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Weather Study

TermDefinition
Occluded Front Usually a sign that the parent weather system has reached its mature stage and is decaying (decreasing in intensity).
Stationary Front Warm air is behind it (to its south) with cool air ahead of it (to its north).
Cold Front When the cold air mass takes over the warm air mass, causing it to go up into the atmosphere.
Warm Front When a warm air mass takes over a cold air mass, leaving warm air.
Sea Breeze Breezes (or slow, gentle winds) that we feel during the daytime when we are near the sea or ocean, or any really large body of water.
Land Breeze A local wind system characterized by a flow from land to water late at night.
Air Mass A large body of air with roughly the same temperature and humidity.
Jet Stream A band of fast-moving wind that is high up in the atmosphere.
Wind The movement of air near Earth's surface.
Air Pressure The weight of air molecules pressing down on the Earth.
Low Pressure When warm air rises up to make clouds and rain.
High Pressure Air molecules are held down resulting in clear, sunny days.
Weather The way the air and the atmosphere feels.
Climate The weather found in a certain place over a long period of time.
Gulf Stream A huge, warm ocean current, or large body of water moving in a certain direction together that runs from the Gulf of Mexico and up along the eastern coast of the United States.
Coriolis Effect The apparent acceleration of a moving body on or near the Earth as a result of the Earth's rotation.
Prevailing Westerlies Winds in the middle latitudes between 35 and 65 degrees latitude.
Cumulonimbus Clouds Large, tall clouds that are dark on the bottom and usually produce rain and thunderstorms.
Nimbo/Nimbus Rain, precipitation.
Nimbo Stratus Low-hanging, dark gray clouds that block the sun completely.
Cirrus Cloud Composed of ice and are thin, wispy clouds blown in high winds into long streamers.
Cumulus Cloud Puffy clouds that look like puffs of cotton. Cumulus clouds that do not get very tall are indicators of fair weather. If they do grow tall, they can turn into thunderstorms.
Stratus Cloud flat clouds that form in low altitudes. Gray, drizzly days with not much sunshine.
Fog Tiny water drops hovering in the air.
Water Vapor Water in a gaseous form especially when below boiling temperature and spread through the atmosphere.
Humidity The amount of water vapor in the air.
Global Winds Global winds are created by both the spin of the Earth (Coriolis effect) and the differences in temperature between the equator and the polar areas.
El Nino Above-average sea-surface temperatures that periodically develop across the east-central equatorial Pacific.
La Nina The periodic cooling of ocean surface temperatures in the central and east-central equatorial Pacific.
Hurricane A storm with a violent wind, in particular a tropical cyclone in the Caribbean.
Barometer Mainly measures atmospheric pressure and sometimes it predicts weather changes.
Anemometer An instrument that measures wind speed.
Hygrometer Measures the humidity
Rain Gauge Determines the amount of rain that falls in particular areas.
Thermometer Measures temperature.
Weather Vane One of the earliest invented meteorological tools used to show the direction of the wind.
Created by: Hatkins
Popular Earth Science sets

 

 



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