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Danish thunderstorms

Cloud school
2015 | Copenhagen, Denmark

Also:

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Thunderstorm July 2015 in Copenhagen

While Denmark doesn’t strike many as a place with severe weather events, the nation often ends up getting caught in between a dramatic battle between hot and cold.

As the summer peaks from June to August, regional volumes of warm air flow from Central and Eastern Europe, sometimes fuelled by moisture from the Mediterranean. This warm air collides with cooler and wetter air originating from the west (think the North Atlantic) which then triggers long-lasting systems of thunderstorms that can travel for hundreds of kilometres over a day or more.

In the image at the top, a lightning bolt is seen striking from such a large system approaching from Germany. Below is an idealised schematic of the described process.