Assessing Visibility Visibility is of major importance for safe functioning of transport systems, especially aircraft, motor vehicles and shipping. Most major accidents occur at times when visibility is reduced by fog, snow, heavy rain, spray, etc. Assessing visibility, however, is not an easy task. The simplest method involves selecting easily identified objects in the landscape at specified distances from the weather station. Depending on whether a chosen object can be clearly seen, the point on the Met Office visibility scale can be recorded.
In the table below, the values in the left columns A to K should be substituted with objects of known distance from the station.
|Object||Standard Distance||Visibility Description||Visibility Code|