What are the three wavy lines of the weather sign?

In the weather forecast, the icons of the three wavy lines are breezes, which look like waves. There are three lines, the upper one is rolled up and the lower two are rolled down.

The strength of the wind is expressed by the wind speed, generally measured by the size of the wind or how many meters/second. There are thirteen grades:

Static wind: that is, level 0 wind.

Breeze: that is, level 4 wind. Wind with a wind speed of 5.5-7.9 m/s

Breeze: that is, level 3 wind.

Strong wind: that is, 8 winds. Wind with an average wind speed of17.2-20.7m/s.

Strong wind: 10 wind.

Storm: 1 1 wind. A wind with a wind speed of 28.5-32.6 m/s.

Hurricane: the wind above 12.

The importance of weather forecast

The main contents of weather forecast are the future rain, maximum and minimum temperature, wind direction and wind force and special disastrous weather in a region or city. As far as China is concerned, meteorological stations can accurately predict the location and intensity of natural disasters such as cold waves, typhoons and rainstorms, and can directly serve industrial and agricultural production and people's lives.

Weather forecast is based on meteorological observation data, applying the principles and methods of meteorology, dynamic meteorology and statistics to make a qualitative or quantitative forecast of the weather conditions in a certain area or a certain place in the future. This is an important goal of atmospheric science research. It is of great significance to people's lives.

Nowadays, when people go out, they can decide whether to bring rain gear by listening to or watching the weather forecast. In the past, they had to worry about the weather.