Biology teacher Karstein Erstad was out for a ski in the mountains outside Bergen on Sunday when he came across the unusual phenomenon.
“I saw thousands of earthworms on the surface of the snow,” he told The Local. “When I found them on the snow they seemed to be dead, but when I put them in my hand I found that they were alive.”
At first he thought that they had perhaps crawled though the snow from the ground beneath, but on reflection, he rejected this idea.
“In many places, the snow thickness was between half a meter and a meter and I think they would have problems crawling through the cold snow.”
Since Erstad’s discovery was reported in Norway’s NRK news channel, corroborating reports have flooded in from across southern Norway, with sightings of worm rainfall in Lindås and Suldal near Bergen, and as far away as Femunden on the Swedish border.
“People have now observed the same phenomenon in many places in Norway,” Erstad told The Local. “It’s very peculiar, I don’t know why so many people have discovered it. I don’t know if there have been some special weather conditions lately.”
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Erstad has found reports of the worm rainfall phenomenon taking place in Sweden in the 1920s.
“It’s a very rare phenomenon,” he told The Local. “It’s difficult to say how many times it happens, but it has only been reported a very few times.”