Presentation on theme: "Essential Questions How do global patterns of atmospheric movement influence local weather? How are weather maps used to identify global patterns of atmospheric."— Presentation transcript:
Essential Questions How do global patterns of atmospheric movement influence local weather? How are weather maps used to identify global patterns of atmospheric movement? What is the role of oceans in the formation of weather systems? TEKS 8.10 B Identify how global patterns of atmospheric movement influence local weather using weather maps that show high and low pressures and fronts C Identify the role of the oceans in the formation of weather systems such as hurricanes.
What do you know about weather and climate? Fill out the before section of this comparison chart. How is weather different from climate or are they the same thing? BEFOREAFTER WEATHERCLIMATEWEATHERCLIMATE
Climate Weather 1. The meteorological conditions, including temperature, precipitation, and wind, that characteristically prevail in a particular region. 2. A region of the earth having particular meteorological conditions: lives in a cold climate. 1. The happenings in the atmosphere at a certain time.
But what causes our weather to change ? Climate is how the weather usually is in a particular area. For example, Austin is usually very hot in the summer, and we have mild winters. Weather is what it is like outside right now. For example, a cold front came in this morning, and now I want to stay inside.
Our weather depends a lot on the wind. Wind is simply the movement of air, but what causes it and how does have such an impact on our weather?
Everyone stand very close together. Imagine all of the students in every class in the school were tightly packed into their classroom with standing room only. All doors and windows were closed. This room then would be a high pressure area. Now imagine that there is no one in the hall outside the classroom. It is totally empty. The hall then is a low pressure area. Someone opens the door… Where would you want to go? Discuss different senerios (e.g. what if there were people in the hall, how would that change your movement?)
In your journal, revise your warm-up. Are climate and weather the same thing? Next write a paragraph about the information you gained today and your experiences in a high pressure system. Be specific. What did you learn? What new questions do you have about the weather?
Your teacher has given you a post-it. Look back in your notebook to todays lesson. Write either something you learned or a question you have on the post-it. Stick your post-it to the chart your teacher has prepared for your class.
Think back on what you learned in our last class, in your interactive notebook answer the following question: 1. How do you think the movement of air in our atmosphere affects what the weather is like here and around the world? Explain your answer. 2. If you think that air moving does not affect weather around the world, explain why.
The happenings in the atmosphere at a certain time.
It means, that wind is produced by the uneven heating of the earths surface by the sun (remember, the Earth is tilted, so we dont all get the same amount of sun) Since the earths surface is made of both land and water formations, it absorbs the suns radiation unevenly. This means it does not all heat the same way.
Warm air, which weighs less than cold air, rises. Then cool air moves in and replaces the rising warm air. Warm air is LESS DENSE than cold air. This movement of air is what makes the wind blow. It is called a convection current.
In a high atmospheric pressure system the atmospheric pressure of the air is higher than that of the air around it. (Its less dense) High atmospheric pressure systems are marked by an H on a weather map They mean clear weather.
In a low atmospheric pressure system the atmospheric pressure of the air is lower than the air around it. The air is more dense. Low atmospheric pressure systems are symbolized by an L on a weather map. They mean storminess and precipitation
A place where two air masses of different temperatures meet.
The jet stream is a fast flowing, river of air. They form at the boundaries of connecting air masses that have big differences in temperature, such as of the polar region (VERY COLD AIR) and the warmer air to the south (VERY HOT AIR). Because of the Earth's rotation the streams flow west to east.
[ORIGIN from Greek anemos wind][ORIGIN from Greek baros weight]
A map that shows weather conditions
This is the large scale movement of air throughout the atmosphere. This movement, by air currents, is how heat is distributed all over our planet.
A global pattern is something that affects the entire world. It is a pattern that is seen throughout the world. Weather patterns are examples of global patterns. Climate has global patterns. These are systems that are important because they affect our entire planet.
Easterlies Trade Winds Westerlies Doldrums
Trade Winds Westerlies Easterlies Doldrums
Remember: The H stands for a High Pressure system This means CLEAR WEATHER The L stands for LOW pressure system This means STORMY weather
Large areas (blobs) of air that have the same weather, temperatures and humidity Weather changes occur with changes in air masses
Fronts are the boundary between two air masses They bring changes in the weather (from west to east) behind Fronts are named for the air that is behind them
dense Cold dense air pushes warm air out of the way Cold fronts move very quickly and bring short periods of rain/thunderstorms behind Lower temperatures are behind the front SYMBOL – the direction of the arrows points towards the direction the front is MOVING
displaces Warm air moves up the cold front as it slowly displaces the cold air Warm fronts move slowly, and bring many days of steady precipitation Higher temperatures are behind the front SYMBOL – direction of half-moons is the direction the front is moving
The air from the warm front and cold front meet, but do not move These fronts have the same weather as warm fronts SYMBOL – warm and cold fronts are moving in opposite directions, thus making a stationary condition