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A Hygrometer is used to measure humidity. Windsock Slide 17 Hygrometers measure the amount of water vapor in the air. Windsocks indicate the direction that wind originates from.

Anemometer Slide 16 A windsock is used to measure wind direction. Anemometers indicate how much movement of wind is present. Barometer Slide 15 An Anemometer is used to measure wind speed. A Barometer indicates whether or not it will rain. Thermometer Slide 14 A Barometer is used to measure Atmospheric Pressure. Thermometers indicate how HOT or COLD it is outside/inside. Front Slide 12 Climate of Weather in the US Slide 13 A Thermometer is used to measure the temperature. Warm air at the surface pushes above the cool air mass, making clouds and storms. A warm front is the boundary between warm and cool (or cold) air when the warm air is replacing the cold air. Air Pressure Slide 11 A weather front is a border separating two masses of air of different densities. Your ears will pop in order to balance the pressure between the outside and inside of your ear. You can feel this change in air pressure as you go up a mountain. Air Pressure Slide 10 Its the same with air molecules those molecules on the bottom have greater pressure on them than those above. The weight or pressure on the bottom book would be much greater than the pressure on the top one. To illustrate this principle, imagine a pile of books stacked one on top of the other. Air pressure is greater near the ground than it is higher in the sky. Air Pressure Slide 9 The atmosphere of our planet is pressing down on us all the time. The force applied by an air mass is created by the molecules that make it up and their size, motion, and number present in the air. Air Masses Slide 7 Characteristics Continental forms over land which makes it dry Maritime forms over the sea which makes wet Tropical forms over warm areas which makes it warm Polar forms over cold areas which makes it cold Air Masses Slide 8 Air Pressure is the force applied on the Earth's surface by the weight of the air above the surface. Colder air masses are called Polar or Arctic. Air Masses Slide 6 Air Masses cover hundreds and thousands of square miles.

Air masses typically clash in the middle latitudes, producing some very interesting weather. Air Masses Slide 4 Slide 5 As an air mass moves away from its source region, it is modified as it encounters conditions different than those found in the source region. The best source regions for air masses are large flat areas where air can be stagnant long enough to take on the characteristics of the surface below.

Why do people in general pay little attention to the weather? Do you think this is a good idea? Why or why not? Weather Introduction Slide 3 An air mass is a large body of air with similar temperature and moisture properties throughout. What kinds of elements, things, or conditions influence the weather? Why is the study of weather important? Offer examples. Weather Unit Slide 2 How often do you watch the weather on TV? Why? What kinds of weather or weather conditions are there? Can you name situations in which weather has impacted your life or affected your plans? Explain.

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