Wall Cloud Vs. Shelf Cloud
Some storms contain shelf clouds, which are often mistaken for wall clouds, since an approaching shelf cloud appears to form a wall made of cloud. Generally, a shelf cloud appears on the leading edge of a storm, and a wall cloud is usually at the rear of the storm, though small, rotating wall clouds (a feature of a mesovortex) can occur within the leading edge on rare occasion. Wall clouds are inflow clouds and tend to slope inward, or toward the precipitation area of a storm. Shelf clouds, on the other hand, are outflow clouds that jut outward from the storm, often as gust fronts.
Read more about this topic: Wall Cloud, Structure
Famous quotes containing the words wall, cloud and/or shelf:
“It is bad to be poor. I shall go to the wall for bread and meat, if I neglect my business this year as well as last.”
—Abraham Lincoln (1809–1865)
“I belong to the fag-end of Victorian liberalism, and can look back to an age whose challenges were moderate in their tone, and the cloud on whose horizon was no bigger than a man’s hand.”
—E.M. (Edward Morgan)
“Books are like imprisoned souls till someone takes them down from a shelf and frees them.”
—Samuel Butler (1835–1902)