Welcome to TalkWeather! That event is very interesting as no violent tornado has occurred that far north before/since. I do wonder what damage resulted in an F4 rating for that tornado as the damage photos don’t show anything that violent.First time poster here, i haven't seen much info on the 1934 Kiuruvesi F4 in Finland so i'm gonna post what i know here for anyone who might want to know. Eyewitnesses say it started over the lake with "quickly forming funnel-like vorticies" it then moved NW along the coast of Kiuruvesi where it ripped off roofs "throwing one 3 km", "flattened" a park, threw cars and destroyed old trees, it had a width of 100-200 meters and lasted for about 10 minutes.
Here are the pictures i found of the damage.
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The path it took.
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Simple recreation of that path in google earth.
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I also found this picture of tree damage caused by the Pulkkila F3 that happened on the same day.
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Thing of note is that this is the northernmost F4 rated tornado in the world.
All this info was gathered from archived newspapers.