Soms zou je eraan twijfelen, maar in dit geval moet je ook over de grenzen kijken. 
Trends in storm environments over the last 4 decades suggest increases over Europe and decreases over the United States
A recently released research article published in the Bulletin of the American Meteorological Society indicates that stronger convective inhibition causes declines in the frequency of thunderstorms over the United States, while a substantial increase in low-level moisture supports more thunderstorm activity over southern, central, and northern Europe.
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