winds chapter 16 section 3 pages 536-544 chapter 16 section 3 pages 536-544
TRANSCRIPT
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WindsWindsChapter 16 Section 3
Pages 536-544
Chapter 16 Section 3
Pages 536-544
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What is Wind?
• Wind- The horizontal movement of air from an area of high pressure to an area of lower pressure.
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What causes winds?:
• Winds are caused by differences in air pressure.
• The pressure differences are caused by unequal heating of the Earth’s atmosphere.
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• More Dense air sinks– (Air Has High
Pressure)
• Less Dense air rises- – (Air Has Low
Pressure)
What causes winds?:
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How is wind measured?
• Weather Vane- an instrument used to determine the direction of the wind.
• Anemometer- An instrument used to measure wind speed.
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Anemometer
• Cups blow in the wind and measure the speed of the wind.
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Weather Vane
• Tells the direction the wind is blowing from.
• If it is pointing to the south- wind is blowing from the south to the north.
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Wind Chill
• Wind Chill Factor- Wind blows over your body and removes body heat away from your body.– The stronger the wind, the more heat
removed, the colder you feel.
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• What happens to the temperature as wind speed increases?
• What is the wind chill if the temp is 5˚C and the wind is blowing at 25mph?
Wind Chill
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Local Winds
• Are winds that blow over short distances.
• Caused by unequal heating of Earth’s surface with in a small area.– Land heats faster than water.– Water cools slower than land.
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• Sea Breeze- The flow of air from a body of water to land.– Land is warmer – less dense air rises.– Water is cooler- more dense air sinks.
Local Winds
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• Land Breeze- The flow of air from land to a body of water. – Water is warmer – less dense air rises.– Land is cooler- more dense air sinks.
Local Winds
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• A large sea and land breeze over a large region that changes direction with the seasons.– Winds blow steadily from the land to the
ocean, or the ocean to the land depending on the season.
Monsoons
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Monsoons (Summer)• The land is warmer
than the water.• Less dense air rises
• The water is cooler than the land.• More dense air sinks
• Wind blows from the water to the land.• Carries water vapor,
making the air humid which causes heavy rain.
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Monsoons (Winter)
• The water is warmer than the land.• Less dense air rises
• The land is cooler than the water.• More dense air sinks
• Wind blows from the land to the water.• Causes a dry
season in India.
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Reading Wind Maps
Cloud Cover
• The line points into the weather station from the direction the wind came from.• This example shows that the wind is
coming from the east.
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Reading Wind Maps
Cloud Cover
• To determine wind speed. Read the flag on the end of the wind direction line.• Use the chart to determine the wind
speeds in knots and mph.• Example above: 8-12 knots (9-14mph)