The removable lid of the case. Also called a cover plate.

A portion of the pen that covers the point while the pen is not in use, and usually can be posted (attached) to the back of the pen during writing.

A layer of warm air, several thousand feet above the surface, which suppresses or delays the development of thunderstorms. If the air is unstable enough, explosive thunderstorm development can occur if the cap is removed or weakened (for example, when colder air moves in).

(or Capping Inversion) - a layer of relatively warm air aloft (usually several thousand feet above the ground) which suppresses or delays the development of thunderstorms

Composed of a layer of warmer, dryer air aloft which may suppress or delay the development of thunderstorms. As an air parcel rises into this area, it becomes too cool to rise further. Also referred to as a lid.

Composed of a layer of warmer, dryer air aloft which may suppress or delay the development of thunderstorms. As an air parcel rises, it becomes cooler relative to the ambient, or surrounding, air in the cap and therefore, less buoyant and unable to rise further. Also referred to as a lid.

"THE MORNING SOUNDING INDICATES A CAP AT 600MB", an inversion aloft that serves to put a lid on instability, making thunderstorms less likely, unless MIXING breaks the cap.

part of the pen that is placed over the nib end when not in use. Protects the nib from damage & everything else from ink. Referring to the cap as a lid or top is just as "criminal" as referring to the nib as a tip or point.

A layer of relatively warm air aloft (usually several thousand feet above the ground) which suppresses or delays the development of thunderstorms. Air parcels rising into this layer become cooler than the surrounding air, which inhibits their ability to rise further. As such, the cap often prevents or delays thunderstorm development even in the presence of extreme instability. However if the cap is removed or weakened, then explosive thunderstorm development can occur. sounding. The cap is an important ingredient in most severe thunderstorm episodes, as it serves to separate warm, moist air below and cooler, drier air above. With the cap in place, air below it can continue to warm and/or moisten, thus increasing the amount of potential instability. Or, air above it can cool, which also increases potential instability. But without a cap, either process (warming/moistening at low levels or cooling aloft) results in a faster release of available instability - often before instability levels become large enough to support severe weather development.

(Also called lid.) A region of negative buoyancy below an existing level of free convection (LFC) where energy must be supplied to the parcel to maintain its ascent. This tends to inhibit the development of convection until some physical mechanism can lift a parcel to its LFC. The intensity of the cap is measured by its convective inhibition. The term capping inversion is sometimes used, but an inversion is not necessary for the conditions producing convective inhibition to exist.