How are "Skypunch" formed?

 
What is this phenomenon called "skypunch"? 

 
A few days ago, a "hole drilling" was seen in the skies of L.A. California. The incredible natural phenomenon attracted the attention of the locals, who shared photographs of the "Skypunch" through their social networks.

But how is this phenomenon formed? 

 
Quite simply, this phenomenon is the result of a combination of low temperatures, air traffic and atmospheric stability that is somewhat unusual, according to the NASA Earth Observatory.  When crystals form from superheated water, the crystals and the small water droplets that surround them suddenly evaporate, leaving a hole in the cloud.

 

CURIOUS, NO?