A brief introduction of aviation weather products in aamts website

1. A brief introduction of aviation weather products in www.aamts.orgwebsite Shen hong-xi Beijing aviation weather center of CAAC

2. Main contents • Flight Meteorological Documentation • Significant Weather Forecasts • Upper Wind & Temperature Forecasts • Aeronautical Meteorology Reports • Aeronautical Forecast Products • Icing & Turbulence • Tropopause Height & Temp • Max Wind Height & Temp • 0oC Height • Convective parameters • Convective parameters • Relative Humidity • Now & Future research

3. products introduction

4. Significant Weather Forecasts charts for Asia

5. the Significant Weather Forecasts charts for Asia • four times a day valid for 00,06,12 and 18 UTC • produced before their validity times approximately 6 hours • Height :above FL250 • Units: • wind speed: KT(knots) • movement speed: KMH • time: UTC • height: flight level(FL

6. High-level Significant Weather Forecasts charts The heavy dashed line indicates an area of forecast moderate clear turbulence (CAT) between fl260 and fl390 Jet stream with maximum wind speed of 130 knots at FL370 Isolated embedded cumulonimbus , less than 50%coverage,tops to FL490. You should expect moderate or greater turbulence unless noted.

7. High level chart symbols (example)

8. Forecast Wind And Temperatures Aloft Chart--Area

9. Forecast Wind And Temperatures Aloft Chart--Height

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12. Forecast Winds And Temperatures Aloft Chart • updated twice daily, forecasting from 6 to 24 hours • The flight levels of these charts are: FL530, FL450, FL400, FL340, FL300, FL240, FL180, FL100, • When the temperature less then 0, the minus before number is omitted. The other way round, the positive sign(+) is needed • Units: • wind speed: knot(KT). • temperature: Centigrade • air pressure: hPa • time: UTC • height: flight level(FL

13. Aviation Meteorology Reports

15. aviation weather products --icing icing forecast

18. Classical icing index II=[（RH-50）X2] X[T X（T+14）/-49]/10 In the formula, RH represents relative humidity，and T temperature。When the index is positive, it indicates isolated potential icing area, and probably icing region when icing index approachs to 10. Strongly recommended by ICAO

19. When 4>II≥0，light icing ； 7>II≥4，moderate icing； II≥7，severe icing Remarks：1、the index is recommended by ICAO; 2、the method has been put into operation for a long time

20. Case 1 A icing case occurred in the vicinity of Taiyuan airport,Shanxi province on 21,DEC,2004.It was reported by the captain of B-737 that they had encounted severe icing at the altitude between 1500 to 3000 meters high above the sea level.

21. Taiyuan airport based on above icing forecast formula

22. aviation weather products --Turbulence

23. aviation weather products --Turbulence Two Analysis Method: L-P Index Ellord Index

24. Turbulence — L-P Index

25. Turbulence — Ellrod Index

26. Case 2 Date: 2,Jan,2006 Time :0045UTC Where: Nanchengzi,HeBei province,China Height: 8400-9600m indensity : moderate to severe CAT

27. Turbulence place Turbulence — L-P Index

28. aviation weather products –Max Wind Speed Level

29. aviation weather products –Max Wind Speed Level Temperature

30. aviation weather products –Tropopause Height

31. aviation weather products –Tropopause Temperature

32. aviation weather products –Zero Centigrade Level Height

36. aviation weather products –Convective Parameters

37. Convective Parameter

38. Convective Parameter

39. Convective Parameter

41. Convective Parameter

42. Convective Parameter

43. Convective Parameter

44. Convective Parameter

45. Convective Parameter

46. Questions & Answers

47. Thank you for this opportunity to tell you about our program