| A | B |
|---|
| Air Mass | A large region of the atmosphere where the air has similar properties throughout. |
| Anemometer | A weather instrument that measures wind speed. |
| Barometer | A weather instrument that measures air pressure. |
| Climate | The average weather pattern of a region (weather data collected over time). |
| Condensation | The changing of water from a gas to a liquid in the water cycle. |
| Convection Cell | A circular pattern of air rising, air sinking, and wind. |
| Cumulonimbus Cloud | A tall cloud that produces severe weather. |
| Drought | A long period when an area does not receive enough precipitation to support plant growth. |
| El Niño | A temporary heating of the Pacific Ocean near the equator. A strong El Niño causes wet winters in the Southeastern US. |
| Fog | A cloud at ground level. |
| Gulf Stream | A warm ocean convection current, moving northeastwards from the Gulf of Mexico along the Atlantic Coast of the US. The Gulf stream moderates weather along the eastern seaboard, warming the air and land there during the cooler months. |
| Humidity | The amount of water vapor in the air. |
| Insolation | The amount of the sun’s energy that reaches the Earth at any given time. |
| Jet stream | A strong band of winds moving from the west to the east, which affects the formation of weather fronts. |
| Land Breeze | Wind that blows from the land to the sea. |
| Longitude | Imaginary lines on Earth that show how far east or west a location is from the Prime Meridian. |
| Relative Humidity | A comparison between how much water vapor is in the air and how much the air could hold. |
| Sea Breeze | Wind that blows from the sea to the land. |
| Storm Surge | A great rise of the water along a shore caused by low air pressure, seen when hurricanes come close to land. |
| Thunderstorm | The most common sever storm, formed by a cumulonimbus cloud. |
| Transpiration | The process of plants losing moisture through evaporation. This evaporated water enters the water cycle. |
| Types of precipitation | Rain; Snow; Sleet; Hail. |
| Snow | precipitation that grows as ice crystals because of low temperatures in the air and on the ground |
| Hail | droplets of water that fall and rise over and over, freezing more layers of ice with each rise and fall |
| Water currents | The Gulf Stream in the Atlantic Ocean, and El Niño and La Niña in the Pacific Ocean. These water currents affect the formation of weather fronts. |
| Water Vapor | Water that is in the air in the form of a gas. |
| Westerlies | Global winds existing between 30 and 60 degrees latitude that blow from west to east. |
| Wind Direction | The direction wind is moving. |
| Wind Vane | A weather instrument that measures wind direction. |
