Changes in temperature caused by the expansion (cooling) or compression (warming) of a body of air as it rises or descends in the atmosphere, with no exchange of heat with the surrounding air.
The transport of an atmospheric property such as temperature or moisture by wind.
The whole mass of air that surrounds and is bound to the Earth.
Base Reflectivity is the default NEXRAD weather radar image. Taken from the lowest (½° elevation) slice, it is the primary image.
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 and produce thunderstorms. Sometimes called the lid.
Convective Available Potential Energy. CAPE is directly related to the maximum potential vertical speed within an updraft; higher values indicate greater potential for severe weather.
The generally prevailing weather conditions of a region over a period of years. Some elements of climate include average high temperatures for a particular day or normal precipitation for a month or season.
The scientific study of climates; the science that deals with climates and/or climate conditions and their phenomena
A zone separating two air masses, of which the cooler, denser mass is advancing and replacing the warmer.
The composite reflectivity is the maximum dBZ reflectivity from any of the reflectivity angles of the NEXRAD weather radar
The transport of heat and moisture by the movement of a fluid; In meteorology, the term is used specifically to describe vertical transport of heat and moisture in the atmosphere, especially by updrafts and downdrafts in an unstable atmosphere. Cumulonimbus, towering cumulus clouds and alto-cumulus castellanus clouds are all visible forms of convection. Convection is [...]
Tending to move toward one point or to approach each other. Convergence in a horizontal wind field indicates that more air is entering a given area than is leaving at that level. Convergence at low levels may result in upward forcing; at higher levels convergence may result in downward forcing. When other factors such as [...]
In the Northern Hemisphere, circulation or rotation which is counter-clockwise. In the Southern Hemisphere, clock-wise.
A measure of atmospheric moisture, specifically the temperature to which the air must be cooled to reach saturation, assuming constant moisture and pressure. When the air reaches dewpoint, visible drops of water form.
The changing of wind direction with height.
To split and move out in different directions from a single point, usually said of horizontal winds. Divergence at upper levels of the atmosphere enhances upward motion, and hence the potential for thunderstorm development.
Any high flow, overflow, or inundation by water which causes or threatens damage.
A statement of prediction
The altitude at which the air temperature first drops below freezing.
Precipitation falling from a cumulonimbus cloud in the form of pellets or balls of ice greater than 5mm in diameter. Hailstones are usually composed of concentric layers of clear ice and compact snow.