Chapter 16- Weather
About this set
Created by:
Paulina21700 on April 15, 2012
Subjects:
Description:
Earth Science
Glencoe
McGraw Hill
Grade 6
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22 terms
Terms | Definitions |
|---|---|
 weather | the condition of Earth's atmosphere at a particular time and place |
| air | made up of molecules that are moving randomly, even when there's no wind. |
| wind vane | measures wind direction; has an arrow that points in the direction from which the wind is blowing |
| wind stock | a weather instrument measures wind speed; has one open end that catches the wind, causing the stock to point in the direction towards which the wind is blowing. |
| anemometers | measures windspeed; have rotating cups that spin faster when the wind is strong |
| humidity | the amount of water vapor in the air |
| relative humidity | a measure of the amount of water vapor present in the air compared to the amount needed for saturation at a specific temperature |
| dew point | the temperature at which the water vapor in the air becomes saturated and condensation begins |
| clouds | form when moist air is lifted and cools. This occurs where air is heated, and where cold air meets warm air. |
| fog | A stratus cloud that forms when air is cooled to its dew point near the ground. |
| precipitation | water that falls to Earth's surface as rain, snow, sleet, or hail |
| air mass | large body of air that has the same properties similar to the part of earth's surface over which it developes |
| front | a boundry between two air masses of different density, moisture, or tempurature |
| cold front | occurs when colder air advances toward warm air |
| warm front | occurs when lighter, warmer air advances over hevier, colder air |
| occluded front | a front where a warm air mass is caught between two colder air masses and brings cool temperatures and large amounts of rain and snow. |
| hurricane | a large, swirling, lowpressure, powerful windstorm that forms over warm ocean waters |
| blizzard | winter storm that lasts least 3 hours with temperture of -12C or below poor visibilty and wind at least 51 km/h |
| meteorologist | a person who studies the weather |
| station model | shows the weather conditions at a specific location on Earth's surface using symbols |
| isotherm | line drawn on a weather map that connects points having equal temperature |
| isobar | a line drawn to connect points of equal atmospheric pressure |
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