GB/T 40243-2021 English PDF

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GB/T 40243-2021: Tornado intensity scale
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 40243-2021	189	Add to Cart	3 days	Tornado intensity scale	Valid

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Basic data

Standard ID: GB/T 40243-2021 (GB/T40243-2021)
Description (Translated English): Tornado intensity scale
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A47
Word Count Estimation: 10,118
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 40243-2021: Tornado intensity scale

---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.
Tornado intensity scale ICS 07.060 CCSA47 National Standards of People's Republic of China Tornado intensity rating Released on 2021-05-21 2021-12-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Tornado recognition 2 5 Classification 2 Appendix A (informative) Wind speed calculation table based on disaster indicators and the degree of damage 4 Reference 7

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 of Standardization Documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the China Meteorological Administration. This document is under the jurisdiction of the National Standardization Technical Committee for Meteorological Disaster Prevention and Mitigation (SAC/TC345). Drafting organizations of this document. Chinese Academy of Meteorological Sciences, National Meteorological Center, Foshan Tornado Research Center. The main drafters of this document. Yao Pan, Liang Xudong, Sun Jisong, Zheng Yongguang, Zhou Qingliang, Li Cailing, Cai Kanglong, Li Zhaoming. Tornado intensity rating

1 Scope

This document specifies the identification rules and intensity levels of tornadoes. This document is applicable to tornado monitoring, early warning, identification, rating and scientific research.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Tornado tornado Tornado A rapidly rotating column of air extending from the base of a cumulus cloud to the land or water surface. Note. It often appears as a funnel-shaped cloud. 3.2 Funnelcloud A cloud extending downward from a cumulus cloud, usually in the shape of a funnel and accompanied by a rotating column of air. Note. When the rotating air column is grounded, it is a tornado. 3.3 Convectivestorm A weather system composed of cumulonimbus clouds. Note. It is often accompanied by thunder and lightning, strong winds, and heavy rainfall, sometimes hail, torrential currents and even tornadoes. 3.4 Gustwindspeed The maximum instantaneous wind speed on the ground at a certain moment caused by a tornado (3s average wind speed). 3.5 Radial velocity The component of the wind vector along the radial direction of the radar. Note. It is also called Doppler velocity in Doppler weather radar observations. 3.6 Tornadicvortex signature; TVS The radial velocity characteristics of the swirling airflow near the center of the tornado on the Doppler weather radar. Note. Usually cyclonic, manifested as a strong cyclonic tangential velocity pair between adjacent azimuth pixels on the radar radial velocity field. 3.7 Mesocyclone A cyclonic rotating vortex with a horizontal diameter of 2km~10km appears in a convective storm. ......

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