Changes in Precipitation Conditions in the Warm Half-Year in the Polish–Saxon Border Region in Relation to the Atmospheric Circulation

Precipitations are one of the most important factors affecting water resources in transboundary Polish–Saxon region. The main goal research was to examine multiannual changes precipitations April–September period 1971–2018, depending on circulation conditions, based Ojrzy?ska’s classification. analysis carried out meteorological data from Polish and German stations. results showed that precipitation totals intensive were observed under SW-A SW-C circulation, whereas anticyclonic types NE-A, NW-A mainly responsible for dry days occurrence. In terms changes, stations characterized by insignificant trends considered indices. Some positive lower hypsometric zones. mountains, a decreasing tendency dominated both precipitations, especially northern circulation. Furthermore, significant increase reported throughout region indices type, including totals, strong days. Considering trends, floods related heavy rains can intensify lowlands, while potential significantly limit