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Chapters 19&20

Air Pressure, Wind, Weather Patterns, and Severe Storms

QuestionAnswer
Explain how a Barometer works. In dish, upside-down tube filled with liquid and air. When pressure rises so does the level of the liquid inside of the tube because of the pressure pushing on the liquid around it causes the liquid to travel to a place of lower pressure.
How is wind produced? Unequal heating on the Earth's surface.
Air flows from higher pressure to lower or from lower pressure to higher? From higher pressure to lower.
The greater/less the pressure difference the faster the wind speed. Greater
Isobars are: lines on a map that connect places of equal air pressure.
Closely spaced isobars mean that there is a steep/gradient pressure difference and high/low winds? Steep. High.
The Coriolis Effect describes: Earth's rotation affecting moving objects. All free moving objects in the Northern Hemisphere are deflected to the right while all free moving objects in the Southern Hemisphere are deflected to the left.
High Pressure Center: Clear Skies. Anticyclones. The values of the isobars increase from outer toward center.
Low Pressure Center: Cloudy, stormy, and windy weather. Cyclones are the center of low pressure. Pressure Declines from outer isobars toward the center.
In the US lows move from East to West or from West to East? East to West
On a summer day in a coastal region why do we get sea breezes. We get sea breezes because the land heats up faster than the water causing it to have lower pressure. The low pressure on the land causes higher pressure over water to fill in low pressure gap causing a sea breeze.
Describe breezes in Valleys and Mountains. During the day the sides of mountains heat up faster than valleys causing low pressure above sides and winds towards the sides. The opposite occurs at night because the sides cool faster.
An air mass is: A large body of air with a similar temperature and moisture content.
Air masses are classified by: The surface over which they form. Land is continental. Ocean is maritime.
A Warm Front is: When warm air moves into an area of cool air. The slope is gradual. The warm air rises then cools. Most of the time Warm Fronts produce rain. Signs of Warm Fronts are clouds.
A Cold Front is: When cold dense air moves into a region of warm air. As a cold front moves in the slope is steeper than in a warm front. Cold fronts produce heavy downpours and gusty winds. After a Cold Front the weather clears soon.
A Stationary Front is: When the flow of air on either side of front is neither cold nor warm. The surface position of the front does not move. Produces gentile to moderate precipitation.
An Occluded Front is: When a Cold Front overtakes a Warm Front.
Created by: Olga Pyatnychko Olga Pyatnychko on 2009-05-05



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