| A | B |
|---|
| Maritime Tropical | Warm, humid air masses that form over large bodies of water near the tropics |
| Continental Tropical | Hot, dry air masses that form in the summer over dry land |
| Maritime Polar | Cool, humid air masses that form over icy cold oceans |
| Continental Polar | Air masses from Canada that brings cold air to areas of the U.S. |
| Front | area where air masses meet and do not mix |
| Cold Front | Fronts that move quickly and can cause violent thunderstorms. Cool, dry clear skies follow. |
| Warm Front | Rainy or foggy conditions for several days. Weather is warm and humid after. In the winter, this front brings snow. |
| Stationary Front | Neither front has enough force to move the other. May bring many days of clouds and precipitation. |
| Occluded Front | A warm air mass is caught between 2 cooler air masses. |
| Cyclone | Swirling center of low air pressure |
| Anticyclone | High pressure centers of dry air. |
