Science - Weather

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Air Pressure

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The weight of the air pushing down on Earth's surface; influenced by air temperature.

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Front

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Boundary between air masses of DIFFERENT termperatures and humidity.

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Temperature

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Measure of the amount of thermal energy (heat energy) in the atmosphere.

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Climate

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The type of weather in a specific area over a period of time.

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Forecast

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Prediction of future weather based on data collected from measurement tools and past weather patterns.

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Meteorologist

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A scientist who studies weather

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Weather

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Is the condition of the atmosphere at a particular time and place.

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Rain

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occurs when the temperatureof the clouds and the air is above 32 degrees F

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Sleet

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occurs when rain from a warm cloud falls through freezing air.

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Hail

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occurs when tiny ice particles collect water while moving up and down within a cloud colder than 32 degrees F

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Snow

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occurs when a moist wind that is colder than 32 degrees F makes contact with a cloud

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Thunderstorms

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occur when warm humid air along a front RISES quickly and form a thundercloud, thunder and lightning

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Tornadoes

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are rapidly circling columns of air that move in a narrow path over land

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Hurricane

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a violent storm formed over a warm ocean. Wind swirls around an eye at great speeds

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Blizzard

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is a long lasting snow storm with strong wind and intense snowfall

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Thermometer

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measures the temperature of the air; measured in degrees Farenheit or degrees Celcius

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Barometer

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measures the air pressure

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Anemometer

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measures wind speed in MPH (miles per hour)

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Rain Gauge

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measures the amount of precipitation that has fallen (sow, rain,sleet, hail)

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Hygrometer

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measures the humidity in the air

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Weather Vane

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shows the direction the wind is blowing

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Evaporation

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During the water cycle, liquid water is heated and changed to a gas called water vapor.

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Transpiration

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evaporation of water from plant leaves. The water is carried through the plants from the roots to the leaves and then it changes to water vapor and is released into the air.

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Condensation

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The gas (water vapor) is cooled and changed back to a liquid. The water droplets form clouds.

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Precipitation

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When the clouds become heavy, the water as a liquid or a solid falls to the ground

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Water Cycle

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The continuous movement of water in the environment through evaporatio, condensation and precipitation.

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Atmosphere

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The blanket of air that surrounds Earth

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Cloud

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A mass of water droplets or ice crystals that have clustered in the atmosphere

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Cumulonimbus cloud

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A huge vertical cloud that can produce a thunderstorm and hail

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Fog

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A stratus cloud that forms next to the ground

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Cumulous cloud

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A puffy, white cloud with a flat bottom

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Air properties

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Air has mass, Air takes up space, Air exerts pressure

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Cirrus cloud

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A high, feathery cloud made of ice crystals

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Stratus cloud

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A flat, gray, layered cloud that covers the sky