| Notes: |
1. |
This map shows the visibility readings in Hong
Kong Waters at the indicated hour. The readings are provided by the
Hong Kong Observatory (HKO) and Marine
Department respectively. |
| |
2. |
The visibility readings for Hong Kong Observatory,
Chek Lap Kok, Central and Waglan Island are provided by HKO. The visibility
at Hong Kong Observatory is based on hourly observations by a trained
meteorological observer. The visibility at Chek Lap Kok, Central and
Waglan Island are derived from automatic visibility readings of a visibility
meter and represents the average of readings in the 10 minutes ending
at the indicated time. |
| |
3. |
The visibility at Chek Lap Kok is provided by the visibility meter near the middle of the south runway of the Hong Kong International Airport. When this visibility meter cannot provide data, the visibility value will come from one of the neighbouring meters at the airport. |
| |
4. |
The other readings shown on the map are collected
by the Marine Department from voluntary ship observers and are available
only when low visibility caused by fog, mist or haze occurs within Hong
Kong waters. The readings are for reference only and the box at the
lower left corner of the map, if shown, indicated the data collection
time. |
| |
5. |
The reported visibility ranges between 100 metres and 50 kilometres.
A visibility report of 100 metres refers to visibilities of 100 metres
or less and, 50 kilometres refers to visibilities of 50 kilometres or
more. “N/A” is displayed when no reading is available. |
| |
6. |
On the time series charts below, logarithmic scale is used to facilitate
reading, especially at low visibility values. |
| |
7. |
Despite quality control, the automatic visibility reading may occasionally
be affected by noises and interferences. |
