Air Masses and Fronts Science 6th Grade.

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Presentation transcript:

Air Masses and Fronts Science 6th Grade

Air Mass A large body of air with similar temperature, humidity, and air pressure. Air masses form over large land or water masses. MAP TAP 2002-2003 Weather Fronts

Tropical – warm air masses that form over the tropics. Whether an air mass is warm or cold depends on the temperature over which the mass forms. 4 types of air masses Tropical – warm air masses that form over the tropics. Polar – cold air masses that form over the poles. Maritime – air masses that form over the ocean (very humid) Continental – form over land – (are dry) MAP TAP 2002-2003 Weather Fronts

Continental - Means land. A Continental air mass forms over land. Weather Fronts

Maritime - Means water. Maritime air masses form over water. MAP TAP 2002-2003 Weather Fronts

Polar Polar means it forms over the poles. COLD! MAP TAP 2002-2003 Weather Fronts

Tropical Form over the tropics (near the equator) WARM!! MAP TAP 2002-2003 Weather Fronts

MAP TAP 2002-2003 Weather Fronts

Fronts A front is a place where two different air masses meet Three main types A “battle” between air masses Maritime Tropical Continental Polar FRONT

Fronts Where air masses meet but do not mix due to different temperatures and densities. becomes a front MAP TAP 2002-2003 Weather Fronts

Cold Fronts Click for Animation

Cold Front A cold air mass is replacing a warmer air mass. Shown on a weather map by a blue line with triangles pointing the direction the cool air is moving.

Cold Front Moves quickly and can produce thunderstorms After it moves through, skies will be clear and temperatures will be cooler

Cold Front Rapidly moving cold air mass runs into a slowly moving warm air mass. The denser cold air slides under the lighter warm air pushing it upward. The rising air cools and condenses, forming clouds. Heavy rain or snow may fall. If the warm air mass contains only a little water vapor, there may be only cloudy skies. MAP TAP 2002-2003 Weather Fronts

Air gets drier after a cold front moves through Fronts: Five Types of Fronts 1. Cold Front: The zone where cold air is replacing warmer air Air gets drier after a cold front moves through NSF North Mississippi GK-8

Cold Front Reflect Explain the types of weather associated with a cold front. A cold front passed through last night. Predict what the weather is like now? Create a simile: A cold front is like a _______________________. Explain.

Warm Front Click for Animation

Warm Front Warm air mass collides with a slowly moving cooler air mass. Shown on a weather map by a red line with half circles pointing the direction the warm air is moving. MAP TAP 2002-2003 Weather Fronts

Warm Front Moves slower than cold fronts Brings humid weather and sometimes rains for days After it moves through, temperatures are warmer

Warm Front Moving warm air mass collides with a slowly moving cold air mass. The warm air moves over the denser cold air. If the warm air is humid, showers and light rain fall along the front where the warm and cold air meet. If the warm air is dry scattered clouds form. MAP TAP 2002-2003 Weather Fronts

Air gets more humid after a warm front moves through Fronts: Types of Fronts 2. Warm Front: The zone where warm air is replacing colder air Air gets more humid after a warm front moves through NSF North Mississippi GK-8

Warm Front Because warm fronts move more slowly than cold fronts, the weather may be rainy or foggy for several days. After the warm front passes, the weather is likely to be warm and humid. In winter, warm fronts bring snow. MAP TAP 2002-2003 Weather Fronts

Warm Front Reflect Restate the cause of a warm front. Which type of front do you feel is the best and why? Compare and contrast warm fronts and cold fronts. What would it be like to be a warm front?

Comparing Warm and Cold Fronts Cold fronts move faster than warm fronts. The weather activity in a cold front is often violent and happens directly at the front. Cold fronts have sudden gusty winds high in the air creating turbulence. The weather activity in a warm front generally happens before the front passes. In a warm front the cloud formation is very low often creating situations of poor visibility. MAP TAP 2002-2003 Weather Fronts

Locate the types of fronts on this weather map.

Cold Fronts

Warm Front

Be a Weather Forecaster 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. Weather Fronts

Be a Weather Forecaster There is a cold front approaching. The temperatures will probably be cooler behind the front.

Be a Weather Forecaster Of course, meteorologists (weather forecasters) use much more data than fronts and air masses to help them forecast the weather more accurately. But any forecast is just a prediction of what might happen. Even with the best data, weather forecasts can be wrong. MAP TAP 2002-2003 Weather Fronts