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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Arcus cloud - 20.7.2018 at 18.00 - 20.7.2018 at 18.30 Turenki Observation number 75485

Visibility IV / V


A avalanche cloud accompanied by a rumble at the end of the cloud front. No ground lightning was observed at all. Lots of rumble but only a couple of visible clouds.



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