Cloud ud Forma matio tion Cloud droplets are made of LIQU QUID - - PowerPoint PPT Presentation

Cloud ud Forma matio tion

• Cloud droplets are made of LIQU

QUID ID water droplets and / or ice crystals

• in order for clouds to form you need

– 1. moisture (water vapor) – 2. cooling (to dew point) – 3. particles ~ condensation nuclei (smoke, dust, etc)

Cloud types (classified by height and appearance) E-activity: Types of Clouds Face in the cloud uds (websi

bsite) e)

3 m main in types es of clouds uds

class ssified d accordi cording ng to shape pe and height

• Cumulus

lus – puffy with flat bottom – form when warm air rises – can result in showers – may develop into cumulonimbus clouds (CB)= T-storm

• Cirrus

rus – thin, wispy, feathery, white clouds – form at top of troposphere (so… they are icy)

3 m main in types es of clouds uds

• Stratus

atus – form in smooth, flat layers – blanket a large area of the sky (usually gray) – called nimbostratus if precipitating (long periods

• f drizzle or snow)

– called fog if formed at/near the ground

• Other

r Cloud uds – Nimbo ~ means producing precipitation – Alto ~ means middle altitudes – Contrails ~ made by airplanes’ exhaust

Websites ites

• a. Types of clouds (with pictures)
• b. Cloud pictures:
• c. More cloud pictures (as time permits):
• d. Cloud matching game --if time permits:

Precipit cipitat ation ion

• 5 types of precipitation

– Rain/drizzle – Snow – Sleet (also called ice pellets) – Hail – Freezing rain/freezing drizzle

RAIN

• Water droplets fall

from the sky (clouds)

• Droplets vary in size,

speed depends on the wind

• Washes dirt and other

particles out of the air

SNOW

• water vapor

changes directly to a solid (Deposition

• n)
• SNOW was

NEVER rain

HAIL

• balls of ice that fall from

thunderstorms

• each trip up and down is

a layer

• hail forming (animated website)

• Sleet/ice

e pellets ts forms when rain falls through a thick layer of freezing air

• Freezing

ng rain rain freezes right when it hits a layer of ice VERY dangerou rous

Measuring Precipitation

• rain gauge
• ruler for snow

Did you know…

• About 78% of all precipitation falls over Earth’s
• ceans (WHY?). Of the 22% that falls on land,

about 65% returns to the air by evaporation.

• The largest hailstone ever recorded fell in

Bangladesh in 1986. It weighed over 1 kg.

• *Arica, Chile has an average rainfall of less than 1

mm a year (.76 mm)

• Kauai, Hawaii has average rainfall of 12 meters a

year (keep in mind that (Atl tlan anta ta gets ts an average age of 1.3 meter ters s per year) r).

Funny??

• What is a king’s favorite kind
• f precipitation?

...............HAIL

• What do you get when you

cross a snowman with a vampire? ...........Frostb tbite te

• What do you call it when it

rains chickens and ducks? ....... Foul weather

Websites

• Weather

r Maker simula lati tion

• n
• Cloud Tutorial PowerPt (about 10 min: needs sound)

if time permits

• Weather Eye Simulation (optional)