A typical feature of the lowered snow line phenomenon is the significant fluctuation in the snow line within the same air mass and between closely located areas. In such cases, the snow line appears locally much lower than forecast. The present Master's thesis presents the many factors and weather conditions that can lead to the aforementioned phenomenon, the most important of which are the intensity of precipitation and blocking of the wind, as they contribute most to latent cooling. A typisation of the lowered snow line phenomenon is designed on the basis of the logged weather conditions at the time of the occurrence of the phenomenon in the Alpine valleys of the Julian Alps. All logged occurrences are classified into three distinct types of the phenomenon on the basis of the weather condition; each type is described in detail using individual occurrences as examples. Temperature measurements in a two-year period at sixteen (from December 2015 to end of April 2016) or seventeen (from December 2016 to end of April 2017) locations in the valleys of Planica, Vrata, Zadnjica, and Loška Koritnica, slopes of Karavanke–Peč (The Triple Border, slo. Tromeja), and Luknja Saddle constitute the basis for the detailed descriptions. The temperature measurements served not only as the basis for the typisation but also for determining the valleys’ suitability for studying the phenomenon.
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