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Teacher Page. Weather Fronts. Science 6 th Grade. Air Mass. A large body of air with similar temperature and moisture. Air masses form over large land or water masses. Frontal Boundaries. Where air masses interact – also know as a front. 4 kinds of fronts: Cold front Warm front - PowerPoint PPT Presentation
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MAP TAP 2002-2003MAP TAP 2002-2003 Weather FrontsWeather Fronts 33
Air MassAir Mass• A large body A large body
of air with of air with similar similar temperature temperature and moisture.and moisture.
• Air masses Air masses form over form over large land or large land or water water masses.masses.
MAP TAP 2002-2003MAP TAP 2002-2003 Weather FrontsWeather Fronts 44
Frontal BoundariesFrontal Boundaries
• Where air Where air masses interact – masses interact – also know as a also know as a front.front.
• 4 kinds of fronts:4 kinds of fronts:– Cold frontCold front– Warm frontWarm front– Occluded frontOccluded front– Stationary frontStationary front
Cold FrontCold Front• A cold air A cold air
mass is mass is replacing a replacing a warmer air warmer air mass.mass.
• Shown on a Shown on a weather map weather map by a blue line by a blue line with triangles with triangles pointing the pointing the direction the direction the cool air is cool air is moving.moving.
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MAP TAP 2002-2003MAP TAP 2002-2003 Weather FrontsWeather Fronts 66
Warm FrontWarm Front
• Warm air mass Warm air mass replacing a replacing a cooler air cooler air mass.mass.
• Shown on a Shown on a weather map weather map by a red line by a red line with half with half circles pointing circles pointing the direction the direction the warm air is the warm air is moving.moving.
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MAP TAP 2002-2003MAP TAP 2002-2003 Weather FrontsWeather Fronts 77
Comparing Warm and Cold Comparing Warm and Cold FrontsFronts
• Cold fronts move faster than warm fronts. Cold fronts move faster than warm fronts.
• The weather activity in a cold front is often The weather activity in a cold front is often violent and happens directly at the front.violent and happens directly at the front.
• Cold fronts have sudden gusty winds high in Cold fronts have sudden gusty winds high in
the air creating turbulence. the air creating turbulence.
• The weather activity in a warm front The weather activity in a warm front generally happens before the front passes. generally happens before the front passes.
• In a warm front the cloud formation is very In a warm front the cloud formation is very low often creating situations of poor visibility.low often creating situations of poor visibility.
MAP TAP 2002-2003MAP TAP 2002-2003 Weather FrontsWeather Fronts 88
Occluded FrontsOccluded Fronts• When a warm When a warm
front is trapped front is trapped by 2 cold fronts.by 2 cold fronts.
• Shown on a Shown on a weather map weather map by a purple line by a purple line with alternating with alternating triangles and triangles and semicircles semicircles pointing the pointing the direction the direction the front is moving.front is moving.
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MAP TAP 2002-2003MAP TAP 2002-2003
Stationary FrontsStationary Fronts• A front that stops moving or is moving very A front that stops moving or is moving very
slowly.slowly.
• Shown on a weather map with alternating red Shown on a weather map with alternating red semicircles pointing away from the warm air and semicircles pointing away from the warm air and blue triangles pointing away from the cold air.blue triangles pointing away from the cold air.
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Locate the 4 types of fronts on Locate the 4 types of fronts on this weather map.this weather map.
Hint1
Hint2
Hint3
Hint4
Weather FrontsWeather Fronts 1515
Be a Weather ForecasterBe a Weather Forecaster
You are planning to travel to Alabama in 2 days. The high temperature there for today is 68º F.
You are planning to travel to Alabama in 2 days. The high temperature there for today is 68º F.
Use the map to help you predict whether the temperature in Alabama will increase, decrease, or stay the same. Explain why you think so.
1616
Be a Weather ForecasterBe a Weather Forecaster
There is a cold front approaching. The temperatures will probably be cooler behind the front.
There is a cold front approaching. The temperatures will probably be cooler behind the front.
MAP TAP 2002-2003MAP TAP 2002-2003 Weather FrontsWeather Fronts 1717
Be a Weather ForecasterBe a Weather Forecaster
• Of course, meteorologists Of course, meteorologists (weather forecasters) use (weather forecasters) use much more data than fronts much more data than fronts and air masses to help them and air masses to help them forecast the weather more forecast the weather more accurately. But any forecast accurately. But any forecast is just a prediction of what is just a prediction of what might might happen. Even with happen. Even with the best data, weather the best data, weather forecasts can be wrong. forecasts can be wrong.