A severe heatwave sweeping India, with temperatures of almost 44oC, the highest in 52 years, has killed at least 80 people this month, officials said on Sunday. The hot weather, which officials say would continue over northern, north-western and central India in the next 48 hours, also may have some impact on wheat production, exporters and flour-mill associations said. New Delhi recorded a maximum temperature of 43.7oC on Saturday, indicating a hot summer in the next two months in the nation's capital and other parts of northern and eastern India. The highest temperature in the past 24 hours was 47oC at Ganganagar city, in Rajasthan state. Summer temperatures have been 4oC-6oC above normal over most parts of northern and central India since March, weather officials said. In the eastern state of Orissa, authorities have decided to shut down schools from next Tuesday, advancing the annual summer holiday. Authorities said they were investigating reports of 53 deaths from various parts of the state. "District collectors have been asked to investigate and submit reports on other deaths," Bhimsen Gochhayat, a government official said. Other deaths were reported from northern state of Uttar Pradesh and central Madhya Pradesh states. India is expected to produce about 82 million tons of wheat in 2009-2010, but there could be a shortage of 1-1.5 million tons due to the heatwave, said Veena Sharma, Secretary General of the Roller Flour Millers Federation of India. "Most of the harvesting is over, but there definitely will be a slight shortage of 1-1.5 million tons due to the extreme weather conditions," she told Reuters. India is relying on an abundant wheat crop to make up for a 14.2% drop in rice output, the major summer-sown food grain, _ by the worst monsoon  in 37 years last year. Weather officials say with summer temperatures in India set to remain above average, there were hopes of heavy rains at the start of the monsoon season that will help early sowing of rice, soybeans and lentils. What is the main idea of the passage?
A severe heatwave would continue over India. At least 80% people were killed in the disaster this month. A severe heatwave swept India with a great loss. A slight shortage of 1-1.5 million tons is due to the heatwave.