Wind speed and wind grade table

Wind speed (m) * sea surface wave height of land objects (m)

2 breeze 1, 6-3, 3 feels strong wind, small wave crest does not break 0, 2.

6 strong wind 10, 8- 13, 8, the power line has a big wave to a drop of 3, 0.

10 strong wind 24, 5-28, 4 uprooted trees, waves rolling and roaring 9, 0

First, how to specify the corresponding relationship between wind level and wind speed.

wind scale

Wind speed (m/s)

0 no wind 0, 0-0 2 static, smoke straight wind.

1 soft wind 0,3-1,5 smoke indicates that there is no water drop at the peak of microwave in the wind direction.

2 breeze 1, 6-3, 3 feels windy, and the small wave crest is not broken.

3 breeze 3, 4-5, 4 the peak of flag propagation and wavelet burst.

Level 4 breeze blows dust waves and foam peaks at levels 5, 5-7 and 9.

5 strong breeze 8,0-/kloc-0,0,7 young trees are swaying in the wave-breaking foam peaks.

6 strong wind 10, 8- 13, 8 line noise, big waves, foam off the peak.

7 gale 13, 9- 17, 1 difficult to walk.

Strong winds of magnitude 8 17, 2-20, and magnitude 7 damaged branches, and the waves were long and high.

9-level gale 20, 8-24, 4-level houses are slightly damaged, and the wave peaks roll.

10 strong wind 24, 5-28, 4 uprooted trees and the waves rolled and roared.

1 1 storm 28, 5-32, 6, the main peak of damage is all in water droplets.

Hurricane 12 > 32. 6. Destroy the waves.

Second, the classification standard of wind speed and wind power

The magnitude of wind speed is often expressed by several winds. The level of wind is determined according to the degree of influence of wind on ground objects. Meteorology, at present, it is generally divided into 12 grades according to the magnitude of wind: 0 grade wind is also called windless. Level 2 wind is called breeze, the leaves are slightly noisy, and people feel windy. Level 4 wind is called breeze, and the twigs of trees shake, which can blow up dust and paper on the ground. The 6-level wind is called strong wind, the branches are shaking, the wires are whistling, and it is difficult to walk with an umbrella. Level 8 wind is called strong wind, and the twigs of trees can be broken, which makes people walk against the wind and has great resistance. 10 wind is called gale, which is rare on land. Trees can be pulled up and buildings are seriously damaged. /kloc-winds above 0/2 are called hurricanes, which have great destructive power and are rare on land. In fact, in nature, the wind sometimes exceeds 12. For example, the central wind force of a strong typhoon or tornado may be much larger than the magnitude of 12, but the wind above the magnitude of 12 is rare, so the magnitude is generally not specified. In the weather forecast, we often hear the expression "the north wind is 4 to 5", in which the wind refers to the average wind; If you hear the phrase "gust 7", gust refers to the wind with high and low speed, and the wind at this time refers to the high-speed wind.

Thirdly, the wind level is converted into wind speed.

Wind speed refers to the horizontal distance of air flow per unit time. According to the phenomenon caused by the wind to the ground objects, the wind is divided into 13 grades, which are called wind grades. It is recorded as a number from 0 to 12.

Name of Wind Scale Wind speed (m/s) (km/h) Land surface image sea surface wave height (m) Maximum value (m)

0 No wind 0, 0-0, 2 1 soft wind 0, 3- 1, 5 1-5 Smoke shows that there is no water drop at the microwave peak of wind direction 0, 1, 1.

2 breeze 1, 6-3, 3 6- 1 1. The small wind peak does not break 0, 2 0, 3.

3 Breeze 3,4-5,412-19: the peak breaks 0,61,0.

4 Breeze 5, 5-7, 9, 20-28 blows dust, wavelet and foam peak 1, 0 1, 5.

5 breeze 8, 0- 10, 7 29-38, peak group 2, 0 2, 5 swaying among young trees.

6 strong wind 10, 8- 13, 8-39-49, noisy wires, big waves and foam off-peak 3, 0, 4, 0.

7 Strong wind (strong wind) 13, 9- 17, 1 50-6 10 is difficult to walk, and the peaks are broken and blistered into strips 4, 05, 5.

8 Strong winds 17, 2-20, 7 62-74 damaged branches, and the wave height was 5, 5 7, 5.

9 gale 20, 8-24, 4 75-88, small damaged houses, wave peak, 7,010,0

10 gale 24, 5-28, 4 89- 102 uprooted trees, and the waves rolled and roared 9, 0 12, 5.

1 1 Storm 28, 5-32, 6 103- 1 17 All major damaged peaks are in the form of water droplets 1 1, 51.

12 typhoon (hurricane) > 32, 6 > 1 17 destroy huge waves and soar in the sky 14, 0

Four, wind speed and wind classification standards

The magnitude of wind speed is often expressed by several winds.

The level of wind is determined according to the degree of influence of wind on ground objects. In meteorology, at present, it is generally divided into twelve grades according to the magnitude of wind power:

Level 0 wind is also called no wind.

Level 2 wind is called breeze, the leaves are slightly noisy, and people feel windy.

Level 4 wind is called breeze, and the twigs of trees shake, which can blow up dust and paper on the ground.

The 6-level wind is called strong wind, the branches are shaking, the wires are whistling, and it is difficult to walk with an umbrella.

The 8-level wind is called gale, the twigs of trees can be broken, and people walk in the wind with great resistance.

10 wind is called gale, which is rare on land. Trees can be pulled up and buildings are seriously damaged.

/kloc-winds above 0/2 are called hurricanes, which have great destructive power and are rare on land.

In fact, in nature, the wind sometimes exceeds 12. For example, the central wind force of a strong typhoon or tornado may be much larger than the magnitude of 12, but the wind above the magnitude of 12 is rare, so the magnitude is generally not specified.

In the weather forecast, we often hear the expression "the north wind is 4 to 5", in which the wind refers to the average wind; If you hear the phrase "gust 7", gust refers to the wind with high and low speed, and the wind at this time refers to the high-speed wind.

5. How does the wind speed correspond to the wind level?

Wind is usually expressed by wind direction and wind speed (wind force and wind level). Wind speed refers to the distance that airflow moves in unit time, and the unit is meters per second or kilometers per hour. At present, people classify the wind as 12.

Wind force 0, no wind? The land stood still, and the smoke went straight out. The coast is 0-0 and 2, and the equivalent wind speed (m/s) is 0,3-1,5.

Wind power 1 level. Generally speaking, soft wind and land smoke can indicate the direction, but the wind vane can't turn, and the coastal fishing boats don't move, which is equivalent to the wind speed (m/s) of 0,3-1,5.

The wind force is level 2, and the general situation is light wind. On land, people feel the wind, the leaves ring slightly, and the common wind vane turns. Coastal fishing boats can move with the wind when sailing, and the equivalent wind speed (m/s) is 1, 6-3,3.

The wind force is level 3. Generally speaking, the leaves and twigs on the land are constantly shaking, flags are fluttering in the wind, and coastal fishing boats are gradually swaying. The equivalent wind speed (m/s) is level 3, 4-5 and 4.

The wind force is level 4, which is generally windy. The land can blow up dust and paper on the ground, and the branches shake. When the coastal fishing boats are full of sails, they lean to one side, and the equivalent wind speed (M/S) m/s)5, 5-7 and 9.

The wind force is level 5. Generally speaking, there is a breeze, small trees swaying on the land, and waves on the coastal water surface. The equivalent wind speed (m/s) is 8,0 0- 10/0,7.

The wind force is level 6. Generally, the wind is strong, the branches on the land are swaying, the wires are ringing, it is difficult to hold an umbrella, and the coastal fishing boats have double sails. Pay attention to the fishing danger. The equivalent wind speed is (m/s)10,8-13,8.

The wind force is level 7. Generally speaking, the trees on the land are shaking, so it is inconvenient to walk against the wind. The equivalent wind speed (m/s) 13, 9- 17, 1.

The wind force is 8, the wind is strong, the branches on the land are broken, and the resistance to walking in the wind is great, so ships near the coast can't stay out of it, and the equivalent wind speed (m/s)17,2-20,7.

The wind force is 9, generally: strong wind, damage to the roofs of land chimneys and bungalows (chimney tops and flat tops shaking), difficulty in navigation of coastal steamboats, and equivalent wind speed (M/S) is 20, 8-24 and 4.

Wind power 10. Generally speaking, the wind is very strong, which is rare on land. Trees can be pulled out and houses destroyed, and the navigation of steamboats along the coast is quite dangerous. Wind speed (m/s) 5-28 and 4m/s) 24.

The wind level is 1 1. Generally speaking, storms are rare on land and can cause serious damage. Steamboats along the coast are extremely dangerous, and the wind speed (m/s) is 28,5-32,6.

The wind force 12, there are few hurricanes on land, and their destructive power is extremely great. The coastal waves are extremely high, and the wind speed (m/s) exceeds 32 or 6.

Six, wind rating table

Wind speed is the forward speed of the wind.

The greater the air pressure difference between two adjacent places, the faster the air flow, the greater the wind speed and the greater the wind force. Therefore, the magnitude of wind is usually expressed by wind power.

The unit of wind speed is meters per second or kilometers per hour. When releasing the weather forecast, most of them use the wind level.

How to determine the series of wind power? The distance that the wind moves per second-the wind speed, its formula is "from all the way to nine, multiplied by two". It means: from 1 to 9 winds, multiply each level by 2, and you can roughly get the maximum wind speed.

For example, the maximum speed of the first wind is 2 meters per second, the second wind is 4 meters per second, the third wind is 6 meters per second, and so on. There are also transitional figures between different levels of wind, such as 1-2 meters per second for the first level wind, 2-4 meters per second for the second level wind, 4-6 meters per second for the third level wind and so on.

According to the need, wind power can also be converted into corresponding wind speed, that is, the distance that air flows in unit time, in meters per second. The conversion formula is for reference: two to one is one, and three levels plus one. Grades four to nine are not difficult to calculate, and the series is reduced by two times three.

Ten to twelve are rare, so ten is easy to remember. Ten-level wind speed is twenty-seven, with one more level every four levels.

That is, the wind speed of the primary wind is equal to 1 m/s, the wind speed of the secondary wind is equal to 2 m/s, and the wind level of the tertiary wind plus 1 is equal to 4 m/s.

Subtract 2 from the sequence from 4 to 9 and multiply it by 3 to get the corresponding wind speed. The wind speed algorithm from 10 to 12 is the same. The wind speed of 10 is 27m/s, and then the wind speed of 1 1 is 3 1m/s by adding 4, and the wind speed of 12 is 35m/s. ..

What should I do if the typhoon comes?

1. Before the typhoon comes, residents should listen, watch or check the typhoon warning information in time to understand the government's countermeasures against Taiwan; Then close the doors and windows and turn off electronic equipment such as computers and televisions; Reserve food and water, and prepare emergency items such as mobile power supply and flashlight; Check whether the circuit, fire fighting, gas and other facilities are safe; Residents living in all kinds of dangerous houses, factories and sheds should be moved to safety in time; If you are already in a solid house, stick a "meter" pattern on the window glass with tape to prevent the window glass from breaking.

2. Before the typhoon comes, fishing boats (including small fishing boats) should return to Hong Kong as soon as possible or take shelter from the wind at the nearest port, and take measures to prevent fishing boats from colliding; Fishermen in high-risk places such as beaches, ships, downstream reservoirs and waterlogged areas need to evacuate as soon as possible; Strengthen the safety inspection of fishery facilities and equipment to ensure the normal operation of machinery and equipment; Strengthen the inspection and consolidation of anti-escape facilities such as river crabs and turtles; In addition, make emergency preparations for the collapse of dams and ponds caused by heavy rains, and make emergency preparations for the outbreak of aquaculture products and diseases after typhoons.