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Real-time Doppler Wind Quality Control and Analysis

Real-time Doppler Wind Quality Control and Analysis. Qin Xu National Severe Storms Laboratory/NOAA Pengfei Zhang, Shun Liu, and Liping Liu CIMMS/University of Oklahoma. WSR-88D Network. Volume Coverage Pattern (VCP). 4 VCP Precipitation Mode VCP11: 14 tilts, 5 min VCP21: 9 tilts, 6 min

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Real-time Doppler Wind Quality Control and Analysis

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  1. Real-time Doppler Wind Quality Control and Analysis Qin Xu National Severe Storms Laboratory/NOAA Pengfei Zhang, Shun Liu, and Liping Liu CIMMS/University of Oklahoma

  2. WSR-88D Network

  3. Volume Coverage Pattern (VCP) 4 VCP Precipitation Mode VCP11: 14 tilts, 5 min VCP21: 9 tilts, 6 min Clear Air Mode VCP31: 5 tilts, 10 min VCP32: 5 tilts, 10 min 2 new VCP Reflectivity KTLX

  4. VCP 21

  5. Resolution ComparisonLevel II velocity, Mesonet, & RUC20 RUC Wind Mesonet 20km KTLX 02:13UTC, 22 June 2004

  6. Level II Doppler Velocity Spatial resolution 1o, 250 m Temporal resolution 5, 6 or 10 min Range Folding KTLX Aliasing 5km 50 km

  7. Real-Time Radar Wind Analysis and Monitoring System Monitoring System Raw Data NetCDF Data eps File QC QC LDM Real Time Level II data WG Convert data format and display Real-time Wind Retrieval Web Display PC Workstation

  8. Management Systemfor Real-time Radar Wind Analysis • Automated functions: • Auto-monitor the data flow & computer usage in the RWR (Real-time Wind Retrievals), display the current & past 24 h status on the web; • Auto-restart & backup RWR (if it is down) to maintain uninterrupted operation; • Auto-collect and display statistical parameters & indices for radar data quality control and related research developments. QC QC

  9. Monitoring 9 radars in Oklahoma & vicinityDisplaying current status and time series of past 24 h

  10. Monitoring 8 radars in New England

  11. Doppler velocity quality problems 1) Bird contamination 2) Noisy velocity field 3) Anomalous propagation (AP) caused ground clutter 4) Doppler velocity aliasing and range folding

  12. Noisy velocity field KBOX 00:22UTC 28 Oct. 2002

  13. Quality control (QC) parameter: Percentage of sign change (PSC) Too Noisy Normal

  14. Raw AP Mitigated Expert Truth AP Ground Clutter DetectionExisting Method Information used for AP detection (Kessinger et al. 2003): Texture of reflectivity, radial velocity, vertical gradient of reflectivity, and spectrum width Saint Louis KLSX 03:34UTC , July 07,1993

  15. Doppler Velocity Detected AP Ground Clutter DetectionAdditional method to deal with problems caused by moving vehicles Salt Lake radar (KMTX) 23:51UTC, Sept. 19,1999

  16. Migrating-bird QC Parameters KTLX May 1, 2003 Z Vr Hour

  17. 2dVar Wind Analysis Flowchart Real-time WSR-88D level II data QC dealiasing Produce VAD background 2dVar wind analysis (with Rd = 60 km & then 20 km)

  18. Real-Time Vector Wind Retrieval (Product) Reflectivity Doppler Velocity 120km 120km 20m/s KTLX 20:03UTC 02 June 2004

  19. Resolution comparison Radar retrievals vs Mesonet winds KTLX 16:01UTC, 19 May 2004

  20. Full Spatial Resolution Display KTLX 10 km KTLX 02:13 UTC, 22 June 2004

  21. Mosaic Wind Field ? NOT on Constant Altitude! KINX KTLX KSRX 17:14 UTC, 27 April 2004

  22. High Resolution Real-Time 2dSA Wind Retrieval 2dSA (at 0.5o) 41x41 grid with ∆x=∆y=250m Moving Frame U = 8.3 m/s V = 5.3 m/s KTLX 22:15 to 22.20 UTC, 8 May 2003

  23. NSSL Polarimetric Radar: KOUN KOUN KTLX Bird Storm rHV Reflectivity 08:52UTC 24 May 2003

  24. Phased Array Radar at NWRT

  25. Tornado Vortex Signature (TVS) Observed by Phase Array RadarMay 30 2004 02:36UTC Reflectivity Doppler Velocity TVS

  26. Squall Line Observed by Phase Array RadarJune 2 2004 21:50UTC Reflectivity Doppler Velocity Elev.angle =0.75o Elev.angle =0.75o BeamWidth=1.6o, GateWidth=240m, NyqVel=23.40m/s

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