Weather fronts


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Weather fronts

  1. 1. Weather FrontsNRHS Physical Science
  2. 2. Weather and FrontsWorksheet 1Cold fronts occurwhen a colder airmass replaces awarmer air mass. In acold front the cold airfollows the warm air,and, because cold airis denser, pusheswarm air out of itsway, forcing the warmair to rise. Animation of a cold front, author: Dr. Horst Rudolf, university of Bielefeld in cooperation with his pupils source:
  3. 3. Weather and FrontsWorksheet 1 (cont.) The lifting warm airmass becomescooler, and clouds startto form. Precipitation atcold fronts are usuallyheavier although lessextensive (50-70 km) andless prolonged. Thereason for this is that theuplift of warm air there ismore strong due to theundercutting of coldair, so towering cloudsform, andrain, thunderstorms, hailand tornadoes can occur. Animation of a cold front, author: Dr. Horst Rudolf, university of Bielefeld in cooperation with his pupils source:
  4. 4. Weather and FrontsWorksheet 1 (cont.)The air behind a coldfront is noticeablycolder and drier thanthe air ahead of it.When the cold frontpassesthrough, temperatures can drop more than15 degrees within thefirst hour Animation of a cold front, author: Dr. Horst Rudolf, university of Bielefeld in cooperation with his pupils source:
  5. 5. Worksheet 2Satellite View: A cold frontabove Middle EuropeImpressive swirl-structure of astrong cyclone with its centreabove the East sea:Having almost completelyoccluded the cold air movesalong a broad bow aboveNorthwest-, Middle- and EastEurope into the centre of thecyclone (well observable by theaerated and cellular picture ofclouds. The plains of Po-delta, inthe lee-side of the Alps, arealmost free of clouds. Furthereastwards a broad, bright bandof clouds marks the border tocontinental warm air abovesoutheast Europe; at this borderextreme weather appearancesare normal.
  6. 6. Worksheet 3Warm FrontsWarm fronts occur,when a warmer airmass approaches acolder air mass andgoes over the colderair. Warm fronts areusually more gentlethan cold fronts, moveslowly, gently settlingover the cold frontand moving it out ofthe way.
  7. 7. Worksheet 3 Precipitation at warm fronts are usually less heavy althoughWarm Fronts more extensive (300-400 km), than at the cold fronts.The air behind a warmfront is warmer andmore moist than the airahead of it. Warm frontsbring moresteady, lighter rain orsnow in front ofthem, which can lastfrom a few hours to The first signs of the warm frontseveral days. When a are the cirrus clouds, followed bywarm front passes the cirrostratus, altostratus,through, the air nimbocumulus and stratocumulusbecomes noticeably types of clouds.warmer and more humid
  8. 8. Weather Maps Front Maps•What is a low-pressuresystem? What is a high-pressure system? Whatkind of weather doeseach typically bring?•What is a cold front?What is a warm front?What types of weatherdoes each typicallybring?•Explain how the mapkey shows each of theterms above.
  9. 9. Weather Maps Satellite Maps•What do satelliteimages show? Why isthis informationimportant?•How do we getsatellite images? Howdo satellites travel?•What canmeteorologists learnby the shade of theclouds on a satelliteimage?
  10. 10. Weather Maps Radar Image Maps•What does radarshow?•How do you use themap key on a radarmap?•How do we get radarimages?•What are some of thelimitations of radarmaps?
  11. 11. Weather Maps Precipitation Maps•What isprecipitation?•What are someexamples ofprecipitation?•Define the differenttypes of precipitationon the map.•What causes differenttypes of precipitation?
  12. 12. Weather Maps Temperature Maps•What is temperature?(For the clearestdefinition, see the“Weather terms” chartin the backgroundarticle.)•What are the two mostimportant factors intemperature?•Why is it usually coolerat night?•Why does temperaturechange during theseasons?
  13. 13. Weather Maps Wind Speed Maps•Explain the maincause of winds.•Why are somewinds strongerthan others?•How does windaffect theweather?•How are windsnamed?
  14. 14. Bars/Lines/Circles Showing Pressure are Called Isobars
  15. 15. Bars/Lines/Circles Showing Pressure are Called Isobars When Isobars are far apart When Isobars are Gentile Wind close together Fast Wind And Gusts
  16. 16. Discussion Questions• Using the maps from the activity, choose one place in the country that had different weather from your hometown’s.• How do you think this weather affected kids in that area? How might their days have been different from yours? Think about what they wore, what they did for recess, and what they planned for after school.
  17. 17. Discussion Questions• Why is it helpful to use different types of weather maps?• When might some maps be more helpful than others?• For example, why might you be more interested in precipitation one day and wind speed the next?
  18. 18. Discussion Questions• Describe other maps you’ve seen in weather reports (examples: UV index, snowfall, pollen count).• Why are these maps important?