a “virga hole” observed this Tuesday, what is this strange phenomenon?

Understanding the virga hole weather phenomenon

And I changed my mind was observed this Tuesday, January 14 in Occitania. The phenomenon was photographed in Audefrom the municipality of Montredon-des-Corbières. The virga hole, also called “fallstreak hole” in English, is a rare and spectacular meteorological phenomenon that intrigues enthusiasts of weather report than casual observers of the sky. This phenomenon results in a circular or oval hole appearing in a cloud, generally within an altostratus or cirrocumulus cloud bank. Here is a detailed explanation to better understand this curious spectacle.

This phenomenon results from a specific physical process. Clouds containing supercooled water droplets play a central role. These droplets remain liquid even at subzero temperatures because they lack the particles needed to turn into ice crystals.

When a disruptive element, such as a plane flying through the cloud, causes a rapid drop in temperature or change in pressure, the droplets suddenly freeze. This process causes ice crystals to form, which become heavier and fall to the ground as precipitation, often before evaporating as they reach drier layers of the atmosphere. This evaporation creates the famous “virga hole”.

Why is the virga hole so impressive?

The phenomenon fascinates with its unique and astonishing appearance. Seen from the ground, it looks like a perfect gap in the sky, sometimes surrounded by dramatic cloud shapes. When it occurs at sunrise or sunset, the light rays further amplify its visual effect, creating a spectacle worthy of a natural work of art.

Where and when can a virga hole be observed?

This phenomenon can occur anywhere in the world, but is more common in regions where high-altitude clouds predominate. Ideal conditions include cold temperatures aloft and low humidity below the cloud. Although unpredictable, it is often associated with the presence of significant air traffic, as aircraft can act as triggers.

The virga gap and confusions with other phenomena

It is important not to confuse the virga hole with other phenomena such as solar halos or lenticular clouds. Unlike the latter, the virga hole results from a dynamic process linked to the transformation of water into ice, which gives it a well-defined scientific origin.

A harmless but fascinating phenomenon

Although its appearance may intrigue or even worry, the virga hole has no direct impact on local climate or weather conditions. However, it represents a great opportunity for the curious to discover the complexity of interactions in the atmosphere. The virga hole, in addition to its unique aesthetics, reminds us that nature still conceals many mysteries to explore. Watch the sky, because the next apparition might be right above you!