| A | B |
|---|
| air mass | large body of air/similar in temp., humidity, and air pressure |
| air pressure | the force of air on a surface |
| cold front | an advancing mass of cold air and warm air |
| high-pressure system | atmospheric pressure is higher than in the surrounding areas |
| knot | a unit of speed equal to 1.852 kilometers per hour |
| low-pressure system | atmospheric pressure is lower than in surrounding areas |
| Precipitation | water that falls to Earth's surface |
| Warm front | an advancing mass of warm air and a mass of colder air |
| sleet, snow, hail, mist | types of precipitation |
| cyclones | found in low pressure systems |
| moist air and cloudy conditions | associated with low-pressure |
| dry air and sunny weather | associated with high pressure system |
| anticyclones | found in high pressure systems |
| overcast skys and gentle showers | associated with warm fronts |
| warm front on a weather map | indicated by row of semicircles |
| cold front on a weather map | indicated by a row of triangles |
| gusty winds, rain, thunderstorms | associated with cold fronts |
| When cold air moves below warm air and pushes it up | occurs during a cold front |
| air pressure avg 1,013 hectopascals | at sea level |
| hectopascals (hPa) | how air pressure is measured |
| can measure hundreds or thousands of miles across | large air masses |
