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The unusual clouds formed from an aircraft dissipation hole or trail is given the name of Hole Punch. This type of cloud is in round or oval shape. This appears in thin layers. This type of cloud is common in areas where jet flight paths intersect altocumulus or cirrocumulus layers. On 11th December 2003 the usually cloud were formed over the Mobile, Alabama area. The clouds were given the name of Hole Punch. These clouds were also seen in south Florida, the Carolinas and even Australia and Canada. It means that it is not uncommon but happens on an infrequent basis.
Ice crystals, jet stream winds combine for rare display By David Larimer FLORIDA TODAY weather columnist A unusual cloud formation appeared in skies over the Space Coast on Thursday caused by ice crystals and enhanced by the jet stream. There is no scientific term for the cloud display you see above. The National Weather Service calls the formation "hole-punch" clouds because of the oval-shaped opening. The image was captured by meteorologists Matt Bragaw and Peter Blottman at the weather service office in Melbourne on Thursday morning. The display is rare but has occurred in Melbourne skies in years past. In 1993, the weather service's Dennis Decker photographed a similar display. His dramatic photo was published in a national weather magazine. Randy Lascody, a senior meteorologist at the weather service office, explained the conditions that led to the striking formation: "The atmosphere on Thursday was very dry from about 5000 to 28,000 feet. There was a rather extensive deck of cirrocumulus (mixture of 'super cooled' water droplets and ice crystals) invading the sky associated with strong westerly jet stream winds. "However, the 'hole-punch' features were aligned north/south. This suggests that there was some sort of 'wave' in the atmosphere that was causing rising/sinking air couplets. "This would cause ice crystals in the descending portion of the wave to fall into the super cooled (liquid) cloud layer. When this occurs, the ice crystals grow (at the expense of the liquid droplets). Therefore, a hole opened in the deck of cirrocumulus. "This process is similar to the principle used in cloud seeding to make cloud particles larger and produce precipitation. In this case, the precipitation aloft (meteorological term is 'virga') descended into the dry air below 28,000 feet and evaporated (actually, the proper term for this process is 'sublimated'). "The virga is evident in a few of the pictures descending from the center of the hole in the clouds. This resulted in a cone-shaped cloud high in the atmosphere that I'm sure a few people thought was a funnel cloud."
Originally posted by OzWeatherman
reply to post by redwoodjedi
Yep no worries
I think this should be moved to the fragile earth froum though....esepcially if we are able to make it into a sticky
Originally posted by OzWeatherman
The first three pictures you showed are a perfect example of virga pushing through a layer of altocumlus, you can actually see the cirrus in the middle of the hole
There was also a good picture of a jet creating a line through an altocumulus layer, I will try to find it.
Also, the description given by the meteorologist is pretty much dead on. I dont think I could expand on that at all.
Maybe we should call for observations of this phenomen to be posted here as a sticky. I can post the weather balloon data and we could compare the observations to this information. Just an idea
Originally posted by jacksmoke
reply to post by redwoodjedi
edit to add: how /why in the first pic of the OP that there are two holes of seemingly identical proportion so close together with no virga decending from it? or
[edit on 15-10-2009 by jacksmoke]
Originally posted by lightning rodney
Originally posted by jacksmoke
reply to post by redwoodjedi
edit to add: how /why in the first pic of the OP that there are two holes of seemingly identical proportion so close together with no virga decending from it? or
[edit on 15-10-2009 by jacksmoke]
What we can see in these great photographs does not really match the theory, so the theory needs to be explained for each example. Cause and effect need to be worked out for each one, or at least as much as can be worked out from the visual evidence.
similar cloud to the moscow hole punch cloud
(can someone let me know how to post images on the forum, thanks!)
[edit on 16-10-2009 by lightning rodney]
Hole Punch Cloud – Not UFO – Spotted over Moscow
Posted by Jay Michaels on 10/12/09 •
A rare cloud formation was spotted over Moscow this week, inciting widespread discussion of UFO sightings throughout the city – concerns which spread across the globe instantly via the internet. The British tabloid The Sun reported as a “Mystery UFO Halo” over Moscow although it was likely simply an interesting phenomenon created by planes flying through layers of thin high-altitude clouds. A "hole punch cloud" as seen over Moscow last week. Such clouds are rare and awe-inspiring as their cause is still somewhat mysterious. A "hole punch cloud" as seen over Moscow last week. Such clouds are rare and awe-inspiring as their cause is still somewhat mysterious. Hole punch clouds are often attention-grabbers, as they are relatively rare. When they do form, they tend to persist and are large enough to be seen for miles around. The foundation of a hole punch cloud is traditionally a mid- or high-altitude cloud type such as cirrus or cirro-stratus. Such clouds generally form above 20,000 feet or so in the atmosphere. The National Weather Service has explained that such clouds are frequently composed of both ice crystals and super-cooled water droplets – water that is below the freezing temperature but still exists in liquid form. When such a delicate balance occurs, only a slight disruption of this delicate balance may lead to a striking result. This hole punch cloud is a particularly vibrant example of both the foundational cloud form and the evaporation of the water droplets in the surrounding environment. Some hold punch clouds are even referred to as "crop circles in the sky." This hole punch cloud is a particularly vibrant example of both the foundational cloud form and the evaporation of the water droplets in the surrounding environment. Some hold punch clouds are even referred to as "crop circles in the sky." A hole punch cloud photographed over Alabama in 2003. Photo Source: Gary Beeler, Warning Coordination Meteorologist, National Weather Service Mobile, Alabama. A hole punch cloud photographed over Alabama in 2003. Photo Source: Gary Beeler, Warning Coordination Meteorologist, National Weather Service Mobile, Alabama. Frequently, the ice crystals may slowly grow and expand at the expense of the liquid droplets. But when the balance is disrupted, the droplets may freeze instantly and thus permit the liquid droplets in the environment to evaporate, resulting in a “hole” in the cloud. Another hole punch cloud, this one photographed over Colorado in 2007. Photo source: Colorado Uerlings:
www.neatorama.com...
Another hole punch cloud, this one photographed over Colorado in 2007. Photo source: Colorado Uerlings:
www.neatorama.com...
It is believed that a cloud may be disrupted in this manner when a a jet flies through the thin cloud layer. Such a disruption may spur the quick freezing of liquid droplets and evaporation of other droplets. This would create the void in the space in which the jet passed through the layer. While the source of hole punch clouds may be somewhat uncertain, they are certain to cause quite a vigorous discussion.