5. = TROPICAL = POLAR = MARITIME (means sea… wet) = CONTINENTAL (means land… dry)

8. Prevailing Westerlies JET STREAM Prevailing Westerlies That’s why weather generally moves WEST to EAST in the U.S.

9. Air masses are steered by the jet stream.

12. Less dense Rises Denser sinks

13. Cold Fronts and Warm Fronts

14. Denser sinks Less dense rises

15. Cold Fronts and Warm Fronts

16. Less dense Rises Denser sinks

17. Denser Less dense

18. FrontHow it FormsType of Weather A fast-moving cold air mass overtakes a warm air mass. Clouds form. If warm air is humid, rain/snow may fall. Possible thunderstorms. A warm air mass overtakes a slow-moving cold air mass. Scattered clouds. Light rain or snow. May last several days. Cold and warm air meet, but neither can move the other. Creates “standoff” Rain, snow, clouds, or fog that may last for days. A warm air mass is caught between 2 cooler air masses. Warm air mass is pushed up. Temperature gets cooler. Clouds and rain may form. Compare/Contrast Chart - Types of Fronts Cold Warm Occluded Stationary

19. COLD FRONTWARM FRONT STATIONARY FRONT OCCLUDED FRONT