| A | B |
|---|
| front | area where air masses meet and do not mix. |
| cyclone | a swirling center of low air pressure. |
| anticyclone | a high pressure center of dry air. |
| maritime | a humid air mass that forms over oceans. |
| polar | a cold air mass that forms north of 50 degrees north latitude or south of 50 degrees south latitude and as high pressure. |
| tropical | a warm air mass that forms in the tropics and has low air pressure. |
| air mass | a huge body of air that has similar temperature, pressure,and humidity throughout. |
| occluded | cut off |
| continental | a dry air mass that forms over land. |
| evacuate | to move away temporarily. |
| 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 Earth. |
| meteorologist | scientists who study the causes of weather and try to prdict it. |
| storm surge | a dome of water that sweeps across the coast where a hurricane lands. |
| hurricane | a tropical storm that has winds of 119 kilometers per hour or higher. |
| El Nino | an abnormal climate event that occurs every 2-7 years in the Pacific Ocean, causing changes in conditions that can lead to dramatic climate changes. |
| storm | a violent disturbance in the atmosphere. |
| 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. |
