BEIJING — China's national observatory on June 23 renewed a yellow alert for rainstorms across vast stretches of the country for the next 24 hours.

From the night of June 23 to the night of June 24, heavy rain and rainstorms are expected in the regions of Guizhou, Guangxi, Hunan, Jiangxi, Anhui, Jiangsu, Shanghai, Zhejiang, Heilongjiang and Yunnan, the National Meteorological Center said.

Some of these regions will see up to 70 mm of hourly precipitation accompanied by thunderstorms and strong winds, the center said, warning that some areas in Guizhou, Guangxi, Hunan and Jiangxi will experience downpours with up to 180 mm of rainfall in the next 24 hours.

China has a four-tier color-coded weather warning system, with red representing the most severe, followed by orange, yellow and blue.

Local authorities should take necessary precautions against possible flooding, landslides and mudslides caused by heavy rain and halt outdoor operations in hazardous areas, the national observatory said.