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Unit 3B
Weather Map Terms
| Term | Definition |
|---|---|
| weather | the day-to-day state of the atmosphere in a certain place |
| atmospheric movement | global air circulation; air is held to Earth by gravity; pushed by convection |
| air pressure | the force exerted by the atmosphere pushing on Earth’s surface |
| barometer | an instrument that measures the amount of atmospheric pressure |
| humidity | amount of water vapor (or moisture) in air |
| air masses | large bodies of air that have specific characteristics of pressure, temperature, and humidity |
| high pressure air mass | an air mass with greater atmospheric pressure than the surrounding air |
| low pressure air mass | an air mass with less atmospheric pressure than the surrounding air |
| warm front | the boundary when a warm, moist air mass overtakes a cool, dense, and dryer air mass (red semicircles on map) |
| cold front | the boundary when a cold, dryer air mass overtakes a warmer, humid air mass (blue points on map) |
| stationary front | the boundary between a cold and warm air mass, but neither one is displacing the other (alternating red and blue on the map) |
| occluded front | the boundary where a cold front caught up to and trapped a warm front (purple on map) |
| wind | any movement of air from higher pressure and density to lower pressure and density |
| high pressure | creates clear skies |
| low pressure | clouds and precipitation are likely |
| thermal energy | a form of energy that is the total kinetic energy (motion) of atoms and molecules in matter. |
| convection | transfer of thermal energy through circular motion caused by heating and cooling in fluids |
| fluid | any substance that can flow, which includes gases |
| conduction | transfer of thermal energy that requires contact between the atoms or molecules |
| gyre | a large system (swirl) of rotating ocean currents |
| cyclone | a large-scale circulation of winds around a central low pressure |
| global conveyor belt | a constantly moving system of deep-ocean currents, driven by temperature and salinity differences |
| typhoon | the term for a hurricane in the northern Pacific Ocean, it starts as a tropical cyclone |
| hurricane | the term for a tropical cyclone that has reached sustained winds of 74 miles per hour |
| weather map | shows the weather conditions at a specific time over a specific region |
| climate | weather averaged over a long period of time, like 100 years or more |
Created by:
PRO Teacher
LMS 8 Sci
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