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Number of days with thunderstorm in the area of Bydgoszcz in the years 1971-2010 using the example of the Bydgoszcz-Airport weather station

Łaszyca Edward Zbigniew

Geography and Tourism

2021

Vol. 9, No. 2

67--74

The paper analyses the occurrence of thunderstorms in Bydgoszcz in the multi-annual period 1971–2010 based on data from the Bydgoszcz-Airport weather station – ref. EPBY according to ICAO (International Civil Aviation Organization). The article examines variations in monthly, seasonal and annual mean values of weather elements. The calculation pertaining to selected elements of descriptive statistics involved regression analysis. Based on the linear function the author determines the direction and trends of changes of the analysed elements in time. Analysis of this data leads to the conclusion that the number of thunderstorms in the examined forty-year period declined, but also a decrease in the frequency of this phenomenon was observed in Bydgoszcz. The highest number of storms in the examined multi-year period in the whole year (29) and in the warm half-year (28) was recorded in 1973 and in 1997, and the lowest in 2003 (only 6). The studies indicate a significant downward trend in the number of storms occurring in the multi-annual period 1971-2010.

Anemometric conditions in the area of Bydgoszcz in the years 1971–2010 using the example of the Bydgoszcz-Airport weather station

Łaszyca Edward Zbigniew

Geography and Tourism

2020

Vol. 8, No. 2

107--119

This paper refers to the characteristics of anemometric conditions in the area of Bydgoszcz based on data sourced from the Bydgoszcz-Airport weather station in 1971–2010. Annual mean wind speed measured in a multi-annual period was higher in the winter half-year and lower in the summer half-year, which is typical of the climate of central Poland. In the analysed multi-annual period, the annual mean wind speed was 3.3 m·s-1. The annual curve of average wind directions in the multi-annual period was characterised by a prevailing share of west wind, followed by that of south, east and north winds. The prevailing average wind direction in the analysed multi-annual period was west wind (W), followed by southwest (SW), northwest (NW), southeast (SE), east (E), south (S), north (N) and northeast (NE) wind.