Chennai:District administrations have declared a holiday for all schools in Chennai, Kancheepuram and Tiruvallur district on Tuesday, following heavy rains predicted in these areas by MeT department on Monday. The Indian Meteorological Department has forecast heavy to very heavy rainfall in the coastal districts of Tamil Nadu due to a low pressure in the Bay of Bengal. In the last 21 hours starting 8.30am on Sunday, Chennai’s Nungambakkam observatory has recorded 6.6cm of rain. Schools in Chennai and a few other coastal districts of Tamil Nadu reopened last Tuesday after a week’s rain holidays.