1 / 12

Water and Weather

Water and Weather. Weather and Water. Most weather we pay attention to involves water. http://img.dailymail.co.uk/i/pix/2008/04_01/tornadoDM3030a_800x533.jpg. http://blogs.reuters.com/wp-content/uploads/2007/07/storm1.jpg. http://img.dailymail.co.uk/i/pix/2008/04_01/tornadoDM3030d_468x312.jpg.

myrrh
Télécharger la présentation

Water and Weather

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Water and Weather

  2. Weather and Water • Most weather we pay attention to involves water http://img.dailymail.co.uk/i/pix/2008/04_01/tornadoDM3030a_800x533.jpg http://blogs.reuters.com/wp-content/uploads/2007/07/storm1.jpg http://img.dailymail.co.uk/i/pix/2008/04_01/tornadoDM3030d_468x312.jpg

  3. Important Terms • Humidity – amount of water vapor in the air • Relative Humidity - ratio of water vapor in an area relative to how much it can hold • warm air can hold more water than cold air before becoming saturated – can hold no more water vapor • (pressure also a factor) • Expressed as a % • Does not tell you actual quantity of water vapor in air http://wpcontent.answers.com/wikipedia/en/4/41/Relative_Humidity.png

  4. Important Terms http://fuffer.files.wordpress.com/2008/03/humidity-smaller.jpg

  5. Important Terms • Dew Point – temperature air must be cooled at to reach saturation (100% relative humidity) • High dew point temps = moist air • Low dew point temps = dry air • At the dew point water vapor can condense • at night low temps near ground cause water vapor to condense  dew/fog • very cold temps near ground cause water vapor to freeze and fall out  frost • during the day, as warm air rises, it cools and often becomes saturated  clouds

  6. Dew Point Mean daily average dew point temperature in October http://www.climatesource.com/us/fact_sheets/td_us.gif

  7. Cloud Formation • Clouds form as warm, moist air rises, expands, and cools • As air cools, it can hold less water – relative humidity increases • When air reaches dew point (100% relative humidity), the water condenses (goes from gas to liquid) around a piece of dust, sea salt, or other particle (condensation nuclei) • When millions of water droplets collect, cloud is formed http://www.cmmap.org/images/learn/clouds/sfcHeat.jpg

  8. Cloud Formation http://www.vivoscuola.it/US/RSIGPP3202/umidita/lezioni/formation2.GIF http://www.weatherquestions.com/Cloud_formation_convective.gif

  9. Cloud Formation • May also form when wind hits a mountain and has nowhere to go but up  air rises, expands, and cools • Can also form when air masses of different temps collide  warmer air is forced up above cool air mass where it expands and cools http://www.cmmap.org/images/learn/clouds/risingAir.jpg

  10. Cloud Formation • Types of cloud form: • at different altitudes • High • Middle • Low • into different shapes • Cirrus • Cumulus • Stratus • Make Clouds lab • Build Cloud Spotters • Monitor clouds for 1 week http://marktwainmediascience.com/CD-410015.jpg

  11. Precipitation • Cloud droplets collide and combine into bigger droplets (coalescence) • When droplets are too heavy, they fall (precipitation) • May fall as liquid or solid or something in between (rain, snow, sleet, hail) http://www.mmm.ucar.edu/research_mmm/processes/images/ice_illustration.png

  12. Precipitation • How does water get in the air in the first place? • Evaporation radiation heats up water and causes phase change • Warm surface water (oceans) evaporates faster than cold http://www.cotf.edu/ete/images/modules/msese/earthsysflr/EFCycleP3.gif

More Related