1. Detailed information of the windstorm, including latitude, longitude, classification and          the maximum wind gust near centre will be shown when placing the mouse cursor                over the analysed or forecast positions. The user can use the controls on the left of the        map to change the area of interest and to zoom into city or even street levels.                        Please bear in mind the uncertainty of the windstorms locations as described                          below in using this function.
2. While the forecast positions and track indicate the most likely future path of the                      windstorm, they may deviate from the actual path of the storm. Therefore, the probable      area within which the windstorm will fall with a probability of 70% are shown by the                yellow shading. Literally, it means that among 10 times of track forecast for similar                  situations, the windstorm will be centred within the indicated area in about 7 times. The        area grows as the forecast hour increases. It will be particularly larger beyond 48 hours        and is indicated with lighter shadings on the map. The size in terms of radius of the                'Potential Track Area' corresponding to different forecast hours are determined from              the error statistics of the forecasts issued in past years and are as shown in the                        following table: