Weather Weathering the Weather Whether the weather be fine Or whether the weather be not Whether the weather be cold Or whether the weather be hot We’ll.
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Presentation on theme: "Weather Weathering the Weather Whether the weather be fine Or whether the weather be not Whether the weather be cold Or whether the weather be hot We’ll."— Presentation transcript:
Weather Weathering the Weather Whether the weather be fine Or whether the weather be not Whether the weather be cold Or whether the weather be hot We’ll weather the weather Whatever the weather Whether we like it or not
What is weather? Weather is the state of the atmosphere at a specific place and time. It is what is happening outside right now. A few miles or a few minutes can change the weather. At any given time, the weather is fair in some places, while it rains or snows in others
Why is weather important? The weather affects our lives every day. It can have an impact on what type of clothing we wear and how we spend our free time. Weather also affects agriculture, transportation, and industry.
Temperature Humidity Cloud Formation Air Pressure Wind Direction & Speed What factors affect weather?
Temperature The sun warms the earth’s surface and therefore all the air above the surface Temperature - measure of how hot or cold the air is.
Remember, temperature is the average motion (kinetic energy) of molecules, so… –high movement of molecules = high temperature (hot) –low movement of molecules = low temperature (cold)
Humidity Humidity – the amount of water vapor in the air Would you go to the beach on a hot, humid day, or a cool, crisp day?
– Absolute humidity – measure of how much water vapor the air is capable of holding. The hotter the air is, the more moisture it can hold – Relative humidity – measure of how much moisture there is actually in the air – expressed as percentage of absolute humidity
Cloud Formation With cold air, molecules move slower so droplets of water can start to stick together and form clouds - condensation Clouds form when water vapor condenses on dust particles in the air
Types of Clouds Cumulus –White, tall and puffy –Definite base, and look like cotton balls Stratus –flat shapes –stack up in layers –low level and cover most of the sky
Cirrus –Thin curves with no clear shape found high in the sky –wispy, feathery clouds –made of ice crystals Cumulonimbus –tall, puffy, and gray –may bring thunder and lightning. There are many more types of clouds. Basic categories are used to classify them. Their names combined to form over 10 different cloud types.
Air Pressure Air pressure is the weight of the air pushing down High pressure – cool air descends toward the Earth’s surface. –Usually means clear sunny days Low pressure – warm air rises upward into the atmosphere –Usually means high humidity, clouds, rain
Looking at a weather map, you’ll notice the air masses constantly moving around. The boundaries of these areas are called fronts
Wind Air moves from areas where air pressure is relatively high to areas where air pressure is relatively low. This movement of air is what we call wind. Winds are measured by direction and speed A wind chill is the cooling in temperatures that the wind causes