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Weather
Unit 8
| Term | Definition |
|---|---|
| Weather | the condition of the atmosphere at a certain time and place |
| Climate | the average weather condition in an area over a long period of time determined by two factors—temperature and precipitation |
| Humidity | the amount of water vapor in the air |
| Condensation | the process by which a gas, such as water vapor, becomes a liquid |
| Dew Point | the temperature at which a gas condenses into a liquid; at its dew point, air is saturated |
| Cloud | a collection of millions of tiny water droplets or ice crystals |
| Cumulus Clouds | white, puffy fair weather clouds |
| Stratus Clouds | low level layered clouds that cover the sky |
| Cirrus Clouds | high level feathery clouds made of ice crystals |
| Precipitation | water, in solid or liquid form, that falls from the air to Earth; there are four major forms of precipitation—rain, snow, sleet, and hail |
| Air Mass | large body of air where temperature and moisture content are similar throughout |
| Continental Polar (cP) | air mass that is dry and cold (from Canada) |
| Maritime Polar (mP) | air mass that is wet and cool (i.e. North Pacific Ocean) |
| Continental Tropical (cT) | air mass that is dry and hot (i.e. desert southwest) |
| Maritime Tropical (mT) | air mass that is wet and warm (i.e. Gulf of Mexico) |
| Front | the area in which two types of air masses meet |
| Low Pressure Cyclone | pressure that usually brings wet or stormy weather |
| High Pressure Anticyclone | pressure that usually bring dry, clear weather |
| Thunderstorm | small, intense weather systems that produce strong winds, heavy rain, lightning, and thunder |
| Tornado | a small, spinning column of air that has high wind speeds and low central pressure and that touches the ground |
| Hurricane | large, rotating tropical weather system that has wind speeds of at least 120 km/h; form over warm tropical ocean water |
| Storm Surge | a wall of water that builds up over the ocean because of the strong winds and low atmospheric pressure from a hurricane |
| Weather Forecast | a prediction of weather conditions over the next 3 to 5 days |
| Thermometer | a tool used to measure air temperature |
| Meteorologist | person who observes and collects data on atmospheric conditions to make weather predictions |
| Barometer | an instrument used to measure air pressure |
| Anemometer | instrument used to measure wind speed |
| Isobars | lines that connect points of equal air pressure |
Created by:
jeffsingleton
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