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

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Presentation transcript:

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) Reflectivity KTLX 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

VCP 21

Resolution Comparison Level II velocity, Mesonet, & RUC20 20km RUC Wind Mesonet KTLX 02:13UTC, 22 June 2004

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

Real-Time Radar Wind Analysis and Monitoring System LDM Real Time Level II data LDM Real Time Level II data WG Convert data format and display WG Convert data format and display Workstation Web Display Web Display QC Real-time Wind Retrieval Real-time Wind Retrieval Monitoring System Raw DataNetCDF Dataeps File PC

Management System for 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

Monitoring 9 radars in Oklahoma & vicinity Displaying current status and time series of past 24 h

Monitoring 8 radars in New England

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

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

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

AP Ground Clutter Detection Existing Method RawAP Mitigated Expert Truth 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

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

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

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

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

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

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

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

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

NSSL Polarimetric Radar: KOUN KOUNKTLX  HV Reflectivity Bird Storm 08:52UTC 24 May 2003

Phased Array Radar at NWRT

Tornado Vortex Signature (TVS) Observed by Phase Array Radar May :36UTC ReflectivityDoppler Velocity TVS

Squall Line Observed by Phase Array Radar June :50UTC ReflectivityDoppler Velocity Elev.angle =0.75 o BeamWidth=1.6 o, GateWidth=240m, NyqVel=23.40m/s