Abstract:
A sample of twenty seven weather stations is used to estimate the heat stress risks in Bulgaria during the period 2003-2012. The values of Steadman’s heat index at primary or intermediate standard hours are used for this purpose. The range of the index is recoded into five levels of risk and the observations are cross-classified on stations and risk categories. Three frequency tables are produced and analyzed. The table for non-mountain stations and warm period May-October is biploted and stations are clustered according to risks. Geographical distribution of the heat stress risks is established. The heat waves during the period under consideration are discussed.