This standard specifies the levels of sandstorms and sandstorm processes. This standard applies to meteorology, environmental protection, agriculture, forestry, transportation and other fields related to sandstorms. GB/T 20480-2006 Sandstorm Weather Levels GB/T20480-2006 Standard download decompression password: www.bzxz.net
This standard specifies the levels of sandstorms and sandstorm processes. This standard applies to meteorology, environmental protection, agriculture, forestry, transportation and other fields related to sandstorms.

ICS 07. 060
National Standard of the People's Republic of China
GB/T20480—2006
Grade of sand and dust storm weather061214000015
Issued on August 28, 2006
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on November 1, 2006
This standard is proposed by the China Meteorological Administration.
This standard is approved by the Policy and Regulations Department of the China Meteorological Administration. Foreword
This standard was drafted by the National Meteorological Center of the China Meteorological Administration and the Disaster Forecasting Department of the China Meteorological Administration. The main drafters of this standard are Niu Ruoyun, Tian Qiuying, Bi Baogui, Yang Keming and Wang Youyu. GB/T20480—2006
GB/T 20480—2006
This standard is compiled in accordance with the Meteorological Law of the People's Republic of China, and is based on the reference and reference of national standards and industry standards. Sandstorm is a general term for a weather phenomenon in which the wind blows dust and sand particles from the ground into the air, making the air turbid. It includes floating dust, blowing sand, sandstorm, strong sandstorm and extremely strong sandstorm weather. Sandstorm is one of the main disastrous atmospheric systems affecting the northern region of my country. In areas where sandstorm occurs, it causes great losses to people's lives and property. my country's meteorological department has been carrying out sandstorm weather forecast services since 2000, and compiles the "Sandstorm Atmosphere Yearbook" every year. In order to better grasp the laws of sandstorm atmosphere activities, improve the forecast and warning of sandstorm weather, especially the forecast and warning of sandstorm, strong sandstorm and super strong sandstorm weather processes, reduce the losses caused by sandstorm atmosphere and better prevent sandstorm atmosphere. It is necessary to unify and standardize sandstorm weather and sandstorm weather processes, so as to improve the accuracy of sandstorm weather forecast. This standard provides the classification of sandstorm weather and sandstorm weather processes. 1 Scope
Sandstorm weather level
This standard specifies the level of sandstorm weather and sandstorm weather processes. This standard is applicable to meteorology, insurance, agriculture, forestry, transportation and other fields related to sandstorm atmosphere. 2 Terms and Definitions The following terms and definitions apply to this standard. Sand and Dist Weather Sand and Dist Weather Storms and particularly severe sand and dust storms in which the wind blows away dust and sand particles from the ground, making the air turbid. Sand and Dust Weather Process Sand and Dust Weather Process and Special Weather Process GB/T 20480—2006 A general term for various weather phenomena, including the weather processes of floating dust, blowing sand, sandstorms, the development and disappearance of severe sand and dust, including floating dust weather processes, blowing sand weather processes, sandstorm weather processes, and severe dust storm weather processes.
weather process
The whole process of the occurrence, development, disappearance and evolution of the atmosphere or atmospheric system.
visibilitywww.bzxz.net
Visibility
The ability of normal human vision to distinguish a moon object with a sufficiently large viewing angle and sufficient brightness from the background under the weather conditions at that time. The unit is meter (m) or meter (km).
The maximum distance of meters.
windspeed
The horizontal displacement of air per unit time. The unit is meter per second (m/s) kilometer per hour (k/h). 2.6
nationalbasiemeteorologicalstationNational basic meteorological station
Abbreviated as basic station. ：
A ground meteorological observation station set up according to the needs of national climate analysis and weather forecasting. Most of them are responsible for regional or national meteorological information exchange tasks and are the main body of the national weather and climate station network. 2.7
National Basic Climatic Station
National Basic Climatic Station is referred to as the basic station.
According to the national climate zoning and the requirements of the global climate observation system, a climate observation station is set up to obtain long-term and continuous climate data with full representativeness.
Grades of Sand and Dust Weather
3.1 Classification Principles and Grades
Grades of Sand and Dust Weather are mainly divided according to the horizontal visibility of the ground at the time of sand and dust weather, and are divided into five grades: floating dust, blowing sand, sandstorm, strong sandstorm and extremely strong sandstorm.
3.2 Floating Dust
When there is no wind or the average wind speed is ≤3.0m/s, dust and sand float in the air, making the horizontal visibility less than 10km.
3.3 Blowing sand
The wind blows up the dust on the ground, making the air quite muddy, and the horizontal visibility is within 1km~-10km. 3.4 Sandstorm
The strong wind blows up the sand on the ground, making the air very muddy, and the horizontal visibility is less than 1km. 3.5 Strong sandstorm
The strong wind blows up the dust on the ground, making the air very turbid, and the horizontal visibility is less than 500m. 3.6 Extremely strong sandstorm
The strong wind blows up the dust on the ground, making the air extremely muddy, and the horizontal visibility is less than 501m. 4 Levels of sandstorm weather processes
4.1 Classification principles and levels
The levels of sandstorm weather processes are divided into five levels: floating dust weather process, blowing sand weather process, sandstorm weather process, strong sandstorm weather process and extremely strong sandstorm weather process, based on the number of days when sandstorm weather occurs in batches at the national basic (quasi) stations and the level of the dust atmosphere. If a sandstorm weather process reaches two or more levels at the same time, the strongest level of the sandstorm weather process shall prevail. 4.2 Floating dust weather process
In the same weather process, 5 or more adjacent national basic (quasi) stations have sandstorm weather with floating dust for the first time at the same observation time.
4.3 Blowing sand weather process
In a weather process, 5 or more adjacent national basic (quasi) stations have blowing sand or stronger sandstorm weather for the first time at the same observation time.
4.4 Sandstorm weather process
In the same meteorological process, three or more adjacent national basic (standard) stations experienced sandstorms or stronger sandstorm weather at the same observation time.
4.5 Strong sandstorm weather process
In the same meteorological process, three or more adjacent national basic (standard) stations experienced strong sandstorms or extremely strong sandstorm weather at the same observation time.
4.6 Extremely strong sandstorm weather process
In the same atmospheric process, three or more adjacent national basic (standard) stations experienced extremely strong sandstorm weather at the same observation time.
Arts and literature
[1] Zhu Binghai, Zheng Pengfei, Shu Jiaxin, Meteorological Dictionary. Shanghai: Shanghai Dictionary Publishing House 1985 GB/T 20480—2006 [2] China Meteorological Administration Document, Qifa [2003] No. 12. Notice on Issuing the Interim Provisions on Dust Weather Warning Service (Revised)\, Annex: Provisions on Dust Weather Warning Service (Revised) 13 GB/T 19201-2003 Tropical Cyclone Scale. Beijing: China Standards Press, 2003 GB/T 20480-2006 People's Republic of China National Standard Sand and Dust Storm GB/T 2048020G6 China Standards Press Published and Distributed No. 18, Sanlihe North Street, Fuxingmenwai, Beijing No.
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