VHHH windshear and turbulence information
August 24, 2024
Reference:
https://www.hko.gov.hk/en/aviat/articles/files/booklet_4th_edition.pdf
Two ways to deliver W/S or TURB information in VHHH
Warning – via Voice-ATIS, Digital-ATIS (D-ATIS)
Alert – generated automatically by the real time “up-to-the-minute” Windshear and Turbulence Warning System (WTWS), but passed to the aircraft via ATC
Two levels of of Windshear alerts
- Microburst alert (MBA) –
expect headwind loss of 30KT or greater AND precipitation is present (only be generated by the TDWR) - Windshear alert (WSA) –
- expect headwind loss or gain of 15 KT or greater ; OR
- headwind gain of 30KT or greater ; OR
- headwind loss of 30KT or greater, BUT NO precipitation present
Notes: 天文台指出MBA 純粹代表由TDWR detect 到有wind loss of 30KT AND with precipitation present – 並不代表係典型microbust~
Two common levels of Turbulence alerts
- Severe turbulence alert
- EDR 0.5 or above
- Moderate turbulence alert
- EDR 0.3 – 0.5
Important:
- HKO WTWS use weather sensor to continuously monitor possible occurrence of turbulence within 3NM of the runway thresholds
- EDR with reference to heavy category aircraft (i.e A330, B777)
值得留意既係, somehow WTWS 有限制,對airrival and departure corridor 既coverage 都有不同:
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