BEIJING, July 22 -- China's Ministry of Water Resources and the China Meteorological Administration on Saturday jointly issued a yellow alert for mountain torrents in some areas.

From 8 p.m. Saturday to 8 p.m. Sunday, mountain torrents are expected to occur in parts of Inner Mongolia, Jilin and Heilongjiang, according to the alert.

Local authorities are advised to strengthen real-time monitoring, flood prevention and early warning, and evacuate residents when necessary.

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