SCOOL Banner
FOR TEACHERS  »    • Teacher Resources     • S'COOL Materials     • News and Reviews     • FAQ     • Online Tutorials     • Glossary    

S'COOL: New Findings about Clouds

A New Phenomenon Hole-Punch Clouds

This photo on the Astronomy Picture of the Day (APOD) website shows what is being called a "hole-punch" cloud on January 12, 2004 over Mobile, AL, USA. Recently, I (S'COOL director Lin Chambers) met a Middle School teacher from Mobile whose students spotted and photographed this cloud. If you follow the links on the APOD site you will see a few other reports of these kinds of clouds.

These clouds have also been spotted recently in some satellite imagery, as reported by colleagues at the University of Wisconsin-Madison (Scott Bachmeier in particular). A November 2003 event appears to be the result of an aircraft dissipation trail (distrail) - where water vapor in the exhaust of a plane initiates the formation of ice crystals which then absorb the water droplets in the atmosphere and create the hole.

A January 2004 event in the Chicago area is much less clear in origin.

go to NASA.gov
+ Visit NASA.gov

+ NASA Privacy, Security, Notices
+ USA.gov
+ Comments or Questions?

Page Curator: Jay Madigan
NASA Official : Lin Chambers
Contact S'COOL
Last updated: