| A | B |
|---|
| AIR MASS | A huge body of air that has similar temperature, pressure, and humidity throughout. |
| TROPICAL | A warm air mass that forms in the tropics and has low air pressure. |
| POLAR | A cold air mass that forms north of 50° north latitude or south of 50° south latitude and has high air pressure. |
| MARITIME | A humid air mass that forms over oceans. |
| CONTINENTAL | A dry air mass that forms over land. |
| FRONT | The area where air masses meet and do not mix. |
| OCCLUDED | Cut off, as the warm air mass at an occluded front is cut off from the ground by cooler air. |
| CYCLONE | A swirling center of low air pressure. |
| ANTICYCLONE | A high-pressure center of dry air. |
| STORM | A violent disturbance in the atmosphere. |
| LIGHTNING | A sudden spark, or energy discharge, caused when electrical charges jump between parts of a cloud or between a cloud and the ground. |
| TORNADO | A rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud to touch Earth's surface, usually leaving a destructive path. |
| HURRICANE | A tropical storm that has winds of 119 kilometers per hour or higher; typically about 600 kilometers across. |
| EVACUATE | To move away temporarily. |
| FLASH FLOOD | A sudden, violent flood that occurs within a few hours, or even minutes, of a heavy rainstorm. |
| METEOROLOGIST | Scientists who study the causes of weather and try to predict it. |
| ISOBAR | Lines on a map joining places that have the same air pressure. |
| ISOTHERM | Lines on a map joining places that have the same temperature. |
