The WTWS algorithms, many of which utilize an analysis technique known as 'fuzzy logic', produce turbulence and windshear products based on sensor data. There is a small number of wind shear reports with magnitudes reaching 45 or even 50 kn. In general, for most years, there are 5–20 reports of severe wind shear each year. In comparison, the number of severe wind shear reports for departure is smaller than for the arrival corridors. Products had to support both tactical and strategic decision making and be updated fast enough to cover operations that occur every two minutes. For a more customized experience, please tell us your primary wind-related activity: All times Displayed are based on Hong Kong Airport local time. A Review of Progress and Applications of Pulsed Doppler Wind LiDARs. The WTWS provides real–time hazardous weather information to air traffic controllers and pilots to enhance safety in the terminal area and improve predictions of hazardous weather to support strategic decision making by air traffic managers. The WTWS development team included WITI, theNational Center for Atmospheric Research (NCAR), Hong Kong University of Science and Technology (HKUST), and the University of Wyoming. The Long-range 12 day forecast also includes detail for Hong Kong weather today. Significant terrain–induced windshear and turbulence will occur in episodes that are typically several days in duration and separated by several weeks.

In This Story. For the new runway being planned, there may be a runway corridor dedicated LIDAR, so that the updating of data over a particular runway corridor would be reduced to once every few seconds. Some typical cases of severe wind shear are also examined, such as observation by remote‐sensing instruments and flight data analysis. According to an internationally adopted definition (International Civil Aviation Organization, ICAO, 2013), wind shear refers to a headwind change of 15 kn or more at heights below 1600 ft. At Hong Kong International Airport (HKIA) (Figure 1), significant low‐level wind shear is reported once in every 400–500 flights and could be due to terrain‐disrupted airflow (the majority of cases), sea breeze, thunderstorms and low‐level jets.

Similar to model output statistics (MOS) techniques commonly used at major forecast centers, this algorithm provides 12–hour forecasts with 30–minute resolution of wind and turbulence at Chek Lap Kok. Don't have an account?

There are small areas of reverse flow embedded in the prevailing southerly winds (e.g. Alerts had to be reserved for significant events and assigned a priority. The purpose of the study is to document the characteristics of severe wind shear at an operating airport. The WTWS integrates data from various sensors and sources, including anemometers, Doppler weather radar, Doppler wind profilers, numerical weather prediction models and an array of global weather observations. OnSite Reports are crowdsourced (user-generated) wind and weather reports, contributed by real people via different applications. Timely alerts for severe wind shear are important as they might have greater impact on the operation of aircraft. Use the link below to share a full-text version of this article with your friends and colleagues. Example of an Alphanumeric Alarm Display (AAD) for Hong Kong. The LIDAR velocity image is shown in Figure 9(b).

Since 1998, the Hong Kong Observatory (HKO) has performed routine evaluations of the system and has made improvements to various sensing systems and wind shear and turbulence detection algorithms. Learn about our remote access options, Hong Kong Observatory, Kowloon, Hong Kong, China. A Cathay Pacific flight comes into land in Hong Kong's Kai Tak Airport, June, 27, 1998. On the surface, there is a ridge of high pressure over Low-level wind effects on the glide paths of the North Runway of HKIA: A wind tunnel study. Use website settings to switch between units at any time. Most wind shear reported by pilots at HKIA has a magnitude of 15–25 kn, accounting for 97.7% of all the reports received so far (since the opening of HKIA in 1998, up to 2015). This kind of terrain‐induced wind shear is quite common during a strong southerly wind. For the former report, the flight data show a transient change of headwind from −5 kn to +25 kn and then down to −3 kn. Most of the wind shear reports are concentrated at +30 kn. WindAlert has the latest weather conditions, winds, forecasts, nearby currents, and alerts for the area! the subjective nature of the wind shear reports (ICAO.

Pilot and photographer Daryl Chapman remembers the glory days and shares a few of the scariest moments. The surface isobaric chart of the event is given in Figure 7(a). Visibility.

A study of test flight results indicated that terrain–induced windshear and turbulence was not related to a single weather phenomenon and should be expected at any time of year. According to the caption, the photo was taken at 10:03am and shows the airport’s third runway in Chek Lap Kok, which is under construction. and you may need to create a new Wiley Online Library account. 11 kts. Nachts gibt es Regen bei Werten von 29°C. Modelling adverse meteorological conditions for aircraft arising from airflow over complex terrain, http://www.boeing.com/resources/boeingdotcom/company/about_bca/pdf/statsum.pdf. Sometimes, the pilot reports of wind shear may be based on wind trend information available onboard for certain fleets of aircraft. Rapid-testing capacity at Hong Kong airport allowed more than 12,000 tests to be carried out in 24 hours, and overall the company could process 500,000 of them in a month, he added. Digital flight data from Cathay Pacific B–747–400s operating at Hong Kong also were collected. Search the website. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username. the southeastern coast of China, bringing strong easterly winds to Hong Kong. The WTWS is providing windshear and turbulence alerts to pilots arriving or departing the airport when conditions warrant. The WTWS provides alerts for terrain–and convective–induced windshear and turbulence. The corresponding flight data are shown in Figure 6(c). For accurate detection and forecasting, much work still needs to be done enhancing existing technology. 14-day weather forecast for Hong Kong International Airport.

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