How many levels is the gale warning?

Gale warning can be divided into sea gale warning and land gale warning. ?

Sea gale warning

Fishing boats (especially wooden sailboats) at sea in China have weak wind resistance. To ensure safety, the gale warning standard is set at level 6, namely10.8-13.8m/s.

The contents of early warning of strong winds at sea generally include: the causes of strong winds (such as cold air and low pressure). ), the date and time of the gale (expressed by morning, morning, noon, afternoon, evening, midnight, midnight, etc.). ), wind direction, wind direction change time, wind level and strengthening time, etc.

Land gale warning

On land, due to the strong regional characteristics of gale and the great differences between different places, the standards for issuing gale warning are different, and the provinces (autonomous regions and municipalities directly under the Central Government) can decide according to the local gale climate characteristics and the different requirements of professional meteorological services.

The content of gale warning on land is relatively simple, but for the gale on lakes and rivers, it is necessary to explain the time when the wind direction changes and the wind strength increases. The gale caused by typhoon is explained in the typhoon warning, and no gale warning will be issued separately.

a burst

Strong wind, the wind force near the surface layer reaches Beaufort scale 8 (average wind speed 17.2 ~ 20.7 m/s) or above. According to China's meteorological observation service, the wind whose instantaneous wind speed reaches or exceeds 17m/s (or the wind speed reaches or exceeds Grade 8 visually) is regarded as strong wind. A windy day is called a windy day. In China's weather forecast business, Beaufort's 6 (the average wind speed is 10.8- 13.8 m/s) and above are defined as strong winds.

Strong winds will damage ground facilities and buildings; The strong wind at sea affects navigation, offshore construction and fishing, which is very harmful and is disastrous weather.

There are many weather systems that produce strong winds, such as cold front, thunderstorm, squall line and cyclone. The strong wind of tropical storm appears in the strong pressure gradient area of vortex and rotates counterclockwise; The cold front gale is located after the front crossing; Thunderstorms and squall lines appear in the airflow flowing from the descending airflow, and they are dragged to the near ground by thunderstorms when they cross the boundary. The narrow tube effect of topography can increase the wind speed and make some areas become windy areas, such as Alashankou in northern Xinjiang and Taiwan Province Strait.