Cirrus Clouds

Cirrus Clouds

Cirrus clouds over mountain peaks.

Information:
Cirrus clouds usually form at an elevation of 20,000 ft or more. These clouds are composed of ice crystals. They appear during fair weather and look like thin, wispy brush strokes in the sky. They are usually thin because there is little water vapor in that level of the atmosphere. Cirrus clouds are usually blown towards the east by westerly winds. Usually cirrus clouds mean that there is a warm front coming to an area.

Cirrus clouds over the Caribbean.

Sources:

Photos: http://www.edupic.net/Images/Science/cirrus_clouds651.JPG and http://www.gavinhowarthblog.com/wp-content/uploads/2009/08/8135490.jpg

Information: http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/hgh/crs.rxml and http://www.usatoday.com/weather/wcirrus.htm