Elevated Convection - Convection occurring within an elevated layer, i.e., a layer in which the lowest portion is based above the earth's surface. Elevated convection often occurs when air near the ground is relatively cool and stable, e.g.
Elevated Convection A thunderstorm which occurs above a frontal inversion on the cold side of the surface cold front.
elevated convection"Convection that originates from an atmospheric layer above the boundary layer.
In cases of elevated convection, stability indices based on near-surface measurements (such as the lifted index) typically will underestimate the amount of instability present.
Situations involving isentropic lift often are characterized by widespread stratiform clouds and precipitation, but may include elevated convection in the form of embedded thunderstorms.
Consequently, this stability index evaluates the potential for elevated convection, and adds insight where surface-based indices fail.
to erroneously as overrunning, but more accurately describes the physical process by which the lifting occurs. Situations involving isentropic lift often are characterized by widespread stratiform clouds and rain, but may include elevated convection ...
Convection occurring within a surface-based layer, i.e., a layer in which the lowest portion is based at or very near the earth's surface. Compare with elevated convection.
Surge ...
SURFACE BASED - Weather systems occurring in the lowest levels of the atmosphere and involving air near or just above the ground. Surface based convection involves air from near the ground to rise. Different from ELEVATED convection where air rises ...
Compare with elevated convection.SurgeIn solar-terrestrial terms, a jet of material from active regions that reaches coronal heights and then either fades or returns into the chromosphere along the trajectory of ascent.
 See also: Thunder, Layer, Convection, Surface, Weather
  
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