From AMS Glossary
Revision as of 15:50, 20 February 2012 by Perlwikibot
A cumulus cloud that has much greater vertical than horizontal extent.
It frequently takes the form of a long "neck" protruding from the tops of a lower cloud mass where a locally strong convection current has penetrated the inversion. The shape results from the penetration into relatively moist air aloft which inhibits evaporation.