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Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
Clouds and percipitation powerpoint
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Clouds and percipitation powerpoint

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  • 1. CLOUDS AND PERCIPITATION BY SARAH MURPHY
  • 2. Adiabatic Temperature Changes and Expansion and Cooling• Temperature changes even though heat isnt added or subtracted.• When air expands, it cools. When air compresses, it warms up.• Dry adiabatic rate:Rate of adiabatic warming orcooling of unsaturated (dry) air.• Wet adiabatic rate:Rate of adiabatic temperaturechanges in saturated air. http://www.kidsgeo.com/geography- for-kids/0070-adiabatic-temperature- changes.php
  • 3. Orographic Lifting• Places that are elevated act as barriers, or walls, to air flow, making air rise.• Air cools, which may result in clouds appearing, and even precipitation. http://www.nc- climate.ncsu.edu/edu/k12/.Lifting Mechanisms
  • 4. Frontal Wedging• When masses of warm and cold air collide, it creates a front. http://santas usana.org/pa kelly/ES9CP/E S9%20clouds .htm
  • 5. Convergence• The collision of contrasting air masses make air rise. When air in the lower atmosphere flow together, air rises.• Air can’t go down, so it goes up, which leads to cooling, and sometimes makes clouds form. http://www.thekeytoisla m.com/en/scientific- explanations/clouds- and-rains.shtml
  • 6. Localized Convective Lifting• Air above a paved parking lot will warm up more than a wooded area. Air above the parking lot is less dense than the surrounding air.• During the summer, unequal heating of Earth’s surface causes some spots of air to be warmed up more than the rest of the surrounding air. http://rst.gsfc.nasa.gov/Sect14/Sect 14_1c.html
  • 7. Stability (Density Differences and Stability and Daily Weather)• Temperatures that are warmer than the surrounding air rise until it reaches an altitude where the temperature is equal.• Stable air stays in same place, unstable air rises.• Clouds won’t form when there is stable conditions in the atmosphere. http://stab ilitycloud.c om/
  • 8. Condensation• The air must be saturated in order for water vapor in the air to form dew, fog or clouds.• Saturation occurs when air is cooled to its dew point, but saturation doesn’t really occur when water vapor is in the air.http://decorating.visitacasas.com/how-to-combat-condensation/
  • 9. Types of Clouds• Cumulus clouds:Round, individual clouds.Flat based, rising into dome or tower-like shapes.• Cirrus clouds:White and thin, high in the sky.• Stratus clouds:Layers that cover up most of the sky.No distinct individuality. http://www.xconomy.com/bo ston/2011/03/22/clouds- clean-air-cancer-and-cardio- some-massachusetts- companies-on-the-rise/
  • 10. High Clouds• Cirrus, cirrostratus, and cirrocumulus.• Thin and white.• Made of ice crystals, due to low temperature, and high altitude. http://scienceray.com/earth- sciences/meteorology/clouds- types-and-how-they-are-formed/
  • 11. Middle Clouds• Ranges from 2000 – 6000 meters high.• Altocumulus clouds.• Larger and denser than cirrocumulus clouds. http://scienceray.com/earth- sciences/meteorology/clouds- types-and-how-they-are-formed/
  • 12. Low Clouds• Stratus, stratocumulus, and nimbostratus clouds.• Fog-like, covers most of the sky.• Nimbostratus clouds produce precipitation. http://scienceray.com/earth- sciences/meteorology/clouds- types-and-how-they-are-formed/
  • 13. Clouds of Vertical Development• Clouds that do not fall in the 3 height categories are associated with unstable air.• The end result of clouds with great vertical forms are rain showers or thunderstorm. http://www.uwgb.edu/du tchs/EarthSC102Notes/10 2Clouds.htm
  • 14. Fog by Cooling and by Evaporation• Fog is clouds that are very low to the ground.• Fog that is caused by cooling usually forms where moist and warm air is carried to the shorelines by prevailing winds.• Fog that is caused by evaporationforms when cool air moves overwarm air, which rises due to thedifferent kinds of air meeting. http://www.brainhar monycenter.com/brai n-fog.html
  • 15. Cold Cloud Precipitation (Bergeron Process)• The Bergeron Process relies on supercooling and supersaturation to freeze the water in the air.• Pure water in the air doesn’t freeze until it reaches -40 degrees Celsius, instead of 0 degrees Celsius. http://alibanfm.wordpress.com/
  • 16. Warm Cloud Precipitation (Collision-Coalescence Process)• Water absorbing particles can remove water vapor from the air, which forms droplets that are big.• The big drops collide with smaller droplets in the air. http://www.cbs 6albany.com/sec tions/weather/r esearch/topics/t opicfive/
  • 17. Rain and Snow• The term rain means drops of water that fall from a cloud and have a diameter of about 0.5 mm. Anything smaller is called a drizzle.• Snowflakes usually melt before they hit the ground.• Snow is made up of 6 sided ice crystals. http://warebuzz.com/dx-winter-snow- screensaver.html
  • 18. Sleet, Glaze and Hail• Glaze is supercooled freezing rain.• Hail is made in cumulonimbus clouds.• Sleet is the fall of small particles of clear or transparent ice. http://cocorahs.or g/Content.aspx?p age=hail

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