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Snow cover is an important factor in mountainous regions regarding water resources, vegetation and economic issues for the ski and spa resorts. Snow is also an indicator of the fluctuating climate, resulting from the change in the regime of winter precipitation and air temperature. This study is focused on the changes in the regime of the snow cover in the Vitosha mountain. The monthly values of number of days with snow cover, seasonal maximums and monthly averages of the snow cover from 5 meteorological stations ...

The NAO index has a strong influence on weather over West Europe and the Mediterranean basin but less prominent over the east part of Europe. The aim of this study is the assessment of the influence of the North-Atlantic oscillation on the snow cover conditions in Bulgaria. The winter (December thru March) station-based index of the NAO is used for the current survey as well as data for snow cover maximums from 10 meteorological stations, 4 of them mountainous, for the main period 1930-2020. The linear relation be...