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Basic dataStandard ID: GB/T 32935-2025 (GB/T32935-2025)Description (Translated English): Grade of global tropical cyclones Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A47 Classification of International Standard: 07.060 Word Count Estimation: 14,143 Date of Issue: 2025-04-25 Date of Implementation: 2025-08-01 Older Standard (superseded by this standard): GB/T 32935-2016 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 32935-2025: Grade of global tropical cyclones---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.ICS 07.060 CCSA47 National Standard of the People's Republic of China Replaces GB/T 32935-2016 Global tropical cyclone scale Released on 2025-04-25 2025-08-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of contentsPreface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Global tropical cyclone classification method 1 4.1 Monitoring sea areas 1 4.2 Division rules 1 4.3 Division indicators 1 5 Classification of tropical cyclones in different sea areas around the world 1 5.1 Northwest Pacific and South China Sea 1 5.2 South Pacific and waters near Australia 2 5.3 North Indian Ocean 2 5.4 Southwest Indian Ocean 3 5.5 North Central Pacific, Northeastern Pacific and North Atlantic (Caribbean Sea and Gulf of Mexico) 3 Appendix A (Normative) Division of Global Tropical Cyclone Monitoring Areas 4 Appendix B (Normative) Chinese-English Comparison Table of Global Tropical Cyclone Grade Names 5 References 7ForewordThis 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 32935-2016 Global Tropical Cyclone Scale. Compared with GB/T 32935-2016, in addition to structural adjustments and In addition to editorial changes, the main technical changes are as follows. --- Added the rules for the classification of tropical cyclone intensity when a tropical cyclone moves from one sea area to another (see 4.2); --- Added tropical cyclone classification indicators (see 4.3); --- The tropical cyclone classification in the South Pacific and the waters near Australia was deleted (see 3.2.2 and 3.2.3 of the.2016 edition); --- Changed other relevant information corresponding to the maximum average wind speed near the bottom center (see 5.1~5.5, 3.2.2~3.2.6 of the.2016 edition); --- Changed the sea areas that adopt the same standard for tropical cyclone classification (see 5.2, 3.2.2 and 3.2.3 of the.2016 edition); --- Added some tropical cyclone grades (see 5.2, 5.3, 5.5, Appendix B); --- Changed the range of maximum wind speed near the center corresponding to some tropical cyclone levels (see 5.3, 5.4, 3.2.4, 3.2.5 of the.2016 edition); --- Changed the name of the tropical cyclone area in the southwest Indian Ocean (see 5.4, 3.2.5 of the.2016 edition); --- Added the normative appendix "Global tropical cyclone monitoring sea area division" (see Appendix A); --- Added the normative appendix "Chinese-English comparison table of global tropical cyclone grade names" (see Appendix B). 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 the National Technical Committee for Standardization of Meteorological Disaster Prevention and Mitigation (SAC/TC345). This document was drafted by. National Meteorological Center. The main drafters of this document are. Lv Xinyan, Dong Lin, Qian Qifeng, Zhao Wei, Xu Yinglong and Gao Shuanzhu. The previous versions of this document and the documents it replaces are as follows. ---First published in.2016 as GB/T 32935-2016; ---This is the first revision. Global tropical cyclone scale1 ScopeThis document defines the classification of tropical cyclones in various ocean areas around the world. This document applies to operations, services and scientific research on tropical cyclones.2 Normative referencesThe contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 19201-2006 Tropical cyclone scale3 Terms and definitionsThere are no terms or definitions that require definition in this document.4 Global tropical cyclone classification method4.1 Monitoring sea areas According to Appendix A, the global tropical cyclone monitoring areas are divided into the Northwest Pacific and South China Sea, the South Pacific, the waters near Australia, the North Indian Ocean, and the South China Sea. There are eight geographical regions corresponding to the Indian Ocean, Southwest Indian Ocean, North Central Pacific Ocean, Northeast Pacific Ocean, and North Atlantic Ocean (Caribbean Sea and Gulf of Mexico). 4.2 Division rules When a tropical cyclone moves from one sea area to another, the tropical cyclone level is divided according to the tropical climate in the sea area where the tropical cyclone center is located. The grade of rotation is divided into different levels. The tropical cyclone grades in the Northwest Pacific and South China Sea should be classified according to the provisions of GB/T 19201-2006. Cyclone levels should be classified according to the level regulations of the World Meteorological Organization's tropical cyclone regional professional meteorological forecast centers. The Chinese and English names of the global tropical cyclone levels should comply with the provisions of Appendix B. 4.3 Division indicators The tropical cyclone grade is divided according to the maximum average wind speed near the center of the bottom layer (10m). Note. The average time of wind speed in different sea areas is different. 5.Classification of tropical cyclones in different sea areas around the world 5.1 Northwest Pacific and South China Sea The classification of tropical cyclones in the Northwest Pacific and the South China Sea should comply with the provisions of Table 1. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 32935-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 32935-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 32935-2025?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 32935-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
