Frequency Changes of Weather Types in the Alpine Region since 1945

摘要: The annual occurrence of different weather types Schuepp’s synoptic classification in the Alpine region has significantly changed since beginning its recording 1945. frequency (number days per year) shifted towards more convective and less advective types. Since 1945 number long-lasting episodes rose lessened. Most these changes took place winter. frequencies mean certain local meteorological parameters are correlated. On large scale there is a strong interdependence between high pressure type North Atlantic Oscillation (NAO) index which based on sea-level difference Portugal Iceland.