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Air Masses and Fronts. Mrs. Wharton’s Science Class. Air MAss. Huge body of air that has similar temperature, humidity and air pressure Scientists classify air masses by TEMPERATURE AND HUMIDITY. Tropical v Polar. Tropical ( warm) air masses- form in the tropics and have LOW air pressure .

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Air masses and fronts

Air Masses and Fronts

Mrs. Wharton’s Science Class


Air mass
Air MAss

  • Huge body of air that has similar temperature, humidity and air pressure

  • Scientists classify air masses by TEMPERATURE AND HUMIDITY


Tropical v polar
Tropical v Polar

  • Tropical ( warm) air masses- form in the tropics and have LOW air pressure.

  • Polar (cold) air masses- form north of 50 degrees north latitude, and south of 50 degrees south latitude. Have HIGH air pressure.


Maritime v continental
Maritime V Continental

  • Maritime- air masses that occur over water. Are HUMID.

  • Continental- air masses that occur over land. Are DRY.


Front
Front

  • When air masses meet, and do not mix a front is formed.

  • When air masses meet at a front, the collision causes storms and changeable weather.


Cold front
Cold Front

  • Moves quickly under a warm front.

  • Brings cold, dry air.


Warm front
Warm front

  • When warm air moves over cold air

  • Move slowly and bring warm, humid air.


Stationary front
Stationary front

  • Forms when cold and warm air masses meet but neither one has enough force to move the other.

  • It may bring many days of clouds and precipitation.


Occluded front
Occluded front

  • Forms when a warm air mass is caught between two cooler air masses.

  • Warm air is cut off from the ground.

  • May cause clouds and precipitation.


Cyclone
Cyclone

  • A swirling center of low pressure

  • CYCLONES AND DECREASING AIR PRESSURE ARE ASSOCIATED WITH STORMS AND PRECIPITATION.

  • Anticyclone- are HIGH pressure centers of dry air.


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