A momentous inference of heat waves is the economic effect. The main demage after the human problems will caused by theeseextreme events in agriculture. For example a long hot peiod without any percipitation can exterminate not only the annual yield, but also itcan demage or in extreme situation it can destroy the whole orchard. Especially endangered most of the fruits, because an extreme summerwith high temperature which usually goes hand in hand with an arid period can modify growth of the plant. Our investigations show thataccording to the most widely accepted climate change scenarios heat waves are expected to be essentially longer and hotter than in the past.It might happen that events we now define as heat waves last through entire summer. Although it will not be general, the length and intensityof present heat waves could also multiply. Based on data provided by some global circulation models, we might be face an event that exceedsthe hottest heat waves of the 20th century by as much as 12 °C. This study also offers a survey of the methodology of heat wave definition.Besides traditional calculations, we present two unconventional methods by introducing minimum and maximum temperature heat waves.Weshow in what points this approach is different from those usually adopted and what extra information it may offer.As an extension of the usualstudies, with considering the length of events, we analyse the development of two variants – temperature and duration – and, as a result,classify the extreme heat events according to both length and intensity
