Weather unit and tools power point #1

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This PowerPoint goes into details about weather and the tools Scientists use to forecast the weather.

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Weather unit and tools power point #1

  1. 1. Weather
  2. 2. What do we know about weather? How do people measure and predict the weather?
  3. 3. Meteorologist • A scientist who studies the weather • What kind of tools do they use?
  4. 4. Thermometer • Used to measure temperature • measures the kinetic energy of air molecules • Fahrenheit & Celsius thermometers
  5. 5. Anemometer • Measures wind speed • a system of gears converts the number of turns per minute into wind speed
  6. 6. Hygrometer • Measures humidity • the moisture in the air
  7. 7. Weather Vane • Measures wind direction • changes in wind usually lead to change in weather
  8. 8. Barometer • Measures air pressure • high pressure = clear cool skies • low pressure = cloudy skies, moist air • extreme low pressure = stormy weather
  9. 9. Cloud Conditions • Observing clouds can tell a lot about the weather
  10. 10. Cumulus • White & puffy • fair weather
  11. 11. Cirrus • High in the sky • white • thin & wispy • fair weather
  12. 12. Stratus • Low in the sky • thick & gray • usually bring rain
  13. 13. Cumulonimbus • Tower high into the sky • gray to black • Thunderstorms, hail, tornadoes • anvil shaped
  14. 14. How can rising air pressure lead to a prediction about weather?
  15. 15. Air Mass • A large body of air that has the same temperature and humidity throughout • take on the characteristics of the region over which they form • 4 types in the the USA
  16. 16. Air Masses – Categorized by moisture content and temperature – Moisture categories: m = maritime (wet) and c = continental (dry) – Temperature categories: P (polar; cold), T (Tropical; warm)
  17. 17. Continental Polar • Cool dry weather
  18. 18. Continental Tropical • Hot dry weather
  19. 19. Maritime polar • Cool humid weather
  20. 20. Maritime Tropical • Warm wet weather
  21. 21. Front • Border where two air masses meet • most weather changes occur along a front • cold front = cold air mass moves under a warm air mass creating cumulonimbus clouds • warm front = a warm air mass moves over a cold air mass forming stratus clouds
  22. 22. What kind of air mass causes hot humid weather?
  23. 23. Climate • The regular weather pattern for a region • precipitation & temperature determine climate • seasonal patterns • all patterns are driven by the sun • proximity to the equator determines temperature patterns
  24. 24. ????? • What is the cause of the seasons? • What are two major factors of climate? • What kind of climate would you find near the equator? • What kind of climate would you find at the poles?

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