Weather fronts
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Cold fronts occur when a colder air mass replaces a warmer one, pushing the warm air up and causing heavier precipitation. Warm fronts are more gradual, with lighter and more widespread precipitation. When a cold front passes, temperatures can drop more than 15 degrees in an hour, while warm fronts bring warmer and more humid conditions.
Weather fronts
- 1. Weather Fronts NRHS Physical Science
- 2. Weather and Fronts Worksheet 1 Cold fronts occur when a colder air mass replaces a warmer air mass. In a cold front the cold air follows the warm air, and, because cold air is denser, pushes warm air out of its way, forcing the warm air to rise. Animation of a cold front, author: Dr. Horst Rudolf, university of Bielefeld in cooperation with his pupils source: http://www.learn-line.nrw.de/angebote/klima/medio/bilder/kfront.gif
- 3. Weather and Fronts Worksheet 1 (cont.) The lifting warm air mass becomes cooler, and clouds start to form. Precipitation at cold fronts are usually heavier although less extensive (50-70 km) and less prolonged. The reason for this is that the uplift of warm air there is more strong due to the undercutting of cold air, so towering clouds form, and rain, thunderstorms, hail and tornadoes can occur. Animation of a cold front, author: Dr. Horst Rudolf, university of Bielefeld in cooperation with his pupils source: http://www.learn-line.nrw.de/angebote/klima/medio/bilder/kfront.gif
- 4. Weather and Fronts Worksheet 1 (cont.) The air behind a cold front is noticeably colder and drier than the air ahead of it. When the cold front passes through, temperature s can drop more than 15 degrees within the first hour Animation of a cold front, author: Dr. Horst Rudolf, university of Bielefeld in cooperation with his pupils source: http://www.learn-line.nrw.de/angebote/klima/medio/bilder/kfront.gif
- 5. Worksheet 2 Satellite View: A cold front above Middle Europe Impressive swirl-structure of a strong cyclone with its centre above the East sea: Having almost completely occluded the cold air moves along a broad bow above Northwest-, Middle- and East Europe into the centre of the cyclone (well observable by the aerated and cellular picture of clouds. The plains of Po-delta, in the lee-side of the Alps, are almost free of clouds. Further eastwards a broad, bright band of clouds marks the border to continental warm air above southeast Europe; at this border extreme weather appearances are normal.
- 7. Worksheet 3 Warm Fronts Warm fronts occur, when a warmer air mass approaches a colder air mass and goes over the colder air. Warm fronts are usually more gentle than cold fronts, move slowly, gently settling over the cold front and moving it out of the way.
- 8. Worksheet 3 Precipitation at warm fronts are usually less heavy although Warm Fronts more extensive (300-400 km), than at the cold fronts. The air behind a warm front is warmer and more moist than the air ahead of it. Warm fronts bring more steady, lighter rain or snow in front of them, which can last from a few hours to The first signs of the warm front several days. When a are the cirrus clouds, followed by warm front passes the cirrostratus, altostratus, through, the air nimbocumulus and stratocumulus becomes noticeably types of clouds. warmer and more humid
- 9. Weather Maps Front Maps •What is a low-pressure system? What is a high- pressure system? What kind of weather does each typically bring? •What is a cold front? What is a warm front? What types of weather does each typically bring? •Explain how the map key shows each of the terms above.
- 10. Weather Maps Satellite Maps •What do satellite images show? Why is this information important? •How do we get satellite images? How do satellites travel? •What can meteorologists learn by the shade of the clouds on a satellite image?
- 11. Weather Maps Radar Image Maps •What does radar show? •How do you use the map key on a radar map? •How do we get radar images? •What are some of the limitations of radar maps?
- 12. Weather Maps Precipitation Maps •What is precipitation? •What are some examples of precipitation? •Define the different types of precipitation on the map. •What causes different types of precipitation?
- 13. Weather Maps Temperature Maps •What is temperature? (For the clearest definition, see the “Weather terms” chart in the background article.) •What are the two most important factors in temperature? •Why is it usually cooler at night? •Why does temperature change during the seasons?
- 14. Weather Maps Wind Speed Maps •Explain the main cause of winds. •Why are some winds stronger than others? •How does wind affect the weather? •How are winds named?
- 15. Bars/Lines/Circles Showing Pressure are Called Isobars
- 16. Bars/Lines/Circles Showing Pressure are Called Isobars When Isobars are far apart When Isobars are Gentile Wind close together Fast Wind And Gusts
- 17. 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.
- 18. 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?
- 19. Discussion Questions • Describe other maps you’ve seen in weather reports (examples: UV index, snowfall, pollen count). • Why are these maps important?