Precipitation

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Precipitation

  1. 1. Weather Clouds and Precipitation
  2. 2. Have you ever just looked at clouds? <ul><li>Why do we have clouds? </li></ul><ul><li>Why are there different shapes? </li></ul><ul><li>What can they tell us about the weather? </li></ul>
  3. 3. Take Good Notes! <ul><li>There will be a quiz on this information </li></ul>
  4. 4. Understanding Clouds <ul><li>Clouds form as warm air is forced upward </li></ul><ul><li>As the air is forced upward, it expands and cools </li></ul>
  5. 5. Understanding Clouds <ul><li>As the air cools, the relative humidity reaches 100% </li></ul><ul><li>For more information on Relative Humidity click ☼ </li></ul>
  6. 6. Water vapor begins to condense in tiny drops around nuclei. Nuclei are small particles of dust, salt, and smoke in the atmosphere
  7. 7. Cloud Types <ul><li>There are many different cloud types </li></ul>
  8. 8. Cloud Types <ul><li>Can you think of the two main ways that clouds are classified? </li></ul><ul><li>Shape , Height , and sometimes Rain Capacity </li></ul>
  9. 9. By Shape! <ul><li>There are three main cloud types that are based on shape </li></ul><ul><li>Think you know any of them? </li></ul><ul><li>Stratus </li></ul><ul><li>Cumulus </li></ul><ul><li>Cirrus </li></ul>
  10. 10. Stratus Clouds <ul><li>Stratus clouds form a smooth, even sheet </li></ul><ul><li>They usually form at low altitudes </li></ul>
  11. 11. Stratus Clouds <ul><li>When air is cooled and condenses near the ground, a stratus cloud know as _______ forms </li></ul><ul><li>Know the name? </li></ul>
  12. 12. FOG!
  13. 13. Cumulus Clouds <ul><li>These are masses of puffy, white clouds, often with flat bases </li></ul><ul><li>They form when air currents rise </li></ul>
  14. 14. Cumulus Clouds <ul><li>They can be associated with both fair weather and…….when they get really tall ___! </li></ul>
  15. 15. Thunderstorms!
  16. 16. Cirrus Clouds <ul><li>Cirrus clouds are high, thin, white, feathery clouds containing ice crystals </li></ul>
  17. 17. Cirrus Clouds <ul><li>Cirrus clouds are usually associated with fair weather, but they may indicate approaching storms </li></ul>
  18. 18. By Height <ul><li>The prefix of cloud names can describe the height of cloud bases </li></ul><ul><li>Cirro: High clouds above 6000m </li></ul>
  19. 19. By Height <ul><li>Alto: Middle elevation clouds between 2000 to 6000m </li></ul><ul><li>Strato: Low level clouds below 2000m </li></ul>
  20. 20. Rain Clouds <ul><li>Nimbus clouds are dark clouds associated with precipitation </li></ul>
  21. 21. Rain Clouds <ul><li>When a nimbus cloud is also a towering cumulus cloud, it’s called a cumulonimbus cloud </li></ul>
  22. 22. Ready for a quick review? <ul><li>1. Clouds can form when the relative humidity reaches ____% </li></ul><ul><li>2. In order for clouds to form, water vapor begins to condense around ____of dust, salt, and smoke </li></ul>
  23. 23. <ul><li>3. Clouds are classified by ____ and____ and sometimes rain capacity </li></ul><ul><li>4. Puffy, white clouds are called? </li></ul><ul><li>5. Mid elevation clouds between 2000 and 6000m </li></ul>
  24. 24. Let’s see how you did! <ul><li>100 </li></ul><ul><li>Nuclei </li></ul><ul><li>Shape and height </li></ul><ul><li>Cumulus </li></ul><ul><li>Alto </li></ul>
  25. 25. Forms of Precipitation <ul><li>Precipitation (pre-sip-uh-tay-shun) is any form of water that falls to the Earth's surface . </li></ul>
  26. 26. Types of Precipitation <ul><li>The type of precipitation that falls to the ground depends upon the formation process and the temperatures of the environment between the cloud and the surface </li></ul>
  27. 27. Can you name the different types of precipitation? <ul><li>Rain </li></ul><ul><li>Snow </li></ul><ul><li>Hail </li></ul><ul><li>Sleet </li></ul><ul><li>Freezing Rain </li></ul>
  28. 28. Rain <ul><li>Rain develops when growing cloud droplets become too heavy to remain in the cloud and as a result, fall toward the surface as rain </li></ul>
  29. 29. <ul><li>Rain can also begin as ice crystals that collect each other to form large snowflakes </li></ul><ul><li>As the falling snow passes through the freezing level into warmer air, the flakes melt </li></ul>
  30. 30. Rain from snow!
  31. 31. Snow <ul><li>Snow is formed when ice crystals form from water vapor that is in the clouds directly above your heads! </li></ul><ul><li>This process is called sublimation </li></ul>
  32. 33. Hail <ul><li>Hail is formed when updrafts carry raindrops upwards into extremely cold areas of the atmosphere </li></ul>
  33. 34. Hail <ul><li>There the raindrops merge and freeze. When the frozen clumps get to heavy they fall to earth </li></ul>
  34. 35. Hail <ul><li>Hail can vary in size, from the size of a small stone to that of a baseball! So be careful </li></ul>
  35. 36. Sleet <ul><li>Sleet is frozen raindrops. Sleet begins as rain or snow and falls through a deep layer of cold air that contains temperatures below freezing that exist near the surface . </li></ul>
  36. 37. Sleet <ul><li>Rain that falls through this extremely cold layer has time to freeze into small pieces of ice </li></ul>
  37. 38. Freezing Rain <ul><li>Freezing rain is falling rain that cools below 0°C, but does not turn to ice in the air </li></ul><ul><li>The water is “ supercooled ” </li></ul>
  38. 39. When the drops hit anything they instantly turn to ice!
  39. 40. Quiz Time
  40. 41. <ul><li>Nuclei for the formation of rain drops can be small particles of: A) salt, B) smoke, C) dust, D) all the above </li></ul><ul><li>Which of these cloud types is not based on the clouds shape: A) stratus, B) nimbus, C) cumulus, D) cirrus </li></ul>Ready?
  41. 42. <ul><li>3 . Mid elevation clouds between 2000 and 6000m: A) nimbus, B) alto, C) cirro, D) strato </li></ul><ul><li>4 . This form of precipitation is supercooled: A) rain, B) snow, C) sleet, D) freezing rain </li></ul>
  42. 43. <ul><li>5. This form of precipitation stays frozen all the way to the ground: A) rain, B) snow, C) sleet, D) freezing rain </li></ul><ul><li>Let’s see how you did! </li></ul>
  43. 44. The Answers! <ul><li>1. D </li></ul><ul><li>2. B </li></ul><ul><li>3. B </li></ul><ul><li>4. D </li></ul><ul><li>5. B </li></ul>
  44. 45. The End!
  45. 46. Humidity and Relative Humidity <ul><li>Humidity is the amount of water vapor in the air </li></ul><ul><li>Relative humidity is a measure of the amount of water vapor that the air is holding, compared to the amount it can hold at a specific temperature </li></ul>
  46. 47. Humidity and Relative Humidity <ul><li>When the air is holding as much moisture as it can, it’s said to be saturated </li></ul>
  47. 48. Can you explain this graph?
  48. 49. <ul><li>In the cool of the morning, the air can’t hold as much moisture. We often have dew on a summer morning </li></ul><ul><li>Once the air has warmed, the relative humidity drops since the air can hold more moisture </li></ul>
  49. 50. You’ve seen water on the outside of a cold drink? <ul><li>The cold air around the glass causes a lower temperature at which the air is saturated </li></ul>
  50. 51. You’ve seen water on the outside of a cold drink? <ul><li>The temperature at which air is saturated and condensation takes place is the dew point </li></ul><ul><li>To return click here ☼ </li></ul>

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