First time: from March 2 to 3, force 4 to 6 wind.
Second time: from March 17 to 18, force 5 to 7 wind.
Third time: from March 22 to 23, muddy rain in Shanxi province.
Fourth time: from March 26 to 28, storm spread to Jianghuai area.
Fifth time: from April 3 to 4, force 8 to 9 wind.
Sixth time: from April 5 to 7, sandy wind in Beijing.
Seventh time: from April 8 to 9, force 8 to 9 wind.