| A | B |
|---|
| air mass | a large volume of air with the same temperature and humidity at different locations at the same altitude |
| front | the boundary between air masses |
| high-pressure system | a weather system that occurs when air sinks down in a high-pressure center and spreads out towards areas of lower pressure as it nears the ground |
| low-pressure system | a weather system that occurs when air moves around and into a low-pressure center, then moves up to higher altitudes |
| tropical storm | a low-pressure system that starts in the tropics with winds of at least 65 kilometers per hour but less than 120 kilometers per hour |
| hurricane | a tropical low-pressure system with sustained winds of 120 kilometers per hour or more |
| storm surge | a rapid rise in water level in a coastal area that occurs when a hurricane pushes a huge mass of ocean water |
| blizzard | a blinding snow storm with winds of at least 56 kilometers per hour usually with temperatures below -7˚C |
| thunderstorm | a storm with lightning and thunder |
| tornado | a violently rotating column of air stretching from a cloud to the ground |
| meteoroligist | a scientist who studies weather |
| isobar | a line on a weather map connecting places that have the same air pressure |
