BEIJING — The heaviest rain since the beginning of the flood season is expected to hit the Beijing-Tianjin-Hebei region on Aug 12, the Beijing Meteorological Service said on Aug 11.

At 5:40 pm on Aug 11, Beijing meteorological authorities issued a yellow alert for rainstorms. Starting from 8 am on Aug 12 to 8 am on Aug 13, torrential rains and rainstorms are expected to lash the region.

"Beijing is to receive 40 to 80 mm of precipitation on average during the rainfall, with around 50 mm in urban areas and up to more than 200 mm in parts of the western and northern mountainous areas," said Yu Bo, deputy director of the Beijing meteorological observatory.

The city's meteorological authorities and flood control headquarters advised residents to reduce outdoor activities and recommended that construction sites stop operations in Beijing from the morning of Aug 12 until the evening.

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