【青海省海西州出现沙尘天气 巨大“沙墙”遮天蔽日】7月20日，青海省海西州部分区域出现沙尘天气。当天19时04分，海西州大柴旦行委柴旦镇出现强沙尘暴，极大风速达14.9米/秒，最小水平能见度仅181米。沙尘暴宛如一堵遮天蔽日的“沙墙”。目前，沙尘天气已经结束，海西州各地均已恢复晴朗。A heavy sandstorm hit the Haixi Mongolian and Tibetan Autonomous Prefecture of northwest China's Qinghai Province on Wednesday, reducing visibility to less than 200 meters in some regions. The sandstorm traveled from west to east, and gradually built up to a strong dust storm by 19:00. The maximum wind speed was 14.9 meters per second. Visibility was reduced to 181 meters in the most heavily affected areas. Traffic slowed down considerably in many areas. http://t.cn/A6aEZGu2