Authors: A Valeriánová L Crhová E Holtanová M Kašpar M Müller J Pecho
Publish Date: 2015/09/03
Volume: 127, Issue: 1-2, Pages: 17-29
Abstract
Our research focuses on the analysis of extreme high maximum air temperature events EXHTEs in the Czech Republic in the period 1961–2010 their climatological characteristics and on the identification of synopticscale circulation conditions conductive to them EXHTEs are detected using the Weather Extremity Index WEI combining return periods of daily maximum air temperature duration of events and the extent of the affected area We selected 37 EXHTEs as nonoverlapping periods with the highest WEI Some long EXHTEs were divided into several shorter synoptically homogeneous episodes Using the twolevel divisive clustering of 700 hPa air temperature and wind field anomalies we obtained four main variants of synopticscale circulation conditions The most frequent variant associated with extreme episodes is characterized by a westerly flow connected with a high pressure ridge extending northeastward from North Africa over Central Europe or with an anticyclone centered over the Central Mediterranean The most extreme episodes occurred during the variant characterized by an easterly flow between a high pressure area to the northeast and a low pressure area to the southeast
Keywords: