overrunning"A condition existing when an air mass aloft is in motion relative to another air mass of greater density at the surface.
Overrunning - A weather pattern in which a relatively warm air mass is in motion above another air mass of greater density at the surface.
OVERRUNNING This occurs when a relatively warm air mass is forced above a cooler air mass of greater density. Weather generally associated with this event includes cloudiness, cool temperatures, and steady precipitation.
Overrunning The process whereby less dense air displaces more dense air by flowing up and over the denser air; occurs along a warm front.
Overrunning- A condition that exists when a relatively warm air mass moves up and over a colder and denser air mass on the surface. The result is usually low clouds, fog and steady, light precipitation.
Overrunning - A condition that exists when an air mass moves up and over a denser air mass on the surface. The result is usually low clouds, fog and steady, light precipitation.
Overrunning often is applied to the case of warm air riding up over a retreating layer of colder air, as along the sloping surface of a warm front.
Overrunning- The flow of warm air over cold air in advance of a warm front.
Ozone- An unstable oxygen compound that is a pollutant at ground level, but that absorbs deadly ultraviolet rays in the stratosphere.
2. Overrunning: When warmer less-dense air flows up and over colder more-dense surface air.
Low-level warm advection sometimes is referred to (erroneously) as overrunning. Although the two terms are not properly interchangeable, both imply the presence of lifting in low levels.
Isentropic lift often is referred to erroneously as overrunning, but more accurately describes the physical process by which the lifting occurs.
in an overrunning scenario. Effects on the weather may include cold temperatures, freezing precipitation, and extensive cloud coverCADASCentralized Automated Data Acquisition System - a system of two minicomputers in NWSH.
In most cases, freezing rain results from the process of warm moist air "overrunning" colder air. Perhaps the most common overrunning scenario occurs as warm moist air flows up and over a warm front associated with a midlatitude cyclone.
Transport of warm air into an area by horizontal winds. Low-level warm advection sometimes is referred to (erroneously) as overrunning. Although the two terms are not properly interchangeable, both imply the presence of lifting in low levels.
Warm Air Advection Transport of warm air into an area by horizontal winds. Low-level warm advection sometimes is referred to (erroneously) as overrunning.
 See also: Air, Precipitation, Cloud, Surface, Water
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