GB/T 21984-2017Short-range weather forecast (English PDF)

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").

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.

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.