Weather patterns

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Weather patterns

  1. 1. Wind, Clouds,and Precipitation
  2. 2. WINDS
  3. 3. DIFFERENCES IN AIR PRESSURE UNEQUAL HEATING OF AIR
  4. 4. Responsible fortriggering the initial movement of air.
  5. 5. CORIOLIS EFFECT SHIFT IN WIND DIRECTION DUE TO EARTH’S ROTATION
  6. 6. As air moves from high to low pressure in the northern hemisphere, it is deflected to theright by the Coriolis force. In the southern hemisphere, air moving from high to lowpressure is deflected to the left by the Coriolis force.
  7. 7. Flushing Toilets on the EquatorMyth or Real:Toilets flushed in the northern hemisphereapparently spin to the right, in the southernhemisphere the water spins left -- this issupposedly caused by the Coriolis effect. Andon the equator? Its a straight shot down.
  8. 8. http://www.phschool.com/atschool/phsciexp/a ve_art/global_winds/index.html
  9. 9. The global wind belts are formed by two main factors:the unequal heating of the earth by sunlight and the earths spin. The unequal heating makes the tropical regions warmer than the polar regions. As a result, there is generally higher pressure at the poles and lower at the equator. Source: http://www.islandnet.com/~see/weather/whys/globalwinds.htmThe atmosphere tries to send the cold air toward the equator atthe surface and sends warm air northward toward the pole athigher levels.
  10. 10. Click on the link to watch an animation: Animation 1 Animation 2http://www.mhhe.com/biosci/g http://www.geography.hunter.cuny.edu/~tenbio/tlw3/eBridge/Chp29/ani bw/wc.notes/7.circ.atm/animations/Globamations/ch29/global_wind_circ lWind.html ulation.swf
  11. 11. Earth’sWinds
  12. 12. GLOBAL WINDS UNEQUAL HEATING EQUALSGLOBAL PATTERN OF AIR CIRCULATION
  13. 13. LOCAL WINDS LAND BREEZE SEA BREEZE MONSOON
  14. 14. SEASONAL WINDS MONSOONS CARRIES WARM MOIST AIR
  15. 15. PhilippinesNortheast Monsoon (cold and wet)Southwest Monsoon (dry)
  16. 16. DOLDRUMS CALM SURFACE WINDS AT EQUATOR (0 degrees latitude)
  17. 17. TRADE WINDS AIR MOVING BACK TO THE EQUATOR FORMING A BELT OF WARM, STEADY WINDS
  18. 18. HORSE LATITUDES 30 degrees North and South of Equator Warm air cools and sink; clear skies; winds are calm
  19. 19. PREVAILING WESTERLIES 40-60 degrees Latitude (West to East) Strong Winds
  20. 20. POLAR EASTERLIES COLD BUT WEAK WINDS EAST TO WEST
  21. 21. http://www.phschool.com/atschool/phsciexp/a ve_art/global_winds/index.html
  22. 22. JET STREAMS “rivers of air" ABOVE 12 KMS 180-350 Km/Hr (speed)
  23. 23. CLOUDS
  24. 24. http://www.youtube.com/watch?v=ODImMpGFUa4&feature=related
  25. 25. http://video.about.com/weather/How-Do-Clouds-Form-.htm
  26. 26. MOISTURE CONDENSES ON SMALL PARTICLESOF DUST/ SOLIDS IN THE AIR
  27. 27. DEW POINTTEMPERATURE AT WHICH AIR CONDENSES
  28. 28. MOLECULES COLLIDEAND REBOUND SPEED DECREASES WHY RISING AIR COOLS
  29. 29. CONDENSATIONWATER VAPOR CHANGES INTO LIQUID
  30. 30. CLOUD FORMATIONWATER VAPORCONDENSATION NUCLEILOW TEMPERATURE
  31. 31. Source: http://www.vivoscuola.it/US/RSIGPP3202/umidita/lezioni/form.htm
  32. 32. Why do clouds have flat bottoms? Dew point
  33. 33. Clouddroplets Ice Snow
  34. 34. TYPES OFCLOUDS
  35. 35. When warm air rises, other cooler air rushes in to take its place. The air thatrushes in moves parallel to the ground. It is this moving air that we call“wind”.Wind is caused by the uneven heating of the earth’s surface. Air that movesup and down is important in making winds. This is called a current.Warm air near the surface of the Earth can hold more moisture than cool airabove the Earth’s surface.Water from the Earth’s lakes, oceans, land surfaces, and plants evaporatesinto this warmer air. Eventually, the warm moisture-filled air rises andbecomes cool. Now the air can no longer hold all the moisture it hadacquired when it was near the surface of the Earth. As a result, much of thewater vapor in the air condenses.Water vapor that condenses and forms clouds can fall to the Earth asrain, sleet, snow, or hail. Water that falls from the atmosphere tothe Earth is called precipitation.
  36. 36. Hurricanes/Typhoons/Cyclones & Tornadoes
  37. 37. http://www.youtube.com/watch?v=zP4rgvu4xDE
  38. 38. A hurricane is a tropical storm that has winds of 119 kilometers per hour or higher. A hurricane begins over warm water as a low-pressure area, or tropical disturbance. If the tropical disturbance grows in size and strength, it becomes a tropical storm, which may then become a hurricane. http://www.youtube.com/watch?v=5iN352idLks&feature=fvwrel How Hurricanes Form
  39. 39. http://www.youtube.com/watch?v=5iN352idLks&feature=fvwrel How Hurricanes Form
  40. 40. Hurricanes/typhoons/cyclones-what’s in a name?LOCATION, LOCATION, LOCATIONhttp://spaceplace.nasa.gov/hurricanes/
  41. 41. HOW?
  42. 42. hurricanes/typhoons and tornadoes spin COUNTER-CLOCKWISE in NORTH H H H H
  43. 43. http://edition.cnn.com/2011/US/04/28/severe.weather/index.html?hpt=T2http://edition.cnn.com/2011/US/04/27/tornado.outbreak/index.html?hpt=T1Experts: Severeweather acrossSouth could settornado record
  44. 44. http://news.yahoo.com/s/yblog_thelookout/2 0110428/ts_yblog_thelookout/watch- tuscaloosas-terrifying-tornado Yahoo video clips Tornado Outbreak of 2011The jet stream is the main reason for allthe severe weather. The warm humidair from the south is clashing with thecool dry air coming down from Canadaand where the two meet is where wefind severe thunderstorms andtornadoes.
  45. 45. Including yesterdays storm, therehave been a whopping 800 reportsof tornadoes in April, easilysurpassing April 2003s all-timerecord of 543 twisters. http://www.nytimes.com/interactive/20 11/04/28/us/map-of-the-tornadoes- across-the-south.html
  46. 46. Tornadoes Song:http://www.youtube.com/watch?v=iOw6ONcKk4g
  47. 47. http://www.youtube.com/watch?v=cvOut9VUqKY&feature=fvwrel
  48. 48. http://news.yahoo.com/s/yblog_thelookout/2 0110428/ts_yblog_thelookout/watch- tuscaloosas-terrifying-tornado Yahoo video clips TornadoesA tornado is a rapidly whirling, funnel-shapedcloud that reaches down from a storm cloud totouch Earth’s surface.Tornadoes develop in low,heavy cumulonimbusclouds—the same clouds that bringthunderstorms.
  49. 49. http://www.youtube.com/watch?v=3Qu9wR03GV http://www.youtube.com/watch?v=VQDkmziz A&feature=related 1n8&feature=fvwrel http://www.youtube.com/watch?v=NTjR91JC850

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