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Hong Kong was shrouded in fog yesterday (March 6) and today (March 7) as a moist maritime airstream affected the region. The lowest visibility this morning was only 200 metres. With the use of weather satellite, it is possible to locate the fog from space.
During the day, fog can be seen with the naked eye. At night, however, observation of fog can prove difficult, particularly when there is no light around. The Hong Kong Observatory receives and processes satellite images from the Earth Observing Satellites (EOS) to assist weather forecasters in monitoring fog around Hong Kong. The sensors onboard the EOS take images of the earth using a number of infrared channels. After special processing of the satellite images, the location of fog can be highlighted in colour (Figure 1).
A few examples of fog episodes in 2006 can be found in the satellite gallery on the Hong Kong Observatory's website, which is accessible at http://www.weather.gov.hk/wxinfo/intersat/satellite_gallery/index_e.htm.
Ends/Tuesday, March 7, 2006
Issued at HKT 17:17
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