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In this issue of Weather

The October 2016 issue of Weather begins on p. 241 with ‘A test of visibility sensors at Hong Kong International Airport’ by Pak‐Wai Chan. Visibility is one of three observed features of weather that are significant to aviation, so the choice of a reliable accurate sensor, able to reproduce visibility as observed by humans – at least when obscurity removes our ability to see objects 10km or less away – is essential. There has been much development in both transmissometers and forward‐scatter meters to measure visibility in recent years and this paper provides useful insight into relative performance that can be applied in many situations.