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Weather and Climate


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Weather and Climate
Chapter 19

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Weather and Climate

  2. 2. WEATHER – describe the condition in the atmosphere at a particulartime, on a particular day in a particular place.• CLIMATE - describes the average of all weather conditions in a particular place over many many years, usually decades.
  3. 3. ELEMENTS OF WEATHER• 1. TEMPERATURE – is the most important element of weather as it influences humidity, precipitation, air pressure, wind speed and direction,and cloud formation.• 2.HUMIDITY – is the amount of water vapor present in the atmosphere. – RELATIVE HUMIDITY – refers to the ratio of moisture actually present in the air compared to what the air can hold at a given temperature. – HYGROMETER – used to measure humidity. 3. ATMOSPHERIC PRESSURE - pressure exerted by air.
  4. 4. HIGH PRESSURE AREAS – areas where the air is thicker. ( produces a good weather )LOW PRESSURE AREAS – areas where the air is not thick ( produces a bad weather )• 4. WIND AND AIR MASSES – WIND – moving air (continual rising and falling of air) - it blows from an area of high pressure to an area of low pressure 2 GENERAL TYPES OF WIND A. LOCAL WINDS – flow from any direction and usually cover short distances. B. GLOBAL WINDS - blow from a specific direction and almost always travel longer distances.
  5. 5. MINOR WINDS• 1. SEA BREEZE - the wind that blows from the sea towards the land during daytime.• 2. LAND BREEZE – the wind that blows from the land to the sea during the night.
  6. 6. AIR MASS - An air mass is a body of air that extends over a large areaand has nearly uniform temperature and humidity in any horizontaldirection.When air masses meet, there is a mixing of cold and warm air, thismixing will cause a disturbance in the atmosphere, and a thunderstormmay result.It may also result in FRONTS.
  7. 7. FRONT – 2 air masses that meet at a certain point.TYPE OF FRONT ASSOCIATED WEATHER1. COLD ( when a mass Short precipitation occurs quickly but of cold air meets & may be heavy, more violent storms, rapid replaces a mass of movement, cooler temperature warm air)2. WARM ( when a mass of Prolonged gentle precipitation, slowwarm air overtakes a cold movement, warm temperatureair mass & moves over it)3. OCCLUDED ( cold front Complex weather, light rainshowersovertakes a warm front & is maybe followed by thunder storm,rushed upward) precipitation caused by rising warm air.4. STATIONARY ( warm air Long periods of the same weather,mass meets a cold air mass weather changes when front begins to& no movement occurs ) move.
  8. 8. 5. CLOUD FORMATION• Water vapor and dust are involve in cloud formation.• Clouds are formed as water condenses on particles called condensation nuclei in the atmosphere.
  9. 9. TYPES OF CLOUDS• 1. CIRRUS - are thin and wispy.  Formed at the highest altitudes usually between 6000 – 10 000 m above the surface of the earth.
  10. 10. 2. CUMULUS – are thick and puffy, with flat bottom. They look likecotton balls piled together. They are generally low clouds and knownas ― fair weather‖ clouds.
  11. 11. STRATUS – are layered and sprea out over the whole sky like ablanket. Gentle rain may produced by stratus clouds.
  12. 12. NIMBUS – ( rain ) dark and heavy rain cloud that is going to bring rain.
  13. 13. 6. PRECIPITATION – is the transfer of water from atmosphere back tothe earth’s surface. ( rain, snow, hail, sleet )FORMS OF PRECIPITATION DESCRIPTION1. RAIN formed when snow melts as it falls2. Snow Water vapor changes directly into solid crystals3. SLEET Snow melts and falls through layers of cold air where it freezes4. HAIL Sleet is pushed up and down in the atmosphere until it grows larger
  14. 14. snow
  15. 15. hail
  16. 16. WEATHER DISTURBANCES• 1. THUNDERSTORM – is a small scale weather system with lightning and thunder, produced by cumulonimbus cloud that has a funnel shape, usually producing gusty winds, heavy rain and sometimes hail.
  17. 17. 2. TROPICAL CYCLONE - is a low pressure system which generallyforms over the tropics with wind and thunderstorm activity.It comesfrom Greek word KYKLOS w/c means ― cycling snake ‖.• They are huge, violent whirlwinds that happen in many parts of the earth.• They are weather systems that rush in a spiral motion from different diections to a low pressure center called the ― eye of the storm ‖.
  18. 18. 1. TROPICAL DEPRESSION – tropical cyclones with maximum sustainedsurface winds of less than 62kph.• 2. TROPICAL STORM – tropical cyclone that reaches wind of at least 62kph. ( name is given )• 3. THYPOON – if winds reach 118kph• HURRICANE – in Atlantic – PAGASA – Philippine Atmospheric, Geophysical, Astronomical Services Administration
  19. 19. SOUTHWEST MONSOON – ( HABAGAT ) comes from the word ―mausim‖ which means seasonal wind. It si generally warm and dry burpicks up moisture as it passes the warm waters Of Indonesian Sea andmoves toward the equator with a low pressure.This brings rain to manyparts of the Phil. From May to September.• Northeast monsoon – ( amihan ) comes in October to February and brings rain mostly in Mindanao.• INTERTROPICAL CONVERGENCE ZONE (ITCZ ) – is the meeting place of hot and cold tradewinds in the northern and southern hemispheres. It may result in rain showers to heavy rains in affected areas.
  20. 20. WEATHER INSTRUMENTS• 1. BAROMETER – measures air pressure. It was built by an Italian named Evagelista Toricelli.
  21. 21. RAIN GUAGE – measures amountof precipitation
  22. 22. THERMOMETER – measures airtemperature
  23. 23. LIGHTNING DETECTOR – it detects through radio frequency theactivity of a storm. It indicates the distance of a lightning, and whethera storm is approaching or departing.
  24. 24. Psychrometer – measures relativehumidity.
  25. 25. WIND VANE – measures windspeed
  26. 26. Weather balloon – it is sent into the atmosphere to note the weatherconditions at very high altitudes
  27. 27. Weather satellite – it takes and sends photographs of air movementsover large areas from the outer space.
  28. 28. CLIMATE CHANGE• 1. EL NINO SOUTHERN OSCILLATION – The term El Niño—Spanish for "the Christ Child"—was originally used by fishermen to refer to the Pacific Ocean warm currents near the coasts of Peru and Ecuador that appeared periodically around Christmas time and lasted for a few months. Due to those currents, fish were much less abundant than usual. At the present time we use the same name for the large-scale warming of surface waters of the Pacific Ocean every 3-6 years, which usually lasts for 9-12 months, but may continue for up to 18 months, and dramatically affects the weather worldwide. best- known for its association with floods, droughts and other weather disturbances in many regions of the world, which vary with each event