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Fronts

Fronts. Caroline, El, and Sarah. Warm Fronts. A warm front is the boundary between warm air and cool air as warm air replaces cool air. A warm front brings widespread precipitation. It brings days of bad weather: rain, snow, sleet, or freezing rain, often at the same time.

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Fronts

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  1. Fronts Caroline, El, and Sarah

  2. Warm Fronts • A warm front is the boundary between warm air and cool air as warm air replaces cool air. • A warm front brings widespread precipitation. • It brings days of bad weather: rain, snow, sleet, or freezing rain, often at the same time. • The air behind a warm front is more moist and warm than the air ahead of it. • Warm fronts move from southwest to northeast.

  3. Cold Fronts • When a cold air mass replaces a warm air mass it creates a cold front. • Most of the time cold fronts move faster than any other front. • Cold fronts usually are easier to find on a weather map than any other front. • Cooler weather, clearing skies, and sharp change in one direction are usually caused by a cold front. • Sometimes a good indicator that a cold front is near is that there is an abrupt change in temperature.

  4. Stationary Fronts • Stationary fronts are the boundaries between air masses that have stopped advancing. • Stationary fronts often bring days of cloudy , wet weather. • The boundary can be thousands of feet above the ground or a couple of miles away from the surface front. • Clouds and precipitation will form as warm air runs over cool air along a stationary front if there is enough humidity in the air.

  5. Occluded Fronts • Occluded fronts involve 3 air masses of different temperatures: cold air, cool air, and warmer air. • Occluded fronts can form when a cold air mass goes toward colder air with warmer air between the two. • The cool air forces the warmer air up, closing off the warm air from the surface.

  6. Conclusion • Weather fronts are the boundaries between warm and cool air. The masses of air have different densities and are usually caused by temperature differences. • When warm and cold air stop moving, it causes a stationary front. • When a warm front catches a cold front, it produces an occluded front. • When cold air replaces warm air in a transition zone, it makes a cold front. • When warm air replaces cold air, it makes a warm front.

  7. Bibliography • www.wikipedia.com • www.usatoday.com • Alabama Science Book • http://ww2010.atmos.uiuc.edu

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