Docstoc

Clouds

Document Sample
Clouds Powered By Docstoc
					Clouds
                 How do clouds form?




  As air rises and cools, it becomes more dense and can hold less
                              water vapor.
   The water vapor molecules condense onto a solid particle and
Warm air is less dense than cold air so it can hold more water vapor.
               form liquid water droplets or ice crystals
      How do clouds form?




              Form Clouds




Thousands of these tiny water droplets or ice crystals
                together in the air…
Liquid water that condenses from the air onto
        a cooler surface is called dew.
Water vapor that condenses onto a surface
   that is below freezing is called frost.
There are 3 main types of clouds classified by shape




                                  Cirrus




         Cumulus                                          Stratus

   Pictures courtesy of Windows to the Universe, http://www.windows.ucar.edu
Cirrus clouds are wispy, feathery clouds that are typically made
   of ice crystals and form at high altitudes. These are often
                    referred to as Mare’s tails.
  Pictures courtesy of Windows to the Universe, http://www.windows.ucar.edu
Cumulus clouds look like fluffy rounded balls of cotton. They
  are low level clouds that typically indicate fair weather.
         Picture courtesy of www.wildwildweather.com
Stratus clouds form in flat layers and ‘blanket’ the sky at low altitudes.
   Light mist or drizzle are typically associated with Stratus clouds.

             Picture courtesy of www.wildwildweather.com
Prefixes or suffixes added to the names of the 3 main
  types of clouds further classify them by weather
                 conditions or altitude.




     Altocumulus Clouds                  Altostratus Clouds



   Clouds that form between 2 and 6 kilometers above earth’s
   surface have the prefix, ‘alto’. These are mid-level clouds.
Prefixes or suffixes added to the names of the 3 main
  types of clouds further classify them by weather
                 conditions or altitude.

   Nimbus used as a prefix or suffix indicates clouds bearing rain.




  Cumulonimbus clouds are towering clouds with a flat top and grey
 bottom, often formed in the shape of an anvil. These are also known
    as thunderheads because they typically bring thunderstorms.
Prefixes or suffixes added to the names of the 3 main
  types of clouds further classify them by weather
                 conditions or altitude.

   Nimbus used as a prefix or suffix indicates clouds bearing rain.




 Nimbostratus clouds are darker grey than regular Stratus clouds and
               are a strong indicator of precipitation.
Stratus clouds that form at or near
   the ground are known as fog.
                             Clouds Summary
Cloud classification      Fair Weather    Drizzly or misty      Stormy

   High Altitude
                            Cirrus
                          (Mare’s tail)


 Medium Altitude
                          Altocumulus      Altostratus


   Low Altitude
                            Cumulus           Stratus        Nimbostratus


Tall (Bottom is low but
  towers to medium /                                         Cumulonimbus
     high altitude)                                          (Thunderhead)


     Stratus clouds that form at or near the ground are known as fog.

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:6
posted:2/9/2012
language:English
pages:14