A woman rides in rain in Zhengzhou, capital of central China's Henan Province, May 26, 2013. Many parts in Henan witnessed rainfall since Saturday. Local meteorological authorities issued a yellow alert on thunder.(Xinhua/Wang Song)

Local residents ride in rain in Zhengzhou, capital of central China's Henan Province, May 26, 2013. Many parts in Henan witnessed rainfall since Saturday. Local meteorological authorities issued a yellow alert on thunder.(Xinhua/Wang Song)

People and vehicles move on a street in rain in Zhengzhou, capital of central China's Henan Province, May 26, 2013. Many parts in Henan witnessed rainfall since Saturday. Local meteorological authorities issued a yellow alert on thunder.(Xinhua/Wang Song)

A woman rides in rain in Zhengzhou, capital of central China's Henan Province, May 26, 2013. Many parts in Henan witnessed rainfall since Saturday. Local meteorological authorities issued a yellow alert on thunder.(Xinhua/Wang Song)

Local residents ride in rain in Zhengzhou, capital of central China's Henan Province, May 26, 2013. Many parts in Henan witnessed rainfall since Saturday. Local meteorological authorities issued a yellow alert on thunder.(Xinhua/Wang Song)

Cars pass a water accumulated area caused by rain in Zhengzhou, capital of central China's Henan Province, May 26, 2013. Many parts in Henan witnessed rainfall since Saturday. Local meteorological authorities issued a yellow alert on thunder.(Xinhua/Wang Song)