© George Anderson

Wokingham, England, United Kingdom of Great Britain and Northern Ireland

Latitude: 51° 25' 56'' N

Longitude: 0° 50' 38'' W

23 December 2007 0843 (Local Time)
Camera direction: towards W

Image P/S code: S.11.1.1

Image I.D.: 4698

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  Radiation fog

  Fog is a suspension of very small, usually microscopic water droplets in the air, reducing visibility at the Earth's surface. The term is used when the horizontal visibility is reduced to less than 1 km. In this picture, taken at Wokingham in southern England, UK, the visibility is only about 100 m.

  Radiation fog forms when the ground surface cools through radiation, usually at night, cooling the air just above the ground to its saturation temperature. On this occasion, a ridge of high pressure extended over southern England from an anticyclone centred over continental Europe.  

  Links in the image description will highlight features on the image. Mouse over the features for more detail.

  © George Anderson
  Wokingham, England, United Kingdom of Great Britain and Northern Ireland
  Latitude: 51° 25' 56'' N
  Longitude: 0° 50' 38'' W
  23 December 2007 0843 (Local Time)
  
  
  Camera direction: towards W
  Image P/S code: S.11.1.1
  Image I.D.: 4698
• 

  Fog

  Fog is a suspension of very small, usually microscopic water droplets in the air, reducing visibility at the Earth's surface. The term is used when the horizontal visibility is reduced to less than 1 km. In this picture the visibility is only about 100 m.

  The reduction in visibility depends on the structure of the fog, and especially on the number density and size distribution of the droplets. The structure may vary a great deal in time and space. However, in this particular example on the banks of the River Thames in Reading, England, UK at 1500 hours in the afternoon, the visibility changed only slowly and the fog persisted throughout the day. 

  A ridge of high pressure extended over southern England from an anticyclone centred over continental Europe.

  Links in the image description will highlight features on the image. Mouse over the features for more detail.

  © George Anderson
  Reading, United Kingdom of Great Britain and Northern Ireland
  Latitude: 51° 27' 41'' N
  Longitude: 0° 57' 58'' W
  23 December 2007 1500 (Local Time)
  
  
  Camera direction: towards W
  Image P/S code: P.11.1.1
  Image I.D.: 4697
• 

  Radiation fog

  Radiation fog is formed when the ground surface cools through radiation, usually at night under clear skies and light wind, cooling the air just above the ground to its saturation temperature. The fog is a suspension of very small, usually microscopic water droplets in the air that reduce the visibility at the Earth's surface. In this picture, the visibility is less than 100 m and the fog is deep enough that it forms a whitish veil that covers the landscape.

  During the night a showery trough crossed eastwards over southern England, UK, which lay in a weak ridge of high pressure, ahead of a frontal system approaching from the west.

  Links in the image description will highlight features on the image. Mouse over the features for more detail.

  © George Anderson
  Henley-on-Thames, England, United Kingdom of Great Britain and Northern Ireland
  Latitude: 51° 31' 53'' N
  Longitude: 0° 53' 29'' W
  14 January 2009 1103 (Local Time)
  
  
  Camera direction: towards SW
  Image P/S code: P.11.1.1.3
  Image I.D.: 5458