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Clouds
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Cloud Classification
1. Based on Altitude

• Appearance
• from the ground

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High Level Clouds

• Base of the Cloud is above 6000 m (over 20,000
  feet)
• - very cold

- Thin and white in appearance
- Composed of ice crystals
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Cirrus

• WEATHER
• Usually associated with fair weather
• Sometimes in advance of a storm system

- Wispy or feathery in appearance
- Called Mares Tails
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- White-veined clouds that produce halos around
sun or moon (due to light waves being bent by ice
crystals)
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Cirrocumulus

• Least common of high clouds

- Appear like rippled sand or waves or fish scales
http//aposf02.cityu.edu.hk/ksliu/obs/cloud/Cirro
cumulus1.jpg
- Mackeral Sky

• WEATHER
• Omen of good weather

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Mid Level Clouds

• Bases appear between 2,000 6,000 m.
• (10,000
  20,000 feet)

- Composed mainly of water droplets
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Alto-Cumulus
- White to gray / larger than cirrocumulus

• Puffy / often rippled or appear in waves

- Sheep-back clouds
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Alto-stratus
- Formless gray or bluish in color

• Forms a thin veil over Sun or moon

http//www.mmem.spschools.org/grade5science/weathe
r/altostratus.jpeg
WEATHER - light precipitation is coming
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Low Level Clouds
- Base below 2,000 m (under 10,000 feet)
- Composed usually of water droplets unless the
temperatures are very cold
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Cumulus
- Dense, billowy clouds
- Flat bases
- Can be isolated or closely packed
WEATHER - Fair weather / lasts for a relatively
short period of time then disappear
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Strato-Cumulus
- Soft, gray clouds
- Rolling mass of thin lumpy clouds / often
joined together
WEATHER - Some precipitation with breaks of
clear sky in between - Not long lasting
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Stratus
- Uniform cloud resembling fog

• WEATHER
• rain or drizzle
• Lift quickly and indicate a fine day ahead

- low layer that covers entire sky
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Nimbo-stratus
- Dark gray sheets that blot out the sum

• WEATHER
• Indicative of lengthy precipitation
• Light to moderate precipitation in the form of
  rain or snow depending on the temperature

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Other Clouds
Contrails High level / extremely cold
temperatures formed from Jet engines
Billows unstable air flows
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Mammatus Clouds examples of sinking air -
harmless, but often seen after thunderstorms have
passed.
Pileus smooth clouds capping over mountain tops
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Vertically Developed Clouds
- Arise usually from swelling Cumulus
- Grow to heights of over 39,000 feet by thermal
convection of frontal lifting
- Incredible amounts of energy
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Cumulo-nimbus

• Towering Cloud

- Often with anvil head

• WEATHER
• Fast building / Squall line
• - Heavy rainfall, thunder, lightning, hail
  tornadoes

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TEST
Number your paper 1 to 20
Remember the cloud classification
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(No Transcript)
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"ID-ing" the Clouds
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CHOICES Cirrus, cirrostratus, cirrocumulus,
alto cumulus, altostratus, stratocumulus,
stratus, cumulus, nimbostratus, cumulonimbus
Stratocumulus
Cirrus
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CHOICES Cirrus, cirrostratus, cirrocumulus,
alto cumulus, altostratus, stratocumulus,
stratus, cumulus, nimbostratus, cumulonimbus
Cumulus
Cumulo-nimbus
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CHOICES Cirrus, cirrostratus, cirrocumulus,
alto cumulus, altostratus, stratocumulus,
stratus, cumulus, nimbostratus, cumulonimbus
Cirrostratus
Altostratus
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CHOICES Cirrus, cirrostratus, cirrocumulus,
alto cumulus, altostratus, stratocumulus,
stratus, cumulus, nimbostratus, cumulonimbus
Cirrocumulus
Altocumulus
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CHOICES Cirrus, cirrostratus, cirrocumulus,
alto cumulus, altostratus, stratocumulus,
stratus, cumulus, nimbostratus, cumulonimbus
Stratus
www.weatherpictures.nl/ stratus.html
Nimbostratus
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Sources
http//www.ucar.edu/educ_outreach/webweather/cirru
s.html
http//www.wxdude.com/page9.html
http//www.ems.psu.edu/lno/Meteo437/atlas.html
Cloud Pictures
www.geografforbundet.dk/ vejret/kikop.htm
web.ukonline.co.uk/.../ Cloud20formations.htm
meteonew.free.fr/ nuages/altocumulus.htm
www.mmem.spschools.org/. ../altostratus.html