| A | B |
| PRESSURE GRADIENT | difference between high & low pressure (winds) |
| CYCLONE | another name for a low pressure center |
| DEW POINT TEMP. | temperature when air becomes saturated |
| PRECIPITATION | anything that falls from the sky |
| FRONT | boundary between air masses |
| JET STREAMS | high speed winds in upper atmosphere |
| BAROMETER | instrument that measures air pressure |
| ANEMOMETER | instrument that measures wind speed |
| RELATIVE HUMIDITY | comparison of how much water vapor the air is holding to what it could hold |
| SLING PSYCHROMETER | a dry bulb & wet bulb thermometer swung around together |