Background
The author writes that "it is commonly accepted that the frequency of thunderstorms has recently increased rapidly both in Poland and in the whole of Europe," as is generally claimed by climate alarmists for almost all types of severe weather phenomena all around the world, as a consequence - according to them - of CO2-induced global warming.

What was done
In a test of this contention, Bielec-Bakowska analyzed thunderstorm occurrences at seven Polish synoptic weather stations (Hel, Szczecin, Koszalin, Poznan, Wroclaw, Raciborz and Krakow) possessing pertinent data over the period 1885-2000, while "the variability of the phenomenon studied was investigated at 56 synoptic stations in the period 1949-1998."

What was learned
The University of Silesia scientist determined that "over an annual period of 116 years, no clear trends of changes in the number of days with thunderstorms in Poland were found," noting also that "interannual variability of days with thunderstorms in individual seasons did not show any specific trend," except in the winter season, but then only for Szczecin, Krakow and Koszalin, which led her to state that "the analysis did not unequivocally confirm the opinion that the number of thunderstorms in the cold part of the year increases," adding that "a similar phenomenon was observed in the whole of Europe."

What it means
In the words of Bielec-Bakowska, "the opinion of the increase of days with thunderstorms in Poland at the end of the 20th century was not confirmed in this research."