The influence of atmospheric circulation on the occurrence of dry and wet periods in Central Poland in 1954–2018

Abstract This work presents the influence of atmospheric circulation on occurrence dry and wet periods in central Polish region Kujawy. The material which authors relied encompassed monthly totals precipitation obtained from 10 weather stations period 1954–2018. Both have been identified basis values Standardised Precipitation Index (SPI). Additionally, calendar types over Central Poland was used to determine indices: western (W), southern (S) cyclonicity (C). analyses indicated that concerned experiences low comparison with rest Poland. According indices W, S C, for Poland, air mass advection West prevails East. Moreover, a slightly more frequent inflow South than North has observed. frequency anticyclonic situations is higher cyclonic this part Europe. Drought spells occurred study area at clear dominance circulation, mostly increased westerly circulation. On other hand, mainly influenced by during masses West. Dry accounted 28% 27% period, respectively.