Highest ever northern latitude where thunderstorm was occurred?

[Tarmo Tanilsoo]

Good afternoon.

This time I am posting a weather question. I was browsing wetterzentrale.de's lightning map today and I see that there has been a thunderstorm as far north as at Northern Norway(North from Finnish northern border!). I started to wonder, what is the highest northern latitude, what has ever had a thunderstorm?

 

[Rocky Rascovich]

I remember a couple of summers back..(I think '04 or '05) that Barrow, Alaska reported a thunderstorm. It apparently freaked out the local residents who had'nt experienced that phenomenon in over 25 years.

Areas near Iceland occasionally report thunderstorms where the gulf stream interacts with the colder currents.