SUBREFRACTION Less than normal bending of light or a radar beam as it passes through a zone of contrasting properties, such as atmospheric density, water vapor, or temperature. Related term: superrefraction ...
Subrefraction The bending of the radar beam in the vertical which is less than under standard refractive conditions. This causes the beam to be higher than indicated, and lead to the underestimation of cloud heights.
subrefraction—Less than normal bending of the radar beam resulting from abnormal vertical gradients of temperature and/or water vapor.
The term "subrefraction" is applied when there is abnormal upward bending of the radar beam.
 See also: Earth, Storm, Advection, Temperature, Synoptic
  
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