– A line of thunderstorms or squalls extending over several hundred miles.

– air with little or no tendency to rise, that is usually accompanied by clear dry weather.

– A pressure system which shows up in the same general location on every height analysis or forecast chart. This is an indication low pressure is weakening (filling) or a pressure system is stalling.

– A transition zone between airmasses, with neither advancing upon the other.

– Damaging thunderstorm winds produced as air rushes downward from a thunderstorm. Often called gust fronts, downburst, or microburst winds these winds originate from thunderstorm downdrafts and may produce damage similar to that of a tornado.

– The layer of the atmosphere above the troposphere, where temperature increases with height.

– Flat low level clouds.

– Sinking air that is associated with warming air and little cloud formation.