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Reduction of visibility in fog

Fig9.4.1-1: An example of HRES forecast fog distribution on right hand chart compared with the observed visibility on left hand chart (visibility as in coloured scale).  Forecast run data time 00UTC 23 January 2017 T+30 verifying at 06UTC 24 January 2017.  Thick fog, less than 100m visibility in places, caused problems over southern England.  Many flights were cancelled and others delayed.  In the early morning hours the fog was more widespread over England and Benelux countries.  HRES forecast visibility was too poor in some areas but provided good guidance to forecasters regarding areal extent of the fog risk. 

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