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Mini Unit Weather III. High Level Clouds. Cirrus Clouds Occur during fair weather Point the direction of air movement at the elevation the cloud is located at (usually at 20,000 feet). Cirrostratus Clouds Thicken as a warm front moves in Composed of ice crystals and generally transparent

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Mini Unit Weather III

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Mini unit weather iii

Mini Unit

Weather III


Mini unit weather iii

High Level Clouds

  • Cirrus Clouds

  • Occur during fair weather

  • Point the direction of air movement at the elevation the cloud is located at (usually at 20,000 feet)

  • Cirrostratus Clouds

  • Thicken as a warm front moves in

  • Composed of ice crystals and generally transparent

    • -Reflections off the ice crystals forming a “halo” around the sun

Image taken from: http://mayang.com/textures/Nature/html/Clouds/index.html

Image taken from: http://www.flashcardmachine.com/cloud-names-andpictures.html

Image taken from: http://media.photobucket.com/image/cirrostratus%20clouds/watertiger/450WEATHER_SUN_DOG_WHSE101_55819002.jpg

Image taken from: http://www.freewebs.com/thomp730/weather.htm


Mini unit weather iii

Mid-Level Clouds

  • Altocumulus Clouds

  • May look like parallel bands or rounded masses

  • Usually form by convection

  • Usually indicate a thunder storm later on in the day on a warm and humid summer morning

  • Altostratus Clouds

  • Usually cover the whole sky

  • Blue-gray appearance

  • Sun and moon appear fuzzy through these clouds

  • Form ahead of storms with continuous rain or snow

Image taken from: http://www.answers.com/topic/altostratus-cloud-1

Image taken from: http://www.uen.org/weather/clouds/altoc2.shtml

Image taken from: http://www.panoramio.com/photo/5302238

Image taken from: http://library.thinkquest.org/26804/systems/clouds.html


Mini unit weather iii

Low-Level Clouds

  • Nimbostratus Clouds

  • dark in appearance

  • Bring light precipitation

  • Mostly made up of water droplets

  • Bases lie below 6,500 feet

  • Stratocumulus

  • Dark gray or light gray in appearance

  • Rounded masses

  • Sometimes bring very light precipitation

Image taken from: http://207.45.186.82/%7Emdelfs/iphone/clouds/index.html

Image taken from: http://facstaff.bloomu.edu/jcollins/Boutique.htm

Image taken from: http://www.windows.ucar.edu/tour/link=/earth/Atmosphere/clouds/cloud_il.html&edu=high

Image taken from: http://pro.corbis.com/search/Enlargement.aspx?CID=isg&mediauid=F2896174-9345-477A-BF7C-11E86EE73F8B


Mini unit weather iii

Vertically Developing Clouds

  • Fair Weather Cumulus Clouds

  • Look like floating cotton

  • Have flat bases and distinct outlines

  • Only show slight vertical growth

  • Only last 5-40 minutes

  • Pushed by thermals (air bubbles)

  • Can develop into cumulonimbus clouds and produce large thunderstorms

  • Cumulonimbus Clouds

  • Larger and more vertically developed than fair weather cumulus

  • Pushed by convective updrafts

  • Tops can reach 39,000 feet or higher

  • Can be associated with supercells

Image taken from: http://www.totalgamerzone.com/forums/showthread.php?t=7872

Image taken from: http://www.centennialofflight.gov/2003FF/clues/index.html

Image taken from: http://lifeabovetheclouds.blogspot.com/2008_08_01_archive.html

Image taken from: http://earthsci.org/processes/weather/clouds/cloud.htm


Mini unit weather iii

Other Types of Clouds

  • Contrail Clouds

  • Also known as condensation trail

  • Resembles the trail of a kite

  • Produced at high altitudes when water droplets freeze before they can evaporate

  • Billow Clouds

  • Formed from instability of air flows with vertical shear

  • -common name for this is Kelvin-Helmholtz instability

  • Appear as a row of horizontal eddies within the vertical shear

image taken from: http://www.crystalinks.com/chemtrails.html

Image taken from: http://weather.about.com/b/2008/05/19/what-is-a-kelvin-helmholtz-cloud.htm

Image taken from: http://apollo.lsc.vsc.edu/classes/met130/notes/chapter5/contrails.html

Image taken from: http://commons.wikimedia.org/wiki/File:Mammatus-clouds-Tulsa-1973.png

Image taken from: http://www.mrs.org/s_mrs/doc.asp?CID=7146&DID=180059

  • Mammatus Clouds

  • Appear pouch like

  • Formed in sinking air

  • Do not mean that a tornado will form, and usually come after a thunderstorm

Image taken from: http://www.dphotojournal.com/mammatus-clouds-by-jorn-olsen/


Mini unit weather iii

  • Orographic Clouds

  • Formed when air is lifted due to the earth’s topography

  • Pileus Clouds

  • Smooth appearance

  • “attaches” to mountain tops or cumulus towers

Other Types of Clouds

Image taken from: http://www.victoriaweather.ca/clouds.php?image=pileus

Image taken from: http://www.flickr.com/photos/mountain_ear/67102448/

Image taken from: http://www.outdoorsmagic.com/news/article/mps/uan/5887

Image taken from: http://www.wildlandschool.net/curric/quiz/clouds/k.htm


Mini unit weather iii

image taken from: http://www.crh.noaa.gov/arx/images/sprcell.gif

Image taken from: http://www.srh.weather.gov/elp/swww/v8n1/Wxbul8.1.2.htm

WHY is there and ANVIL top??

Which way does the ANVIL face as far as direction of storm?

Which way are storms rotating in the echoes?


Lightening and step leaders

Lightening and Step Leaders


Precipitation

Precipitation


Mini unit weather iii

Work Sited

"Cloud Types:." WW2010 (the weather world 2010 project):. 05 May 2009 <http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/home.rxml>.

"Altostratus Clouds." Windows to the Universe. 05 May 2009 <http://www.windows.ucar.edu/tour/link=/earth/Atmosphere/clouds/

altostratus.html>.


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