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Wind shear alerting at Hong Kong International Airport. S.Y. Lau Hong Kong Observatory. In Hong Kong…. Significant windshear : 1 in 500 flights 5 typical causes Winds blowing across terrain (terrain-induced) Sea breeze Gust fronts Microbursts Low-level jets.

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Wind shear alerting at hong kong international airport l.jpg

Wind shear alerting at Hong Kong International Airport

S.Y. Lau

Hong Kong Observatory

WMO Symposium

Toulouse 2005


In hong kong l.jpg

In Hong Kong…

  • Significant windshear : 1 in 500 flights

  • 5 typical causes

    • Winds blowing across terrain(terrain-induced)

    • Sea breeze

    • Gust fronts

    • Microbursts

    • Low-level jets

WMO Symposium

Toulouse 2005


Slide3 l.jpg

WMO Symposium

Toulouse 2005


Winds blowing across terrain terrain induced l.jpg

Winds Blowing Across Terrain (Terrain-induced)

  • In lighter wind conditions, low-level temperature inversion also triggers windshear (spring months)

  • Windy occasions like during TC…

WMO Symposium

Toulouse 2005


Equipment suite l.jpg

Equipment along runway

TDWR

Weather Buoys

LIDAR

Equipment suite

WMO Symposium

Toulouse 2005


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LIDAR Scanner

ATCX Building Roof-top

LIDAR – Fully Operational in Mid-2004

Installed in mid-2002

IR (2 μm) → eye-safe

WMO Symposium

Toulouse 2005


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Shear line

Shear line

Radial shear algorithm

Shear line discernible on LIDAR velocity picture

Shear line identified by algorithm

WMO Symposium

Toulouse 2005


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Hazard Coverage Area

WMO Symposium

Toulouse 2005


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Hazard Coverage Area

Red: Arrival - 1.0 deg PPI. Departure - 4.5 deg PPI

Blue: Arrival - 0.0 deg PPI. Departure - 1.0 deg PPI

WMO Symposium

Toulouse 2005


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Glide-path Scan

laser beam

N

glide path

WMO Symposium

Toulouse 2005


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30 March 2005Synoptic pattern

Hong Kong

WMO Symposium

Toulouse 2005


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Ascent from King’s Park

4.7°C

WMO Symposium

Toulouse 2005


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Locally around HKIA

WMO Symposium

Toulouse 2005


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4

3

1

5

2

Temperature

WMO Symposium

Toulouse 2005


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LIDAR animation

WMO Symposium

Toulouse 2005


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LIDAR 1.0 degree PPI scan at 0049 UTC 30 March 2005

  • 45 WS reports (00 – 03 UTC):

    0005 07RA -15 KT 4NM

    0029 07RA -30 KT 1NM

    0032 07RA 35 KT 1NM

    0045 07RA 25 KT 1NM

    0049 07LA -20 KT 2NM

Cold colours(blue, green) – moving towards LIDAR

Warm colours (yellow, orange, pink) – moving away from LIDAR

WMO Symposium

Toulouse 2005


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RAGA …

WMO Symposium

Toulouse 2005


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0° elevation

PPI scans

Glide Path Scan at 00:48 UTC

ElevationAzimuth

2.2° 63.9° –

-1.0° 4.05°

ElevationAzimuth

2.3° 75.5° –

0.0° 91.3°

ElevationAzimuth

2° 255.8° –

-1.0° 271.3°

ElevationAzimuth

2° 247.0° –

-0.9° 236.3°

WMO Symposium

Toulouse 2005


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GLYGA …

WMO Symposium

Toulouse 2005


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Wind direction, speed and headwind derived from on-board data from aircraft arriving at 0049 UTC.

24KT

GLYGA

head wind

profile

WMO Symposium

Toulouse 2005


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Pilot-

centered

Equipment-

centered

WMO Symposium

Toulouse 2005


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WMO Symposium

Toulouse 2005


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WMO Symposium

Toulouse 2005


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2nd peak

1st peak

Frequency Distribution by Month

  • Significant windshear: 1 in every 500 flights

  • Significant TURB: 1 in every 2,000 flights

WMO Symposium

Toulouse 2005


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Windshear algorithms for automatic alerting based on LIDAR data

  • Radial shear Alert Generation Algorithm (RAGA) - Adaptation of TDWR approach (shear along radar beams)

  • GLIde path shear alert Generation Algorithm (GLYGA) – Shear along glide paths

WMO Symposium

Toulouse 2005


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