Beijing: Heavy rains will batter parts of southwest China in the next three days, according to the national observatory forecast on Sunday. Regions in Sichuan basin will experience downpour of up to 130 mm within 24 hours, Xinhua news agency reported. The precipitation will continue on Tuesday and Wednesday, with parts of Sichuan and Yunnan provinces as well as Tibet expecting heavy rains, the National Meteorological Centre said. Heavy rains will also hit regions in Hebei, Henan and Shandong provinces as well as Guangxi, Guangdong and Fujian over the next 24 hours. The observatory issued a blue alert, the least serious of the nation's four-tier warning system, for torrential weather as hailstone and thunderstorm are expected in some parts of Shanxi, Hebei, Henan, Shandong and Guangdong provinces on Sunday and Monday.