There was an instant gale of 1 1 in Dalian, and the "one wind" stirred up a thousand waves. How long will the windy weather last?

Affected by storm surge and strong sea breeze, all ro-ro passenger ships and land island transport ships under the jurisdiction of Dalian have been suspended, and the maritime department has launched three-level countermeasures to prevent extreme weather. The precipitation in the east and north of Wafangdian and the north of Pulandian has reached10-20 mm. It is estimated that there will be 30-50 mm precipitation in the next 2-3 hours.

The maximum instantaneous wind force 1 1 occurred in Dayaowan Lingang Industrial Zone, Dagushan Street. Affected by continuous heavy rain and windy weather, trees in some sections of Dalian fell or broke their branches. The Greening Department of Dalian Urban Management Bureau inspected the main and secondary roads of Wu Si Road and Chenguang Street, as well as some alleys and back alleys. According to the priority, urge all districts to deal with lodging and broken branches in time to ensure the safety of people, vehicles and traffic in the city.

Whether this tree will be blown down by the wind is because of its large crown and large windward side. The windward area of urban roadside greening trees with general size can reach 5m2. In this case, the total stress is about 3kn, which is equivalent to the weight of four adults. Because the crown is high, the roots will be subjected to bending force, so the roots will bend if they can't bear it. In extreme weather, I hope everyone stays at home to avoid accidents.

1 1 gale is almost once in 50 years. According to 1 1 the average wind pressure of strong wind is 0.585kN/m2, the windward area of human is about 0.5m2, and when it blows directly to human body, the wind force is 292.5n, which is equivalent to the feeling of being pressed by a 30 kg weight. The adult's weight is about 750N, so the strong wind of 1 1 can't blow the human body anyway. There will be a storm surge of 50-80 cm along the coast of Dalian. Hutan tidal station will reach the high tide level of local yellow warning tide level, and the warning tide level is yellow. In addition to destroying crops and trees, engineering facilities will also be damaged to varying degrees. ?