Lightning Location Information
Number of lightning strokes detected over the Hong Kong territory in the past hour (7:00p.m. - 7:59p.m.):
|Cloud-to-ground lightning: 0||Cloud-to-cloud lightning: 0|
Points to Note:
- The image shows cloud-to-ground or cloud-to-cloud lightning strokes as detected by the Lightning Location Network over the Pearl River Estuary
in the past 30 minutes. The lightning records are updated at 5-minute intervals.
Cloud-to-cloud lightning strokes are those detected strokes that did not reach the ground.
As such, they might not affect people or facilities on the ground. However, it should be noted that they may sometimes precede cloud-to-ground strokes.
The location as shown depicts roughly the starting point of the discharge from one cloud to the other.
- The above map can be zoomed into street level so that the lightning symbol may be displayed over a street or a building. Please note that the actual location of the lightning stroke may be more than several hundred metres away from the displayed position. Although the map can be scaled down to show other parts of the world, it will only display lightning location within the vicinity of Hong Kong.
- The network comprises seven stations jointly established by the Hong Kong Observatory, the Guangdong Meteorological Bureau and the Macao Meteorological and Geophysical Bureau. The stations are located at Chung Hom Kok, Tsim Bei Tsui, Sha Tau Kok in Hong Kong, Sanshui, Huidong and Yangjiang in Guangdong, as well as Taipa in Macao. (Click here to see the location of these stations)
- The Observatory has enhanced the Lightning Location Information System with new computer hardware and software. The enhanced system was put into operation at end May 2017. The accuracy of the enhanced system in determining the location of cloud-to-ground lightning strokes is about 200 to 300 m within the network when all stations are operative. The lightning detection efficiency, i.e. the probability that a stroke with peak current greater than a certain level can be detected by the network, is estimated to be more than 90%. The efficiency of cloud-to-cloud lightning detection is roughly 50%. The location accuracy and detection efficiency will be reduced when the lightning stroke occurs outside of the network or when not all of the stations are operative.
- There is no guarantee that all occurred lightning strokes can be detected and false detection of lightning strokes cannot be ruled out completely.
As it takes time for communication and computation, there is normally a delay of a few minutes in the display of data.
Other factors, including interruption to telecommunications services and power supply,
can also affect the reliability and availability of the lightning information.
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