1. High and Low Pressure Systems Eric Angat Environmental Science

2. Essential Question How does the density of the wind affect wind direction, air masses, and fronts?

3. 1. What are the Global Winds? Polar Easterlies Trade winds (near the equator) Polar Easterlies Westerlies Trade winds Westerlies

4. 2. Locate the following air pressures among the isobars. ( 982, 986, 990 ) 982 986 990 The contour interval is _____. 4

5. 3. Locate the following air pressures among the isobars. ( 982, 986, 990 ) 990 986 982 The contour interval is _____. 4

6. High Pressure Centers also known as anticyclones and Low Pressures Centers are called cyclones. 4. What are cyclones and anticyclones?

7. 5. What kind of weather front is found in the cyclone? Southern Hemisphere Cold Front

8. wind blows from areas of high pressure, towards areas of lower pressure. 6. What direction does wind blow? High Pressure Low Pressure

9. Cold air mass Warm air mass (Low Pressure) Cold air mass (High Pressure)

10. Jet Stream are generally westerly winds in a relatively narrow stream in the upper troposphere. http://www.stormsurfing.com/cgi/display_alt.cgi?a=glob_250 Remember: Winds are described where they are coming from. 7. What are Jet streams?

11. Cold air mass Warm air mass (Low Pressure) Cold air mass (High Pressure)

12. West Jet streams

13. 8. Do planes fly in the Jet stream ? Yes, the jet stream is now used to save planes time when traveling with it if the jet stream is going against the plane they avoid it as it would slow the plane down. http://doowansnewsandevents.wordpress.com/2013/05/09/t he-year-without-summer/ West

14. 9. What has most likely occurred in this area? A. A warm front has passed. B. A cold front has passed. C. A blizzard has taken place. D. A high-pressure system has stalled. Weather Conditions for City X Day and TimeTuesday at 8:00 a.m.Tuesday at 2:00 p.m. Temperature60°F40°F Pressure30.28 in.29.97 in. WindsSouthwestNorthwest SkiesPartly CloudyCloudy; Rain and Thunder