Abstract. The main subject of the research whose outcomes are presented in this paper is the spatial and temporal variability of thermal conditions in Poland during the period from 1951 to 2015. The analysis revealed the occurrence of symptoms indicating a systematic and sustained warming. Significant growth is observed in mean and extreme temperatures and their extreme percentiles, as well as in annual number of hot days, warm waves and their duration. In turn, downward trends are noted in series of the annual number of frost days, as well as in the number of cold waves and their duration. The results obtained confirm the thermal pattern determined for the whole region, especially for the southern part of the Baltic Sea basin. Poland, 1951Poland, -2015 Contemporary changes of thermal conditions in

The primary objective of the paper was the determination of the atmospheric circulation favouring the occurrence of strong and very strong stress of the human organism due to heat stress in Poland. The paper was prepared based on data obtained from the Institute of Meteorology and Water Management-National Research Institute and the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR). The criterion of extreme stress of the human organism adopted in the paper covered conditions in which the Universal Thermal Climate Index (UTCI) value was higher than 32°C. The research showed a statistically significant increase in half of the analysed stations and an increasing tendency or no changes in the remaining stations. Moreover, after 1990, conditions particularly strenuous for the organism were recorded (UTCI > 40°C) over a major part of the territory of Poland. The occurrence of days with strong and very strong heat stress in Poland was related to the presence of high-pressure systems blocking zonal circulation. The research permitted the designation of three types in which the pressure field showed common features, but differed in the location of anticyclonic systems.

No abstract

The aim of this study is to investigate the patterns and trends of drought occurrence in the northern part of Poland on the example of the Łeba river basin in the years 1956–2015. The study of meteorological drought was conducted on the basis of the Standardized Precipitation Index (SPI) on the scale of 1, 3, 6, 9, and 12 months. Annual precipitation totals did not show significant changes in the analyzed period, except for the station in Wejherowo, which is characterized by a significant increasing trend. The analysis of the long term of the variability average annual air temperature showed its statistically significant increase in the analyzed area at the rate of about 0.2 °C per decade. During the analyzed period, 14 to 84 meteorological droughts were identified, with durations ranging from 200 to 300 months. As the period of accumulating values of SPI, the number of droughts decreased, while their total duration increased. Most droughts were mild in nature, while extreme droughts accounted for between 5.2% and 10.7% of the duration. Drought intensification was shown only for SPI-1 in February and March in Wierzchucino station. On the other hand, a decreasing trend in SPI values was noted during longer periods of accumulation (SPI-6, 9, and 12).

Zarys treści. Celem artykułu jest przedstawienie potencjału rekreacyjnego Sudetów poprzez prezentację użyteczności warunków pogodowych dla turystyki i rekreacji. Na podstawie diagramu informacji klimatyczno-turystycznej (CTIS), określone zostały cechy charakterystyczne bioklimatu Sudetów -częstość występowania zarówno określonych warunków biotermicznych, jak i sytuacji pogodowych, w świetle poszczególnych elementów meteorologicznych. Wyniki badań pokazały, że w świetle uwzględnionych kryteriów niższe piętra hipsometryczne cechuje większa użyteczność warunków bioklimatycznych dla turystyki i rekreacji, co wynika z mniej uciążliwych warunków termiczno-wilgotnościowych, wietrznych i opadowych w porów-naniu do strefy szczytowej. Wyjątek stanowi rekreacja narciarska, do której korzystniejsze w porównaniu do niższych pięter warunki występują w najwyższych partiach gór.Słowa kluczowe: bioklimat, Sudety, CTIS, turystyka. WprowadzenieJedną z ważnych cech regionu Sudetów jest intensywne użytkowanie turystyczne. Sprzyjają temu liczne walory przyrodnicze, kulturowe oraz dobrze rozwinięta baza turystyczna. Na rozwój turystyki wpływa również duża liczba uzdrowisk, a także bardzo dobre warunki do uprawiania różnych form turystyki i rekreacji, zwłaszcza narciarstwa. Jednocześnie Sudety, w porównaniu do nizinnej części Dolnego Śląska, charakteryzuje znaczna odmienność warunków