Hydrological Dry Periods versus Atmospheric Circulations in the Lower Vistula Basin (Poland) in 1954–2018

Abstract The paper discusses the impact of atmospheric circulation on occurrence droughts. research includes mean monthly discharges for 7 rivers in 1954–2018. Dry periods were determined with Standardised Streamflow Indices (SSI-12). Additionally, type calendar Central Poland was used to determine indices: western zonal (W), southern meridional (S) and cyclonicity (C). analyses indicated a variation duration intensity droughts rivers. 2014–2017 driest period lowest SSI-12 most highest number extremely dry months. advection air from West South prevailed anticyclonic synoptic situations dominated over cyclonic types. Drought spells occurred at dominance circulation, inflow North increased circulation.