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EN
The paper attempts an evaluation of the variability of frosty days (t,.", < Q0C) and' days with severe frost (t,.", <-IQ°C) in Cracowand Prague for the period 1845/46-1995/96 in relation to the atmospheric circulation factors. The correlation coefficient for the numbers of frosty days in Cracow and Prague is higher than the same coefficient for the numbers of days with severe frost. Both frosty days and days with severe frost occur most often together with high pressure centre and anticyclonic wedge in Central Europe and also with high pressure centre over Scandinavia. Recently there is a decreasing tendency in the occurrence of both types of days, which is the result of the atmospheric circulation and anthropogenic factors.
EN
Meteotropic situations are defined as weather that may affect human health and exacerbate diseases, especially in sensitive persons. The main objective of the paper is to determine the occurrence of meteotropic situations in Poland in years 2000–2020. The study took into account the characteristic elements such as very hot days (tmax> 30°C), frosty days (tmax< 0°C), day-to-day changes of mean daily air temperature (Δtśr> 6°C), day-to-day changes of mean daily air pressure (≥ 8 hPa) and days with insolation deficit. The research indicated that the highest heat stress strain is typical of the western and central parts of Poland and the highest low air temperature stimuli intensity of high mountain regions. Then, the highest fluctuations of the air temperature interdiurnal variation are characteristic of high mountain regions with the air pressure interdiurnal changes typical of the coastal region. According to our research, the most frequent meteotropic situation was associated with the insolation deficit occurring mostly in the north-eastern and high mountain regions of Poland.
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