Wed. Jan 27th, 2021

Rare 'hole in the sky' pictured over British town

1 min read

A rare hole in the sky has been pictured over a British town.

Known as a fallstreak hole or cavum hole, it was snapped over Shepton Mallet in Somerset this week.

It is a large gap usually circular or elliptical that can appear in cirrocumulus or altocumulus clouds.

These so-called holes are formed when water temperature in the clouds is below freezing but the water, in a supercooled state, has not frozen yet due to the lack of ice nucleation.

When ice crystals do form, a domino effect is set off due to the Bergeron process (the process by which precipitation is initiated in a mixed cloud with temperature below freezing), causing the water droplets around the crystals to evaporate leaving a large, often circular, hole in the cloud.

The result, as you can see from these pictures, is quite photogenic.

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