image stats
rating
3.67
votes
40
views
1398
uploader
Lexx
comments
1
date added
2008-12-22
category
Sport
previous votes
Loading..
log in
Username:

Password


indent register
indent recover

hole in the clouds

1 star2 stars3 stars4 stars5 stars
hole in the clouds

Comments for: hole in the clouds
Lexx Report This Comment
Date: December 22, 2008 08:18PM

What could create a huge hole in the clouds? Such a hole, likely hundreds of meters across, was photographed last month from a driveway near Mobile, Alabama, USA. Very unusual to see, hole-punch clouds like this are still the topic of meteorological speculation. A leading hypothesis holds that the hole-punch cloud is caused by falling ice-crystals.

The ice-crystals could originate in a higher cloud or be facilitated by a passing airplane exhaust. If the air has just the right temperature and moisture content, the falling crystals will absorb water from the air and grow.

For this to happen, the water must be so cold that all it needs is a surface to freeze on. The moisture lost from the air increases the evaporation rate from the cloud water droplets so they dissipate to form the hole. The now heavier ice crystals continue to fall and form the more tenuous wispy cloud-like virga seen inside and just below the hole. Water and ice from the virga evaporates before they reach the ground.