De Villiers, Michael P.Van Heerden, Johan2016-12-092016-12-092001De Villiers, MP & Van Heerden, J 2001, 'Clear air turbulence over South Africa', Meteorological Applications, vol. 8, no. 1, pp. 119-126.1350-4827 (print)1469-8080 (online)10.1017/S1350482701001104http://hdl.handle.net/2263/58370Clear air turbulence (CAT) at high altitude remains a hazard to aviation which can result in passenger injury and aircraft damage. Two limited surveys of CAT events over South Africa, 1993-1995 (inclusive) and 1998, are used to illustrate the most likely synoptic conditions under which CAT can be expected. A case study of CAT associated with an upper-air trough and a mountain wave is presented. The study also evaluates the effectiveness of the Ellrod Turbulence Index (ETI) derived from model data provided by the UK Met. Office. A forecast of ETI derived from the Global Spectral Model of the United States National Center for Environmental Prediction (NCEP) is also reviewed.en© 2001 The Zoological Society of London. This is the pre-peer reviewed version of the following article : Clear air turbulence over South Africa, Meteorological Applications, vol. 8, no. 1, pp. 119-126, 2001. doi : 10.1017/S1350482701001104. The definite version is available at : http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1469-8080.Clear air turbulence (CAT)Passenger injury and aircraft damageSynoptic conditionsEllrod Turbulence Index (ETI)Postprint Article