WW2010
University of Illinois

WW2010
 
  welcome
 
> online guides
 
  archives
 
  educational cd-rom
 
  current weather
 
  about ww2010
 
  index

Online Guides
 
  introduction
 
> meteorology
 
  remote sensing
 
  reading maps
 
  projects, activities

Meteorology
 
  introduction
 
  air masses, fronts
 
> clouds, precipitation
 
  el nino
 
  forces, winds
 
  hurricanes
 
  hydrologic cycle
 
  light, optics
 
  midlatitude cyclones
 
  severe storms
 
  weather forecasting

Clouds, Precipitation
 
  introduction
 
  mechanisms
 
  precip processes
 
  high level clouds
 
> mid level clouds
 
  low level clouds
 
  vertically developed
 
  other cloud types

Mid Level Clouds
 
> altocumulus

User Interface
 
  graphics
> text

NOTE: We've guessed that you're not using a client that supports colored tables and have tried to compensate. Low graphics mode looks much better on clients that do... we recommend switching to Netscape 3.0 or Microsoft Internet Explorer.
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Altocumulus Clouds
puffy masses or parallel bands

Mid-level clouds have cloud bases typically between 6500 to 23000 feet (2000 to 6000 meters). Because of their lower altitudes, they are composed primarily of water droplets. However, when the temperatures are cold enough, they can be composed of ice crystals as well.

[Image: puffy altocumulus clouds (87K)] Altocumulus clouds generally appear as puffy masses and are located roughly 3-4 km above the ground. One part of the cloud darker than the rest, a characteristic which makes them distinguishable from the higher cirrocumulus. Altocumulus typically form from gradual lifting of air ahead of an advancing cold front.

[Image: wavelike altocumulus clouds (91K)] In other instances, altocumulus clouds are aligned in parallel waves or bands. In the presence of rising air at cloud level, altocumulus take on the appearance of little castles and these clouds are often seen on warm, humid summer mornings, occasionally followed by thunderstorms later in the afternoon.


Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.