CHENNAI: The northeast monsoon gathered pace on Tuesday as a low-pressure area over the Bay of Bengal quickly intensified into a well-marked low pressure area, bringing intermittent light to moderate rain over coastal and adjoining districts, including Chennai. The intensity is likely to increase on Wednesday, with IMD issuing a red alert for extremely heavy rainfall (more than 20cm in 24hours) in four north TN districts, including Chengalpet, and an orange alert for heavy to very heavy rainfall (12-20cm in 24hours) in 11 north and delta districts, including Chennai, Tiruvallur and Kancheepuram, on Wednesday. The orange alert may continue for Chennai, Tiruvallur, Kancheepuram and Ranipet districts, along with Chengelpet, on Thursday. B Amudha, deputy director general (addl charge

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