GB/T 20480-2017 Sand and Dust Weather Grades GB/T20480-2017 |tt||Standard compression package decompression password: www.bzxz.net
This standard specifies the grades of sand and dust weather at a single station and regional sand and dust weather. ?This standard is applicable to the monitoring, forecasting, warning, assessment and scientific research of sand and dust weather.

ICS07.060
National Standard of the People's Republic of China
GB/T20480—2017
Replaces GB/T20480—2006
Classification of sand and dust
Weather2017-05-12 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2017-12-01 Implementation
GB/T20480—2017
# Arrangement#
1 Scope
2 Terms and definitions
3 Single-station sand and dust weather levels
4 Regional sand and dust weather levels
References
Meipin Sulian Meizao Pharmaceutical Car New Products
This standard was drafted in accordance with the rules given in GB/T1.1-2009. GB/T20480—2017
This standard replaces GB/T20480—2006 "Sand and Dust Storm Weather Levels". Compared with GB/T20480-2006, in addition to the editorial modifications, the main technical changes are as follows:
The name of the standard is changed to "Sand Dust Weather Level"; - The scope of this standard is modified (see Chapter 1, Chapter 1 of the 2006 edition); - The term "Sand Dust Weather Process" and definition are deleted (2.2 of the 2006 edition); - The definition of "Visibility" is modified (see 2.3, 2.4 of the 2006 edition); - The term "wind speed" and definition are deleted, and the term "wind force" and definition are added (see 2.4, 2.5 of the 2006 edition); - The definitions of "National Basic Meteorological Station" and "National Benchmark Climate Station" are modified (see 2.5, 2.6, 2.6, 2.7 of the 2006 edition); - Chapter 3 "Sand Dust Weather Level" is changed to "Single Station Sand Dust Weather Level", and the definition of "Visibility" is modified (see 2.3, 2.4 of the 2006 edition); - The definition of "Wind Speed" is deleted, and the definition of "Wind Force" is added (see 2.4, 2.5 of the 2006 edition); - The definition of "National Basic Meteorological Station" and "National Benchmark Climate Station" are modified (see 2.5, 2.6, 2.7 of the 2006 edition); - Chapter 3 "Sand Dust Weather Level" is changed to "Single Station Sand Dust Weather Level", and the definition of "Visibility" is modified The wind conditions of "floating dust", "sandstorm", "strong sandstorm" and "extremely strong sandstorm" have been changed (see Chapter 3, Chapter 3 of the 2006 edition); Chapter 4 "Sandstorm weather process level" has been changed to "Regional sandstorm weather level", and the relevant contents of its classification principles and classification indicators have been modified (see Chapter 4, Chapter 4 of the 2006 edition). This standard is proposed by the China Meteorological Administration.
This standard is under the jurisdiction of the National Technical Committee for Meteorological Disaster Prevention and Mitigation Standardization (SAC/TC345). This standard was drafted by the National Meteorological Center, and the Forecast and Network Department of the China Meteorological Administration participated in the drafting. The main drafters of this standard are: Niu Ruoyun, Tian Cuiying, Zhang Hengde, and Zong Zhiping. The previous versions of the standard replaced by this standard are: GB/T20480-2006.
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1 Scope
Sand and dust weather levels
This standard specifies the levels of sand and dust weather at a single station and in a region. This standard applies to the monitoring, forecasting, warning, assessment and scientific research of sand and dust weather. 2 Terms and definitions
The following terms and definitions apply to this document. 2.1
Sand and dust weather Weather is a weather phenomenon in which sand and dust are suspended in the air, making the air turbid and reducing visibility. 2.2
weatherprocess
Weather process
The entire process of the occurrence, development, disappearance (death) and evolution of weather or weather systems. 2.3
Visibility
GB/T20480-2017
In the daytime, it refers to the maximum horizontal distance at which a target object (black and of moderate size) can be seen and identified from the sky background by a person with normal vision (with a contrast reading of 0.05) under the prevailing weather conditions; at night, it refers to the maximum horizontal distance at which a medium-intensity luminous body can be seen and identified. 2.4
Windforce
The intensity of wind, which is usually expressed in wind scale in meteorology and in Beaufort wind scale internationally. [GB/T28591—2012, definition 2.2]
National Basic Synoptic station is a ground meteorological observation station set up according to the needs of national climate analysis and weather forecast. [QX/T227—2014, definition 2.3]
National reference climatological station is a ground meteorological observation station set up according to the requirements of national climate zoning and global climate observation system to obtain long-term and continuous data with full representativeness.
[QX/T227—2014, definition 2.4]
3 Single station sandstorm weather level
3.1 Classification principles and levels
Sandstorm weather level is mainly based on the horizontal visibility when sandstorm weather occurs, and is also divided with reference to the wind force. Sandstorm weather is divided into five levels: floating dust, blowing sand, sandstorm, strong sandstorm, and extremely strong sandstorm. 1
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GB/T20480—2017
3.2 Classification indicators
3.2.1 Floating dust
No wind or wind force ≤3, sand and dust floating in the air make the air turbid, horizontal visibility is less than 10km. 3.2.2 Blowing sand
The wind blows up sand and dust on the ground, making the air quite turbid, horizontal visibility is within 1km~10km. 3.2.3 Sandstorm
The wind blows up sand and dust on the ground, making the air very turbid, horizontal visibility <1km. 3.2.4 Severe sandstorm
The wind blows up sand and dust on the ground, making the air very turbid, horizontal visibility <500m. 3.2.5 Extremely strong sandstorm
The wind blows up sand and dust on the ground, making the air extremely turbid, with horizontal visibility <50m. 4 Regional dust weather levels
4.1 Classification principles and levels
Regional dust weather levels are divided into five levels: regional floating dust weather, regional blowing sand weather, regional sandstorm weather, regional strong sandstorm weather and regional extremely strong sandstorm weather, based on the number of national basic meteorological stations and national benchmark climate stations where sandstorm weather occurs in patches and the level of sandstorm weather. If two or more levels are reached at the same time, the strongest regional sandstorm weather level shall prevail. 4.2 Classification indicators
4.2.1 Regional floating dust weather
In the same weather process, patches of floating dust appear at 5 or more adjacent stations at the same time of observation. 4.2.2 Regional sand-blowing weather
During the same weather process, 5 or more adjacent stations experienced large-scale sand-blowing or sandstorms at the same observation time. 4.2.3 Regional sand-dust storm weather
During the same weather process, 3 or more adjacent stations experienced large-scale sand-dust storms at the same observation time. 4.2.4 Regional strong sand-dust storm weather
During the same weather process, 3 or more adjacent stations experienced large-scale strong sand-dust storms at the same observation time. 4.2.5 Regional extremely strong sand-dust storm weather
During the same weather process, 3 or more adjacent stations experienced large-scale extremely strong sand-dust storms at the same observation time. 2
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GB/T28591—2012
Wind force level
References
QX/T227—2014 Fog warning level
GB/T20480—2017
HKAoNhiKAca
GB/T20480-2017
People's Republic of China
National Standard
Sand and dust weather level
GB/T20480—2017
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