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Flashcards in Chapter 3 Deck (26):
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Four major types of air masses

Maritime tropical continental polar maritime polar continental tropical

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What air masses are commonly moved by in the US

Prevailing westerlies and jet streams

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What colliding air masses can form

Fronts

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Four types of fronts

Cold fronts warm fronts occluded fronts stationary fronts

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Warm front

A fast moving warm front overtakes a slow moving cold front, causes snow if air is warm or clouds If the air is dry (weather is warm after it passes by)

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Cold front

A rapidly moving cold front runs into a slowly moving warm front, the cold air slides under the warmer air and pushes the warm air along the leaning edge of the cold air ( can cause snow, cloudy skies, and thunderstorms) air becomes cold after it passes through

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Stationary fronts

Warm and cold air masses meet but neither can move the other, water vapor in the warm air condensed and forms water Vapor ( can bring days of rain, snow, fog, and clouds)

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Occluded fronts

A warm air mass is caught between two cold air masses, the cooler air masses move underneath the warm air and pushes it upward, the cooler air masses may mix and the temp At the ground is cooler ( clouds, rain, or snow may fall

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Maritime tropical(mT)

Over the ocean, moist, warm

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Continental tropical(cT)

Over land, dry, warm

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Maritime polar(mP)

Over ocean, moist, cold

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Continental polar(cP)

Over land, dry, cold

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Prevailing westerlies

Major wind belts over US that push air masses west/east

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Jet streams

Within prevailing westerlies and are bands of high speed winds that blow from west-east (about 10km above earths surface)

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Thunderstorms

Form in cumulonimbus clouds

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What to avoid in storms

Objects that can conduct electricity, such as metal objects, and bodies of water

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Tornadoes

Formed in thick cumulonimbus clouds

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Where to go in tornadoes

Storm shelter or basement of a well built building

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Hurricane

Begins over warm ocean water as a low pressure area or tropical disturbance

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What to do about a hurricane

Evacuate and leave the area immediately

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What most precipitation begins as

Snow

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What meteorologists use to predict weather

Maps charts computers

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What has been improved to predict weather

Technological improvements in gathering weather data and using computers

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What shows fronts areas of high and low pressure types of precipitation and temperatures

Standard symbols on weather maps

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Isobars

Lines joining places in the map that have the same pressure

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Isotherm

Lines joining places that have the same temperature