Parts of south China affected by the worst winter weather in 50 years were shrouded in heavy fog on Monday morning, adding to traffic woes caused by snow and frost over the last three weeks, Xinhua reported. Visibility was less than 100 meters in parts of Chongqing Municipality and the provinces of Anhui, Jiangsu, Zhejiang, Hubei, Jiangxi, Hunan and Guizhou, the China Meteorological Administration (CMA) said. Meanwhile, a new wave of snow, rain and sleet is likely to hit parts of central and south China on Monday and Tuesday, including Chongqing and the provinces of Hubei, Henan, Yunnan and Guizhou, the CMA warned. The heavy fog forced 50 flights to be postponed or cancelled at an airport in Nanjing, capital of Jiangsu Province, on Monday morning, local authorities said. It also led to temporary expressway closures in parts of Zhejiang, Hunan, Anhui, Jiangxi and Jiangsu, the Ministry of Communications said.