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The Future of NEXRAD: Dual Polarization

The Future of NEXRAD: Dual Polarization. NWS: Needs Identified. NWS Statement of Need 04-004 (Additional Radar Observational Data) identified the need for additional and improved radar data to improve support to severe weather warnings flood and flash flood warnings

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The Future of NEXRAD: Dual Polarization

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  1. The Future of NEXRAD:Dual Polarization

  2. NWS: Needs Identified • NWS Statement of Need 04-004 (Additional Radar Observational Data) identified the need for additional and improved radar data to improve support to • severe weather warnings • flood and flash flood warnings • general forecast services.

  3. NEXRAD tri-agencies (DOC, DOD, DOT) Determination: • Adding Dual Polarization capability to the WSR-88D will provide the following benefits: • improved hail detection for severe thunderstorm warnings • improved rainfall estimation for flood and flash flood warnings • rain/snow discrimination for winter weather warnings and advisories • data retrieval from areas of partial beam blockage to improve services in mountainous terrain • removal of non-weather artifacts such as birds and ground clutter to improve overall data quality for algorithms and numerical model input.

  4. What is Dual Polarization?

  5. Horizontal Polarization Horizontal polarization means that the wave crests of the electric field oscillate in the horizontal direction (blue); magnetic field oscillates at right angles, vertically.

  6. Vertical Polarization Vertical polarization means that the wave crests of the electric field oscillate in the vertical direction (red); magnetic field oscillates at right angles, horizontally.

  7. NEXRAD currently is non-polarimetric radar—transmits only horizontally oriented pulses.

  8. The NEXRAD upgrade to polarimetric capabilities means that the radar will transmit horizontally polarized pulses alternating with vertically oriented pulses.

  9. What does Dual Polarization Measure? • http://www.cimms.ou.edu/~schuur/radar.html#Q5 • http://www.atmos.uiuc.edu/~snesbitt/ATMS410/files/polarimetric_radar2.ppt • Real time dual polarization data from KOUN http://www.nssl.noaa.gov/users/hondl/public_html/radar/koun.html

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