Heathrow Community Noise Forum

Transcription

1 Heathrow Community Noise Forum James Shapland Met Office Heathrow Ops Manager 06 th July

2 Contents Typical UK synoptic setup Impacts of friction on wind speed / direction Contrast of the 3000 FT wind and surface wind Other factors that may impact wind direction Wind forecasts for Heathrow Airport

3 Typical UK synoptic setup Westerly winds across the UK Direction of 2000 FT wind

4 Typical UK synoptic setup Easterly winds across the UK Direction of 2000 FT wind

5 Typical UK synoptic setup Southerly winds across the UK Direction of 2000 FT wind

6 Typical UK synoptic setup Northerly winds across the UK Direction of 2000 FT wind

7 Variations in wind speed

8 Variations in direction

9 Alteration of 2000 FT wind

10 Impacts on the surface wind Westerly winds across the UK Direction of 2000 FT wind Direction of surface wind

11 Impacts on the surface wind Easterly winds across the UK Direction of 2000 FT wind Direction of surface wind

12 Impacts on the surface wind Southerly winds across the UK Direction of 2000 FT wind Direction of surface wind

13 Typical UK synoptic setup Northerly winds across the UK Direction of 2000 FT wind Direction of surface wind

14 Small scale features Sea Breeze Occur during the summer months. Temperature differences between the sea and the land form pressure differences, and a wind to develop. Heathrow is within the inland extent of sea breezes. Can cause the wind to become S rly or SE rly.

15 Small scale features Sea Breeze

16 Small scale features Showers / Thunderstorms Showers cause down droughts, that alter the wind direction around them. Slow moving showers can cause long changes in a wind direction that may cause a runway change Recent case study from 10 th of July Showers caused a sudden runway change

17 A large CB caused weather avoidance on approach and downdroughts flicked the E ly wind to W ly 8-12 KT CB developed in 30 minutes just to west of Windsor Moving away NNE very slowly

18 Small scale features Katabatic Winds Overnight, high ground generally cools quicker than lower ground. Cold air is dense, and flows down hills. Heathrow is located SE of the Chilterns. Heathrow can get NW rly winds when not expected. These winds normally disappear 1-2 hours after sunrise.

19 Small scale features Katabatic Winds Cold air drains from the Chilterns, temporarily bringing NW rly surface winds to Heathrow

20 Wind Forecasting Forecast products for planning and tactical decision making Onsite equipment for wind monitoring Aircraft demand for 5 KT or less tailwind.

21 Surface Winds: 2100 Z & 0400 Z KT KT Crown copyright 2016 Met Office

22 3000 FT Winds: 2100 Z & 0400 Z KT KT Crown copyright 2016 Met Office

23 Heathrow Operational Brief - Wind Update for Issued on Tuesday, 07 June 2016 at 02:31 local time Winds Tuesday, 07 June 2016 LRP Gusts Date SFC 3000 FT L S Time (z) RWY COMMENTS V LRP F (nm) DIR SPD DIR SPD P C Spacing Gust SPD Gust LRP Av. LRP PROB20 SHRA TSRA CB PROB20 SHRA TSRA CB /06/16 Tue PROB10 SHRA TSRA CB PROB40 +SHRA TSRAGR CB PROB40 +SHRA TSRAGR CB PROB40 +SHRA TSRAGR CB PROB30 +SHRA TSRAGR CB PROB20 SHRA TSRA CB Low risk LVP Z /06/16 Wed PROB10 SHRA TSRA CB PROB10 SHRA TSRA CB /06/16 Thu /06/16 Fri 11/06/16 Sat PROB20 EMBD CB PROB20 EMBD CB (C) Crown Copyright All Rights Reserved. TO THE FULLEST EXTENT PERMISSIBLE BY LAW NATS EXCLUDES ANY LIABILITY RELATING TO THIS OPERATIONAL BRIEF. NATS DOES NOT WARRANT THAT THE OPERATIONAL BRIEF: (1) IS FIT FOR ANY PARTICULAR PURPOSE; (2) WILL MEET THE USERS REQUIREMENTS; OR (3) WILL BE ERROR- Crown copyright 2016 Met Office

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25 Wind Observing NATS observations 2 x anemometers to measure wind speed and direction Screens in APOC and tower.

26 Area winds

27 Onsite Wind Profiler - Trial

28 Any Questions?