sheopur, Ashoknagar. Heavy rainfall belt will keep vacating the rear section of Odisha, West Bengal, Jharkhand, Bihar and will advance further to cover mainly states of Madhya Pradesh, Southwest Uttar Pradesh and some parts of Rajasthan and Delhi tomorrow. These parts will experience rain and thundershowers on 04th and 05th as well.
Susequently, the monsoon trough is expected to shift northward close to the foothills from 06thonward. Spread of rainfall will get confined to Indo-Gangetic plains, more severe along the foothills. Another monsoon cyclonic circulation is likely to develop around 09th-10th Aug, pulling the monsoon trough to the south. This monsoon system will not be as strong as the current one and therefore the spread and intensity of rainfall will be subdued.
