GB/T 20480-2025Classification of sand and dust weather (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document replaces GB/T 20480-2017 "Sand and Dust Weather Grades". Compared with GB/T 20480-2017, except for structural adjustments and editing In addition to the changes in performance, the main technical changes are as follows.

a) Change the terms “weather process” and “visibility” to “dust weather process” and “horizontal visibility” (see 3.2 and 3.3, 2017 edition).

2.2, 2.3), the terms “National Basic Meteorological Station” and “National Reference Climate Station” were deleted (see 2.5 and 2.6 of the 2017 edition);

b) The "single-station dust level" was changed to "single-location dust weather level", and the horizontal visibility index requirements in the level classification were changed (see Chapter 4, Chapter 3 in the 2017 edition).

c) Change “Regional dust weather level” to “Dust weather process level” (see Chapter 5, Chapter 4 of the 2017 edition), change The classification basis and levels were revised (see 5.1, 4.1 of the 2017 edition); "regional dust weather" was deleted (see 4.2.1 of the 2017 edition).

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed by the China Meteorological Administration.

This document is under the jurisdiction of China Meteorological Disaster Prevention and Mitigation Standardization Technical Committee (SAC/TC345).

This document was drafted by: National Meteorological Center, National Climate Center, Forestry and Grassland Survey and Planning Institute of the State Forestry and Grassland Administration, China Meteorological Administration, National Forestry and Grassland Administration (National Park Administration).

The main drafters of this document are: An Linchang, Yang Mingzhu, Sun Tao, Wang Bang, Wen Ping, Liu Xusheng, Gui Hailin, Wang Jikang and Zhang Bihui.

The previous versions of this document and the documents it replaces are as follows.

— First published in 2006 as GB/T 20480-2006, first revised in 2017;

— This is the second revision. Dust weather level

1 Scope

This document stipulates the sandstorm weather levels at single locations and the sandstorm weather process levels.

This document is applicable to the monitoring, forecasting, warning, assessment, services and scientific research of sandstorm weather.

2 Normative references

This document has no normative references.

3 Terms and definitions

The following terms and definitions apply to this document.

4 Single-location sandstorm weather level