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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.

Intensity of dangerous phones from waves on selected oceanic routes

Szelangiewicz T., Żelazny K.

New Trends in Production Engineering

2018

Vol. 1, Iss. 1

167--174

Ocean routes are recommended for ships based on economic criteria. Under the influence of waves. during sailing of the ship. various dangerous phenomena arise which can lead to marine crashes. Although weather sites are known to provide short-term weather forecasts (wave and wind parameters). this information is not used to calculate corrections of ocean-route guidelines. A captain based on his knowledge and experience can make such adjustments. The article presents the results of calculations of the values of dangerous parameters of phenomena which may occur during a cruise on example ocean routes. For the calculation of dangerous phenomena. the average statistical long-term (seasonal) parameters contained in weather atlas were used.

Dangerous phones arising from the waves during the oceanic route ship

Szelangiewicz T., Żelazny K.

New Trends in Production Engineering

2018

Vol. 1, Iss. 1

183--189

Ocean routes are recommended for ships based on economic criteria. Under the influence of waves, during the cruise of the ship, dangerous phenomena are created, the intensity of which depends on the speed of the ship and its course in relation to the direction of the waves, the state of the sea, the size of the ship, the state of loading. Although weather services are known, waves parameters are not used to calculate the value of parameters that characterize dangerous phenomena. The article presents the most frequently analysed dangerous phenomena, how they are calculated, the criteria for their evaluation, and the results of calculations for the selected vessel.