More computer model forecast products available on “Earth Weather”
30 June 2025
The Observatory today (30 June 2025) enhanced the contents of the “Earth Weather” webpage with the addition of products from the artificial intelligence (AI) weather forecast model “Fengwu”, including 15 days forecasts of surface winds, temperature, mean sea level pressure, rainfall, as well as upper-air winds, temperature, relative humidity, and geopotential height.
Besides, to enable the public to understand the weather changes more comprehensively, forecasts of “Area of Potential Thunderstorm” for the East Asia region have also been added to the webpage. This forecast product is generated by the Observatory using outputs from the European Centre for Medium-Range Weather Forecasts (ECMWF) Ensemble Prediction System, indicating areas with higher potential of thunderstorm development at different times.
The address of the “Earth Weather” is https://maps.hko.gov.hk/wxviewer/index.html?lang=en. The new feature will also be added on the “MyObservatory” app in upcoming update.
For details about the “Fengwu model”, please refer to Notes of the Earth Weather webpage.
Besides, to enable the public to understand the weather changes more comprehensively, forecasts of “Area of Potential Thunderstorm” for the East Asia region have also been added to the webpage. This forecast product is generated by the Observatory using outputs from the European Centre for Medium-Range Weather Forecasts (ECMWF) Ensemble Prediction System, indicating areas with higher potential of thunderstorm development at different times.
The address of the “Earth Weather” is https://maps.hko.gov.hk/wxviewer/index.html?lang=en. The new feature will also be added on the “MyObservatory” app in upcoming update.
For details about the “Fengwu model”, please refer to Notes of the Earth Weather webpage.
When users select rainfall forecasts for the ECMWF model, the “Area of Potential Thunderstorm” forecast will be simultaneously displayed with lightning symbols. The example above shows the forecast for 2:00 pm Hong Kong Time on May 29, 2025 made on May 21, indicating a relatively high probability of thunderstorm development along the coast of southern China under the influence of a trough of low pressure.