High of 47.7C recorded in northern city of Allahabad, with most recorded deaths due to heatstroke and dehydration in rural areas in southMore than 500 people are believed to have died in a heatwave in India as temperatures approach 50C (122F) in parts of the country.Allahabad, a city in the north, saw the mercury touch 47.7 C (117.8F) on Sunday, according to local media.