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GB/T 21984-2017: Short-range weather forecast
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 21984-2017	English	279	Add to Cart	3 days [Need to translate]	Short-range weather forecast
GB/T 21984-2008	English	479	Add to Cart	3 days [Need to translate]	Short-range weather forecast

GB/T 21984-2017: Short-range weather forecast

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Short-range weather forecast ICS 07.060 A47 National Standards of People's Republic of China Replacing GB/T 21984-2008 Short-term weather forecast 2017-09-07 Posted 2018-04-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 21984-2008 "short-term weather forecast." Compared with GB/T 21984-2008, in addition to editorial changes outside the main The technical changes are as follows. --- Removed "total cloud amount" "total cloud level" "weather meeting" "numerical weather forecast" and other terms and definitions (2008 version 2.7, 2.8, 2.19 and 2.21); --- Increase the "average temperature" "cloud amount" "cloud base height" "air pressure" "forecast time resolution" terms and definitions (see 2.5, 2.8, 2.9, 2.20 and 2.22); --- Modify the "visibility" terms and definitions (see 2.19,.2008 version 2.18); --- Modify the forecast elements of the short-term weather forecast and forecast time resolution content (see 3.2 and 3.3,.2008 edition 3.2 and 3.3); --- Removed the forecast production and short-term weather forecast release content (2008 edition Chapter 4 and Chapter 5); --- Modify the normative Appendix B "sky condition terms and cloud amount comparison table" (2008 edition of normative Appendix B "cloud division table"); --- Modify the information appendix C "Wind direction diagram" (2008 version of Figure 1 wind direction diagram shows the method); --- Added information Appendix D "wind direction and degree table"; --- Modify the informative Appendix E "Precipitation classification table" (2008 edition of the appendix C "Precipitation classification table"). This standard is proposed by China Meteorological Administration. This standard by the National Meteorological Disaster Prevention and Mitigation Standardization Technical Committee (SAC/TC345) centralized. This standard was drafted by Hainan Provincial Meteorological Bureau and National Meteorological Center. The main drafters of this standard. Xinji Wu, Sun Jun, Xu Xiangchun, Hao Liqing, Wang Xidong, Guo Dongyan, Chen Youlong. This standard replaces the standards previously issued as. --- GB/T 21984-2008.

Introduction

Short-term weather forecast is forecasters based on past and present atmospheric conditions, the use of modern forecasting techniques and methods, the use of weather science, Weather dynamics, statistics and other knowledge of the future 0h ~ 72h of a region of the atmospheric state and the possible impact of forecasting and release. GB/T 21984-2008 Since the implementation of the "short-term weather forecast", it has played an important role in regulating and guiding the national short-term weather forecasting business effect. In order to meet the development needs of short-term weather forecast in our country, GB/T 21984-2008 is revised. This revision mainly increased or decreased Some definitions and terms, revised forecast elements of short-term weather forecasting and forecast time resolution content, add some informative appendix. Short-term weather forecast

1 Scope

This standard specifies the terms and definitions of short-term weather forecasting, forecast aging, forecast elements and forecast time resolution. This standard applies to the production and use of short-term weather forecasts.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Pre-estimation and forecast of weather changes in a certain area or place in the next 72 hours. 2.2 Sky condition skycondition The amount of clouds in the sky, the properties of clouds, the height of clouds and other atmospheric conditions. 2.3 Weatherphenomenon Occurred in the atmosphere, some of the physical phenomena on the ground. It includes precipitation phenomenon, ground condensation phenomenon, visual obstacle phenomenon, lightning phenomenon And other phenomena. [QX/T 48-2007, Definition 3.1] 2.4 Temperature airtemperature The degree of air hot and cold physical quantity. Note. The standard temperature is in a standard environment in the veranda from the ground about 1.5m high temperature measuring instrument measured air temperature, in degrees Celsius (℃), take a decimal place, below 0 ℃ is negative. 2.5 Average temperature meanairtemperature The average temperature over a period of time. The unit is degrees Celsius (℃). 2.6 The maximum temperature maximumairtemperature The maximum temperature of a certain period of time. The unit is degrees Celsius (℃). 2.7 Lowest temperature minimumairtemperature The minimum temperature of a certain period of time. The unit is degrees Celsius (℃). 2.8 Cloud cover cloudcover The clouds cover the sky into the number. 2.9 Cloud base height cloudbaseheight The vertical distance from the cloud base to the ground of the station. The unit is meters (m). ...