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Science Test
Weather/Water Cycle
Term | Definition |
---|---|
What is weather? | Weather is the state of the atmosphere at a place and time and is measured with temperature, wind speed/direction, precipitation, humidity, and cloud cover. It is what happens day-to-day. |
What is climate? | Climate is the weather that occurs in an area over a long period of time. |
What is a barometer? | A device that measures air pressure. Weighs the amount of air in a specific place. A falling measurement means a storm is approaching. |
What is a weather satellite? | It circles the Earth and is used to take pictures of big weather events from space. |
What is wind vane? | It shows the direction the wind is blowing. It is often times made with a rooster on top. |
What is a thermometer? | A thermometer measures the condition of the air. It measures in Celsius or Fahrenheit. Liquid expands or contracts causing it to move up and down in a tube. |
What is an anemometer? | It measures wind speed. It measures how hard the wind is blowing. Several cups catch the wind and it spins around. It measures the number of times it spins over a set period of time. |
What is a rain gauge? | It measures the amount of rain over a set period of time. Reported in inches. |
What is a hygrometer? | A device that measures humidity. It measures how much water vapor is in the air. |
Weather Path | Weather moves from west to east, about 500 miles a day. It moves faster in the winter. |
Air paths | High, cold air travels faster than low, warm air. Cold air tends to move SE and warm air tends to move E/NE |
Isobars | Lines drawn through points of equal barometric pressure. Isobars far apart mean mild winds. Isobars close mean strong winds. |
Isotherms | Bands of color showing general temperature of an area. |
Map symbols – Cold | A cold air mass is moving in the direction of the arrows. It often brings storms and cooler weather. |
Map symbols – warm | A warm air mass moving in the direction of the half circles is usually preceded by rain or snow. |
Map symbols – warm and cold | A line between two air masses when there is little or no movement means unsettled weather, often prolonged rain. |
Low pressure cells | Low pressure cells move in a counterclockwise direction. They usually forecast cloudiness and precipitation. |
High pressure cells | High pressure cells move in a clockwise direction. They usually forecast clear skies. |
Front | The line of contact between air masses of different temperatures is a front. They are fronts for the air that is behind them. When they meet a change in weather can occur. |
Weather maps | Weather maps show large masses of warm or cold moving air. |
Cold Front | Cold, dense air pushes warm air out of the way. Move quickly and bring short periods of rain and thunderstorms. The temperature decreases. |
Warm Front | Warm air move up cold front as it slowly displaces cold air. Move slowly and bring many days of steady precipitation. The temperature increases. |
Thunderstorm | Severe storm with strong winds, heavy rain and lightning |
Thunderstorm effects | Hail and heavy rain cause flooding, lightning can cause fires, strong winds can blow over power lines |
Thunderstorm safety | Stay inside, stay out of water and away from large bodies of water, don't stand under trees |
Tornado | A small funnel-shaped cloud that comes down from a storm with winds spinning at very high speeds |
Tornado effects | High winds can blow over trees and tear apart buildings. Every time a tornado touches down, it destroys everything in its path. |
Tornado safety | Find a safe place away from windows on the first floor or basement, lie flat in a ditch or other low place, do not stay in car |
Hurricane | A large storm that forms over water. They always have strong winds that blow in a circular pattern around the center (the eye) of the storm. |
Hurricane effects | High winds can blow over trees, power lines, and even buildings. Heavy rain can cause flooding. The storm waves can come in the beach and damage the coastal area. |
Hurricane safety | Board up windows of house, stay away from windows because high winds can cause them to break, move further inland if you are near the coast. |