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Similar to Weather Fronts, Pressure Centers And Storms
Similar to Weather Fronts, Pressure Centers And Storms (20)
Weather Fronts, Pressure Centers And Storms
- 2. Because Earth is not heated evenly, our atmosphere forms large masses. These masses can be warm, cold, moist or dry.
- 3. These air masses move over Earth’s surface. The masses can collide (bump into each other).
- 4. The edges of these air masses are called fronts. When fronts move toward each other they can cause changes in the weather.
- 5. We know that warm air is less dense (not as heavy) as cold air. Warmer air rises. Cold air is denser (heavier) than warm air. Cooler air sinks .
- 6. So when a cold air mass collides with a warm air mass, the warm moist air is pushed up by the heavier cold air.
- 7. It’s cold way up there. When the water vapor in the air cools it condenses . It can also cause precipitation (rain or snow).
- 9. On a weather map, a cold front looks like a blue line with teeth that point in the direction the front is moving.
- 10. Here is a large cold front that is moving south and east across the United States.
- 11. When a warm air mass moves into a cold air mass it’s called a warm front.
- 12. On a weather map, a warm front looks like a red line with bumps pointing in the direction the warm front is moving.
- 13. Here is a warm front moving north into Canada.
- 19. H stands for a high pressure area. L stands for a low pressure area.
- 20. High pressure usually means nice weather, clear skies, and no precipitation. Remember: On a weather map “ H” means “happy” weather.
- 21. Low pressure usually means bad weather, cloudy skies, and possible precipitation. Remember: On a weather map “ L” means “lousy” weather.
- 22. This map show the position of a cold front as it moves across the country.
- 23. This map show the position of a cold front as it moves across the country. Day 1
- 24. This map show the position of a cold front as it moves across the country. Day 1 Day 2
- 25. This map show the position of a cold front as it moves across the country. Day 1 Day 2 Day 3
- 33. The are called funnel clouds because they are always shaped like a funnel.
- 34. When a funnel cloud touches the ground it is called a tornado.
- 35. Tornados can stay on the ground for a few second but rarely longer than a few minutes.
- 39. Hurricanes are a much larger type of storm. They always form over warm tropical oceans.
- 42. But when it first makes landfall it can be a disaster .
- 74. When a cold front collides with a warm front the warm moist is pushing upwards.