| A | B |
|---|
| Tropical Air Mass | A warm air mass that forms in the tropics and has low air pressure. |
| Polar air Mass | A cold air mass that forms north of 50 N and S latitude and has high air pressure. |
| Maritime Air Mass | A humid air mass that forms over oceans. |
| Continental Air Mass | A dry air mass that forms over land. |
| Front | The area where air masses meet and no not mix. |
| Occluded | Cut off, as the warm air mass at an occluded fromt is cut off from the ground by cooler air beneath it. |
| Cyclone | A swirling center of low air pressure. |
| Anticyclone | A high pressure enter of dry air |
| Storm | A violent disturbance in the atmosphere |
| Lightning | A sudden spark 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 reached down froma storm cloud to touch Earth's surface, usually leaving a destructive path. |
| Hurricane | A tripical storm that has winds of 119 km per hour or higher; typically about 600 km across. |
| Storm Surge | A dome of water that sweeps across the coast where a hurricane lands. |
| Flash Flood | A sudden, violent flood that occurs within a few hours, or even minutes, of a heavy rainstorm. |
| El Nino | En event that occurs every two to seven years in the Pacific Ocean, during which winds shift and push warm surface water toward the coast of South America; it can cause dramatic climate changes. |
