| A | B |
|---|
| air mass | A huge body of air in the troposphere with similar temperature and humidity throughout. |
| continental air mass | A low humidity air mass that originates over land. |
| maritime air mass | A high humidity air mass that originates over the oceans. |
| arctic air mass | Frigid air mass that originates over the poles. |
| polar air mass | A cool or cold air mass that originates over upper latitudes. |
| tropical air mass | A warm air mass that originates in the tropics. |
| front | The boundary where at least two different air masses meet. |
| orographic lifting | The upward movement of air masses as they flow over mountains. |
| frontal wedging | The lifting of a warm air mass above a cool air mass acting as a wedge. |
| convergence | The lifting of air when horizontal air currents from opposite directions collide and rise into the atmosphere. |
| storm | A sever weather disturbance involving high winds, heavy precipitation, and other conditions, such as lightning or low temperatures. |
| winter storm | A storm that brings heavy snow or sleet, high winds, and/or unusually cold weather. |
| thunderstorm | A rainstorm that produces lightning. |
| lightning | An atmospheric electrical discharge that occurs either between clouds or between a cloud and the ground. |
| tornado | A destructive, localized, rapidly rotating cyclonic windstorm forming a funnel. |
| hurricane | An immense cyclonic windstorm that forms over tropical or subtropical oceans. |
| tropical storm | A strong cyclonic storm with winds of at least 63 km/h (39 mi/h). |
| eye of hurricane | The low pressure center of a hurricane containing relatively clear, calm rising air. |
| storm surge | A higher than normal local sea level caused by seawater flowing toward the lower air pressure under a hurricane. |
| station model | A symbolic representation of data from a weather station on a weather map. |
| synoptic weather map | A weather map that presents a summary or synopsis of weather data for a given time frame. |
