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APPENDIX I - CONTINUED - 14271_117
APPENDIX II OCTANTS OF THE GLOBE

Aerographers Mate, Module 03-Environmental Satellites and Weather Radar
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THIN  LINE  ECHO—A  narrow,  elongated  non- precipitating   echo   usually   associated   with thunderstorm  outflow,  fronts,  or  other  density discontinuities. Also called a fine line. THRESHOLD VALUE—An  adaptable  parameter which serves as a minimum or maximum value that phenomena must or must not exceed to be accepted  by  an  algorithm  or  displayed  on  a product. TIROS—Television  InfraRed  Operational  Satellite. U UHF—Ultra high frequency. (300 MHz to 3 GHz.) V VAS—Vertical  Atmospheric  Sounder. VEERING—A  change  in  the  wind  direction  in  a clockwise manner in the Northern Hemisphere, or a   counterclockwise   manner   in   the   Southern Hemisphere. VELOCITY  ALIASING—Ambiguous   detection and display of radial velocities. VHF—Very high frequency. (30 MHz to 300 MHz.) VOLUME  COVERAGE  PATTERN—A     vol- umetric sampling procedure. A combination of elevation  slices  designed  to  provide  radar coverage  over  a  specific  volume  of  the atmosphere. VOLUME  SCAN—The completion of a sequence of 360° scans at prescribed elevation angles to obtain a three-dimensional view around the radar site. VOLUMETRIC  PRODUCT—Any   product   the WSR-88D produces which requires data from the entire volume coverage pattern before processing can  be  completed. VORTEX— In   its   most   general   use,   any   flow possessing vorticity. More often the term refers to converging flow producing rotation. A tornado is a vortex. W WATER  VAPOR  IMAGE—A   satellite   image derived from the thermal energy emitted by water vapor, usually at the 6.7 micrometerwavelength. WEAK  ECHO  REGION  (WER)—Within    a convective  echo,  a  localized  minimum  of equivalent reflectivity associated with a strong updraft  region. WEFAX—An   acronym   for   weather   facsimile, specifically  the  NWS  service  providing  satellite imagery and graphic products via a geostationary satellite  data  broadcast. AI-6







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