A large body of air that has consistent properties throughout , such as temperature and moisture content , at a given altitude .
The pressure caused by the weight of a column of air in Earth's atmosphere .
A more portable type of barometer .
A weather system with a swirling center of high air pressure .
A layer of gases that surrounds the Earth .
A colorful display of light in the ionosphere , produced when charge particles form the sun are attracted to Earth's magnetic poles .
An instrument used to measure air pressure .
Thin , white , wispy clouds , often with a feathery or veil - like appearance .
A dense , visible mass of tiny water droplets or ice crystals that are suspended in the atmosphere .
A front that occurs when a cold air mass overtakes a warm air mass .
Puffy white clouds , usually with flat balloons , that look like piles of cotton balls .
A weather system with a center of low air pressure .
The temperature at which air becomes saturated with water vapor .
A day that marks the beginning of spring or autumn ; a day on which the length of daylight and darkness are approximately equal .
A cloud that is touching or is near to the ground .
A sharply defined boundary that forms when two alike air masses meet .
A large tropical cyclone with winds of at least 119 kilometer per hour (74 miles per hour) .
A region of charge particle , or ions , in Earth's atmosphere that overlaps the lower thermosphere .
A sudden naturally occurring electrical discharge in the atmosphere .
A front that occurs when a warm air mass is caught between two cooler air masses .
A region of ozone concentration in the stratosphere .
The ratio of the amount of water vapor in the air to the maximum amount of water vapor that air can contain at that temperature .
The movement of one body around another .
The spinning of a planet or moon on its axis .
The day that marks the start of summer or winter , the day when the sun is directly overhead at latitude 23.5 degrees north or latitude 23.5 degrees south .
A front that occurs when two air masses have formed a boundary , but neither is moving .
Flat layers of clouds that are covered much all of the sky .
A small , But intense windstorm that takes the form of a rotating column of air that touches the ground .
The sound produced by rapidly expanding air along the path of the lightning discharge .
A small weather system that includes thunder and lightning .
A front that occurs when a warm air mass overtakes a cold air mass .
The condition of the atmosphere at a particular time .