A-Topic

Fallstreak Hole

A fallstreak hole appeared over Helsinki in August, 2017. Skypunch is a large gap, elliptical or circular, appear in clouds. It's formed when the water temperature in the clouds is below freezing but the water is not frozen yet.
Skypunch over Helsinki
Fallstreak Hole over Helsinki,
August, 9, 2017

Skypunch over Helsinki from other side.
Punch hole cloud
Cloud canal

Cloud hole over Helsinki, Finland

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a-Topic, 2017