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Weather

Weather. Weather Factors. Air Temperature Molecules always moving Measure of the average amount of molecule motion Measured by a thermometer. Temperature high  molecules move more rapidly feels warm Temperature low molecules move slowly feels cool. Weather Factors. Wind

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Weather

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  1. Weather

  2. Weather Factors • Air Temperature • Molecules always moving • Measure of the average amount of molecule motion • Measured by a thermometer • Temperature high molecules move more rapidly feels warm • Temperature low molecules move slowly feels cool

  3. Weather Factors • Wind • Sun warms Earth’s surface  warms air above – air expands & rises low pressure • Cold dense air sinks  high pressure • CAUSES the wind- air moves from areas of high to low pressure • Measured by: direction weather vane weather sock Speed anemometer

  4. Weather Factors • Humidity • Measured by a hygrometer • Warm moist air  more vapor moves fast Molecules

  5. Weather Factors • Humidity • Cold air  less vapor moves slowly Because molecules move slowly the water vapor sticks & forms droplets= condensation

  6. Weather Factors • Relative humidity • Amount of water vapor in air compared to amount needed for saturation (most it can hold)

  7. Weather Factors • Air pressure • Weight of air pressing down on surface • Measured by barometer

  8. Cloud Formation: • warm moist air condenses in tiny droplets around dust and salt particles • Particles remain suspended- billions of these form clouds

  9. Classified by • Height • cirro = high • alto= middle • strato= low • example • cirrostratus= high layer of stratus clouds • Altocumulus=middle layer of cumulus clouds

  10. Explain what stratus clouds look like:

  11. Classified by: • Shape • Stratus – smooth even sheets (layers) Low altitudes Fair weather Fog= stratus cloud near ground

  12. Describe cumulus clouds:

  13. Cumulus- • puffy white with flat bases Fair weather

  14. Describe Cirrus Clouds:

  15. Cirrus- • high thin white feathery Made of ice crystals • Fair weather • Signals approaching storms

  16. Describe nimbostratus

  17. Rain clouds • Nimbus = dark • Nimbostratus • dark layered clouds • long steady rain/snow

  18. Describe cumulonimbus clouds

  19. Rain clouds • Cumulonimbus • dark puffy clouds • thunderstorms

  20. Precipitation • Cloud droplets grow large enough to fall • Type determined by temperature

  21. Rain • Water falling in temperatures above freezing (32°) Above 32°

  22. Snow Below 32° • Water falling in freezing temperatures that vapor changes directly to solid

  23. sleet Above 32° • Rain passes through freezing temps near Earth’s surface forming ice pellets Below 32

  24. Hail • Water drops freeze in layers around small nuclei of ice in cumulonimbus clouds during a thunderstorm grow larger by being tossed up and down by air in clouds

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