Cloud Type Purpose: to use cloud type to help predict the weather. Background: There are three things that are needed for a cloud to form: water in the atmosphere, a change in temperature (which can be caused by a change in pressure), and condensation nuclei (particles of dust, pollen, etc. in the atmosphere that the water attaches to). There are three basic

ickybiblegroveInternet and Web Development

Nov 3, 2013 (3 years and 9 months ago)

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Cloud Type


Purpose:

to use cloud type to help predict the weather.


Background:

There are three things that are needed for a cloud to form:
water in the atmosphere, a change in temperature (which can be caused by
a change in pressure), and condensation nu
clei (particles of dust, pollen,
etc. in the atmosphere that the water attaches to).
There are three

basic
types of clouds.

Cirrus clouds are high clouds made of ice crystals that
look wispy. Stratus clouds are flat clouds that look layered. Cumulus
clouds

are heaped and puffy and look like cotton balls.


Materials:

cloud chart or access to internet


Purpose:


A.


Using the cloud chart, identify all types of clouds in the sky. If a


cloud chart is not available, there are some good color pictures at:




http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/home.rxml




http://www.eo.ucar.edu/webweath
er/cloud3.html



http://vortex.plymouth.edu/cloud.html/


B.
Record the types of clouds in your data table.


C.
Sequences of clouds can sometimes be used to predict weather.


However, this i
s assuming that winds and other factors do not
change.


D. To predict the weather, you need to see the clouds over a period of


time. In general,

if a warm front is coming into your area, you will


usually see cirrus, cirrostratus, altostratus, n
imbostratus and then



stratocumulus clouds. Precipitation will usually occur within 20


hours of seeing the cirrus clouds and usually occurs toward the end


of the frontal area. If a cold front is coming in, you will usually see


cirroc
umulus, altocumulus, cumulus, cumulonimbus, cumulus, and


then stratocumulus with cirrus higher up. The rain usually occurs


before the temperature change with this type of front. Precipitation


usually occurs within a few hours of the cirro
cumulus clouds.