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Weather

Weather. Webster’s New Collegiate Dictionary : “state of the atmosphere with respect to heat or cold, wetness or dryness, calm or storm, clearness or cloudiness” GLOBE : “By weather we mean what is happening in the atmosphere today, tomorrow, or even next week.”.

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Weather

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  1. Weather

  2. Webster’s New Collegiate Dictionary: “state of the atmosphere with respect to heat or cold, wetness or dryness, calm or storm, clearness or cloudiness” • GLOBE: “By weather we mean what is happening in the atmosphere today, tomorrow, or even next week.” • Climate – “the average course or condition of the weather at a place usually over a period of years as exhibited by temperature, wind velocity, and precipitation”

  3. Major elements of weather • Temperature • Humidity • Atmospheric pressure • Precipitation • Wind direction and speed

  4. Thermometer

  5. Thermometers measure air temperatures. Thermometers work because matter expands when heated. Most thermometers are closed glass tubes containing liquids such as alcohol.

  6. Max_Min_Thermometer

  7. Dry and wet bulb Thermometer

  8. Psychrometer

  9. A psychrometer measures the humidity of the air. • One of the two thermometers has a wick (cloth cover) which is dipped in distilled water. • Evaporation of water from the wick on the wet bulb thermometer leads to cooling. • Using a Relative Humidity Table, the temperature difference between the two thermometers gives the relative humidity of the air (in percent).

  10. Smartphone

  11. Stevenson screen

  12. Atmospheric pressure • A barometer measures air pressure. • There are two types of Barometers: Mercury Barometer and Aneroid Barometer.

  13. Mercury Barometer • A Mercury Barometer consists of a glass tube inserted into a dish of mercury or colored denatured alcohol.

  14. Barometer

  15. Barometer

  16. An Anemometer measures the wind speed. The cups catch the winds, turning a dial attached to the instrument.

  17. Anemometer

  18. Measuring Precipitation • Rain is easy to measure—all you need is an “open tube with a ruler”—a RAIN GAUGE. • “Tipping bucket” rain gauges can measure rainfall outside and connect to show a display inside.

  19. precautions are necessary in order to get reliable data from the rain gauge Collection of rain data in a hurricane can be nearly impossible andunreliable due to wind extremes. Rain gauges only indicate rainfall in a localized area. When the temperature is close to or below freezing. Rain may fall on the funnel and freeze or snow may collect in the gauge and not permit any subsequent rain to pass through. Rain drops will stick to the sides or funnel of the collecting device, such that amounts are very slightly underestimated, and those of .01 inches or .25 mm may be recorded as a trace. Rain gauges should be placed in an open area where there are no obstructions, such as building or trees, to block the rain. This is also to prevent the water collected on the roofs of buildings or the leavesof trees from dripping into the rain gauge after a rain, resulting in inaccurate readings.

  20. What is a Cloud? • A collection of water droplets • Why White? -They are white, because they reflect the color of the sun. • Why Gray? – They are gray when the sun is unable to shine through.

  21. Groups of clouds • There are three groups of clouds. • High Clouds - Cirrus • Medium Clouds - Alto • Low Clouds - Cumulus

  22. There are three types of high-level clouds: • Cirrus • Cirrostratus • Cirrocumulus

  23. There are two types of medium-level clouds: between 6,500 – 18,000 feet in the air. • Altostratus • Altocumulus

  24. There are three types of low-level clouds: only go up to 6,500 feet in the air. • Stratus • Stratocumulus • Nimbostratus

  25. Cirrus Clouds • Cirrus (meaning "curl") clouds made of ice. Even in the summer, cirrus clouds are made of ice because it is cold high above Earth. • Cirrus clouds are above 18,000 feet. • They are long and wispy. • Usually mean good weather.

  26. Cumulus • Cumulus (meaning "heap") clouds are the large clouds that sometimes look like huge puffs of cotton. Sometimes these clouds look like animals or familiar things. It is fun to use your imagination to make up stories about the clouds.

  27. Cumulonimbus • Sometimes cumulus clouds get dark gray and rain or hail falls from them. They are then called cumulonimbus clouds. These clouds often produce lightning and thunder. Nimbus always tells us that a cloud brings rain.

  28. Stratus • Stratus (meaning "stretched out") • Stratus clouds cover the whole sky. • Looks like fog in the sky. • Brings light rain.

  29. Windy

  30. Sunny

  31. Thunderstorm

  32. Heavy rain

  33. Hurricane

  34. Snowing

  35. Cloudy

  36. Reference http://www.ambientweather.com/ http://www.cocorahs.org www.accumall.com www.novalynx.com www.youtube .com www.wikipedia.com

  37. Thank You M. Panigrahy G.M.I.S.,Jakarta

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