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'Hole Punch Clouds' and rare 'Canal Clouds' seen over north Georgia Friday

The clouds looked 'out of this world'. Here's how they form.

Hole Punch Clouds and even more rare Canal Clouds were sighted across metro Atlanta and north Georgia Friday morning.

Formally known as fallstreak holes, hole punch clouds aren't formed by UFOs, Aliens, or anything out of this world. But they do look a bit eerie.

Hole punch clouds form when supercooled water droplets in mid to high level cumulus clouds rapidly freeze. The ice crystals fall, leaving behind a hole.

Credit: John Kelley

RELATED: Meet 11Alive's new and improved StormTracker ThunderTruck

A more rare cloud formation called a 'canal cloud' was also spotted across metro Atlanta Friday. 

The formation is similar to hole punch clouds, but shaped differently. A jet plane flying through this layer of altocumulus clouds triggers the supercooled water droplets to rapidly freeze. 

As the plane flies along, you end up with a narrow and long structure of this gap in the clouds. The photo below shows the long, narrow canal cloud over Atlanta, sent in by 11 Alive StormTracker John Askew.

Credit: John Askew

Here's a further vantage point of both a hole punch cloud and a canal cloud from Atlanta. What a sight to see!

Credit: John Askew

What is even cooler - is that you can see all of these on visible satellite imagery from space! 

Credit: wxia

RELATED: Local Weather Forecast for North Georgia