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 of 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 on) • 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 oceans (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 of 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 on • Cloud Tutorial PowerPt ( about 10 min: needs sound) if time permits • Weather Eye Simulation (optional)