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on behalf of WMO by

Hong Kong Observatory
of Hong Kong, China.
  Global distribution of Fog - Explanatory notes
Fog web page features
When a station reported fog, a symbol would be shown on the world map on the front page. Symbols of different shapes and colours are used to indicate whether the observation was reported in the most recent synoptic hour or reported 6, 12, 18 or 24 hours earlier.
reported at the latest synoptic hour;
reported 6 hours earlier;
reported 12 hours earlier;
reported 18 hours earlier;
reported 24 hours earlier.
 
  • Click here to view Fog
In the zoom-in maps, fog icons are used to indicate the location of fog occurrence.
reported at the latest synoptic hour;
reported 6 hours earlier;
reported 12 hours earlier;
reported 18 hours earlier;
reported 24 hours earlier.
 
Clicking or putting the mouse cursor over a fog icon will open a window showing the reporting station(s) around that location. List of stations reporting fog in the past 24 hours, the corresponding country and the location of the stations in latitude and longitude units, could be viewed by clicking on the corresponding links below the map.
 

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Source of data
The weather observations are extracted from Members' SYNOP reports submitted to WMO through the GTS.
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