9th Grade Chapter 3 Lesson 3

9th Grade Chapter 3 Lesson 3

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  9 th Grade Chapter 3 Lesson 3 Pgs. 61-66 For Student Use Only
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  Precipitation and StormsPrecipitation Types: Precipitation- water released from the atmosphere Rain- drops of liquid water falling to earth from the clouds Can form in cold clouds or warm clouds Cold Clouds (Bergeron Process)- frozen nuclei absorb water from the cloud Warm Clouds (collision-coalescence process)- nuclei form large droplets and add more rain Droplets are .5mm and larger
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  Precipitation and StormsPrecipitation Types: Drizzle- Precipitation that consists of droplets smaller than .5mm Sleet (occures in Fall and Winter)- when droplets freeze into solid ice pellets Freezing Rain- raindrops that get supercooled and freeze when they reach something hard Hail- layered balls of ice that form in strong thunderstorms
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  Precipitation and StormsPrecipitation Types: Snow: begins like cold-cloud rain; ice crystals absorb water form into different shapes: Solid Hexagonal plates Thin needles Hollow six sided cylinders or columns Six-pointed star shaped plates Dendrites- (branching, leaf, star-shaped) Individual crystals make snow-flakes
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  Precipitation and StormsStorms: Storms- atmospheric disturbances classified by strong winds, heavy precipitation, or lightning. Most common storms: Thunderstorms Tornadoes Hurricanes
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  Precipitaiton and StormsStorms Thunderstorms: Localized storms involving lightning Squall lines- long lines along a cold front where thunderstorms ocassionally occur. Updraft- a current of rising air (can by triggered by convection currents) Unstable Air- air that is warm and humid near the ground and cold aloft Cumulus stage- condensing moisture in the updraft forms a billowing rapidly growing cumulus cloud
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  Precipitation and StormsStorms: Thunderstorms: Anvil head clouds- anvil head forms as cloud begins to flatten out. Downbursts- concentrated blasts of cool wind that blow downward at 130 mph or more. Dissipating Stage- when all the lower portion of the thundercloud is downdrafts Cell- updraft system Supercell-single, updraft giant