Chennai, May 12: With the severe cyclonic storm advancing slowly towards the coast, it is likely to hit northern Tamil Nadu, including the metropolis, and south Andhra coast only tomorrow afternoon, bringing in heavy rainfall. According to the latest bulletin from the regional weather office here, the storm, in the form of heavy to very heavy rainfall and strong winds, is expected to cross the coast tomorrow afternoon bringing rainfall over Tiruvallur, Chennai, Kancheepuram, Villupuram and Cuddalore districts and Pondicherry. The storm over South Bay remained practically stationary until this evening and lay centred about 650 kms east-south-east of Chennai. Formation of such a severe cyclone is very rare during peak summer season. Bureau Report