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 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.
Occluded Fronts

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