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Weather and Climate DO NOT EDIT--Changes must be made through “File info” CorrectionKey=TX-A SECTION 1 Weather and TEKS 6A, 21B, 21C, 22A, 22D Climate What You Will Learn… If YOU lived there... Main Ideas You live in Buffalo, New York, at the eastern end of Lake Erie. One 1. While weather is short term, evening in January, you are watching the local TV news. The weath- climate is a region’s average er forecaster says, “A huge storm is brewing in the Midwest and weather over a long period. 2. The amount of sun at a given moving east. As usual, winds from this storm will drop several feet location is affected by Earth’s of snow on Buffalo as they blow off Lake Erie.” tilt, movement, and shape. 3. Wind and water move heat around Earth, affecting how Why will winds off the lake drop snow on Buffalo? warm or wet a place is. 4. Mountains influence tem- perature and precipitation. BUILDING BACKGROUND All life on Earth depends on the sun’s The Big Idea energy and on the cycle of water from the land to the air and back The sun, location, wind, again. In addition, sun and water work with other forces, such as water, and mountains affect wind, to create global patterns of weather and climate. weather and climate. Key Terms Understanding Weather and Climate weather, p. 50 climate, p. 50 What is it like outside right now where you live? Is it hot, sunny, prevailing winds, p. 51 wet, cold? Is this what it is usually like outside for this time of ocean currents, p. 52 year? The first two questions are about weather, the short-term front, p. 53 changes in the air for a given place and time. The last question is about climate , a region’s average weather conditions over a long period. Weather is the temperature and precipitation from hour to Use the graphic organizer online hour or day to day. “Today is sunny, but tomorrow it might rain” to take notes on the factors that is a statement about weather. Climate is the expected weather affect weather and climate. for a place based on data and experience. “Summer here is usu- ally hot and muggy” is a statement about climate. The factors that shape weather and climate include the sun, location on Earth, wind, water, and mountains. READING CHECK Finding Main Ideas How are weather and climate different from each other? 50 CHAPTER 3 DO NOT EDIT--Changes must be made through “File info” CorrectionKey=TX-A Sun and Location Global Wind Systems Energy from the sun heats the planet. Dif- Prevailing winds blow in circular belts across Earth. These belts ferent locations receive different amounts occur at about every 30° of latitude. of sunlight, though. Thus, some locations ANALYZING VISUALS Which direction do the prevailing winds are warmer than others. The differences are blow across the United States? due to Earth’s tilt, movement, and shape. NORTH POLE You have learned that Earth is tilted on 90°N its axis. The part of Earth tilted toward the Polar easterlies sun receives more solar energy than the part tilted away from the sun. As the Earth 60°N s lie revolves around the sun, the part of Earth er st that is tilted toward the sun changes dur- e W 30°N ing the year. This process creates the sea- s d n sons. In general, temperatures in summer i w e d are warmer than in winter. Tra Earth’s shape also affects the amount 0° Equator Doldrums of sunlight different locations receive. Tra de w Because Earth is a sphere, its surface is in d s rounded. Therefore, solar rays are more direct and concentrated near the equator. 30°S W e Nearer the poles, the sun’s rays are less s te rl direct and more spread out. ies As a result, areas near the equator, 60°S called the lower latitudes, are mainly hot Cool air year-round. Areas near the poles, called the Polar easterlies Warm air Wind direction higher latitudes, are cold year-round. Areas 90°S about halfway between the equator and SOUTH POLE poles have more seasonal change. In gen- eral, the farther from the equator, or the Global Winds higher the latitude, the colder the climate. Wind, or the sideways movement of air, blows in great streams around the planet. READING CHECK Summarizing How does mg7frs_winmap005a 3rdPrevailing pass winds are winds that blow in the Earth’s tilt on its axis affect climate? 5/5/5 cmurphysame direction over large areas of Earth. The diagram above shows the patterns of Earth’s prevailing winds. Wind and Water To understand Earth’s wind patterns, Heat from the sun moves across Earth’s you need to think about the weight of air. surface. The reason is that air and water Although you cannot feel it, air has weight. warmed by the sun are constantly on the This weight changes with the temperature. move. You might have seen a gust of wind Cold air is heavier than warm air. For this or a stream of water carrying dust or dirt. reason, when air cools, it gets heavier and In a similar way, wind and water carry heat sinks. When air warms, it gets lighter and from place to place. As a result, they make rises. As warm air rises, cooler air moves in different areas of Earth warmer or cooler. to take its place, creating wind. CLIMATE, ENVIRONMENT, AND RESOURCES 51 DO NOT EDIT--Changes must be made through “File info” CorrectionKey=TX-A Major Ocean Currents Warm current Arctic Ocean Cold current NORTH EUROPE AMERICA North ASIA Pacific North Ocean Atlantic Ocean AFRICA Equator SOUTH AMERICA Indian Ocean AUSTRALIA South South Pacific Atlantic Ocean Ocean Southern Ocean ANTARCTICA Movement Ocean currents carry warm 1. Use the Map Does a warm or cold ocean current water from the equator toward the poles flow along the lower west coast of North America? and cold water from the poles toward the 2. Explain How do ocean currents move heat between equator. The currents affect temperature. warmer and colder areas of Earth? mgfvs_winmap006a 2nd pass On a global scale, this rising, sink- Ocean Currents 5/5/5 ing, and flowing of air creates Earth’s Like wind, ocean currents — large streams cmurphy prevailing wind patterns. At the equator, of surface seawater—move heat around hot air rises and flows toward the poles. Earth. Winds drive these currents. The At the poles, cold air sinks and flows map above shows how Earth’s ocean cur- toward the equator. Meanwhile, Earth is rents carry warm or cool water to different rotating. Earth’s rotation causes prevail- areas. The water’s temperature affects air FOCUS ON ing winds to curve east or west rather temperature near it. Warm currents raise READING than flowing directly north or south. temperatures; cold currents lower them. What is the effect Depending on their source, prevailing The Gulf Stream is a warm current that of Earth’s rotation on prevailing winds make a region warmer or colder. In flows north along the U.S. East Coast. It winds? addition, the source of the winds can make then flows east across the Atlantic to become a region drier or wetter. Winds that form the North Atlantic Drift. As the warm cur- from warm air or pass over lots of water rent flows along northwestern Europe, it often carry moisture. In contrast, winds heats the air. Westerlies blow the warmed that form from cold air or pass over lots of air across Europe. This process makes Europe land often are dry. warmer than it otherwise would be. 52 CHAPTER 3 DO NOT EDIT--Changes must be made through “File info” CorrectionKey=TX-A Large Bodies of Water Tornadoes can be extremely deadly as well. Large bodies of water, such as an ocean or In 1925 a tornado that crossed Missouri, sea, also affect climate. Water heats and Illinois, and Indiana left 695 people dead. cools more slowly than land does. For this It is the deadliest U.S. tornado on record. reason, large bodies of water make the tem- The largest and most destructive storms, perature of the land nearby milder. Thus, however, are hurricanes. These large, rotat- coastal areas, such as the California coast, ing storms form over tropical waters in the usually do not have as wide temperature Atlantic Ocean, usually from late summer ranges as inland areas. to fall. Did you know that hurricanes and As an example, the state of Michigan typhoons are the same? Typhoons are just is largely surrounded by the Great Lakes. hurricanes that form in the Pacific Ocean. The lakes make temperatures in the state milder than other places as far north. Extreme Weather Wind, Water, and Storms Severe weather is often dangerous and destructive. In If you watch weather reports, you will hear the top photo, rescuers search for people during a flood in Yardley, Pennsylvania. Below, a tornado races across a about storms moving across the United wheat field. States. Tracking storms is important to us because the United States has so many of them. As you will see, some areas of the world have more storms than others do. Most storms occur when two air masses collide. An air mass is a large body of air. The place where two air masses of different temperatures or moisture content meet is a front. Cold air masses from the North and warm air masses from the South frequently collide over the United States, producing dramatic storms.
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