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NEXRAD Data and Products at NCDC

NEXRAD Data and Products at NCDC. National Climatic Data Center Brian Nelson John Bates Steve Ansari Stephen Del Greco NOAA/NESDIS. Outline. Brief Overview of NEXRAD Data at NCDC Products at NCDC Applications (software) Product development GEWEX connection

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NEXRAD Data and Products at NCDC

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  1. NEXRAD Data and Products at NCDC National Climatic Data Center Brian Nelson John Bates Steve Ansari Stephen Del Greco NOAA/NESDIS

  2. Outline Brief Overview of NEXRAD Data at NCDC Products at NCDC Applications (software) Product development GEWEX connection Working Group on Precipitation Radar Networks

  3. NEXRAD Overview • Weather Surveillance Radar – 1988 Doppler • Next Generation Radar • Development started in 1960s • Deployment started in 1988 • First WSR-88D Site in 1990 Norman Ok • Last Site in 1997 in Indiana • Most Sites have been operational since 1995/1996 • ~$5 million/ site • ~500 GB/radar/year

  4. NEXRAD Overview • 155 Sites (145 CONUS) • Puerto Rico, Guam, Hawaii, Alaska, etc.

  5. Level III • 20 + Products • Reflectivities • Radial Velocities • Wind Profile • Vertical Integrated Liquid • Surface Rainfall • Precipitation NEXRAD Data Level II Reflectivity Spectral Width Notch Velocity • Volume Scans • 1o x 1km • 5-6 minutes rainfall mode • Derived Products • Polar and Rectangular Gridded • From 5,6 minute to Hourly and Storm Event

  6. Entire NEXRAD Period of Record: • 1991 – Present • 1.5 Petabytes – 334,652 DVDs • Increases at 480 Gigabytes/Day • Potential increase to 6,656 Gigabytes/Day WSR-88D Radar Data Services NCDC Radar Archives: NEXRAD Level II 4,786 Requests 658 Unique Users Total Volume serviced – 39.9TB Annual Volume Ingested – 72TB NEXRAD Level III 2,421 Requests 378 Unique Users Total Volume serviced – 1.4TB Annual Volume Ingested – 2TB

  7. Precipitation Products Precipitation products available at NCDC Radar- Based Satellite- Based In-Situ Model

  8. Direct access to NEXRAD Digital Data, Data Visualization, Analysis and Export Tools via the NCDC radar resources web page URL: http://www.ncdc.noaa.gov/oa/radar/radarresources.html WSR-88D Radar Data Services Services include: Spatial Search Temporal Search File Search Order Data

  9. Software Applications Java NEXRAD Viewer http://www.ncdc.noaa.gov/oa/radar/radarresources.html

  10. Java NEXRAD Viewer Software Applications • Filter NEXRAD Export Data • Export NEXRAD to shapefiles, ESRI Grids, GrADS (coming soon: NetCDF, GeoTIFF & HDF) • Export Simple Math Results

  11. High-Resolution Microwave-Based Precipitation Analysis R&D • Quarter degree spatial, daily temporal analysis (Tom Smith, Ralph Ferraro, Yin, and others) • Microwave-based precipitation • AMSU, SSMI, AMSR-E, TRMM satellites, and gauge data • May augment with IR data to fill gaps • Latest MW algorithms for consistency • Developed an OI of MW and gauge observations • Estimation of error and scale OI statistics • Bias-adjustment method may be applied to product

  12. NOAA Multi-sensor QPE – Vision Rain Gauge Data Multisensor Precipitation Reanalysis (MPR) Real-Time Multisensor QPE NWS NCDC OAR/NSSL Radar Data Satellite Data NOAA Multisensor QPE Products & Services NESDIS/ORA Other OAR Labs External Partners NWP Model Output Data LightningData

  13. Complete Rain Gauge Data Additional NWP Model Output Multi-Sensor Precipitation REANALYSIS National Multisensor Precipitation Reanalysis Reanalysis Products Additional Satellite Data Customers NCDC Archive* WSR-88D Level II Data National Reflectivity Mosaic Customers CRAFT Real-Time Products Rain Gauge Data National Multisensor QPE NWP Model Output REAL-TIME ANALYSIS NMQ Lightning Data Satellite Data * Level II and Level III

  14. Multi-Sensor Precipitation REANALYSIS • Why precipitation? • Critical climate variable through water cycle • Critical weather and water variable • Why multisensor? • Improves accuracy, resolution, coverage • Why reanalysis? • Affords more complete and better quality-controlled input data, and “best” scientific algorithms available • Can provide consistent high-resolution high-quality products • Why now? • High-resolution high-quality precipitation data (both historical and real-time) critically needed for water management … among others. • A decade of operational experience with real-time multisensor quantitative precipitation estimation (QPE) • Experience with limited-scope/scale multisensor precipitation reanalysis • National Mosaic and Quantitative Precipitation Estimation (NMQ) Project

  15. Multi-Sensor Precipitation REANALYSIS Applications Drought Flood Management Flash Flood Prediction Water Supply Transportation Emergency Management Agriculture Debris Flows Ecosystems Management Hydrologic Design Research MPR Multi-sensor product High Resolution Unbiased Continental U.S Customers NWS NOAA Federal Agencies Tribal Agencies State Agencies Local Agencies Private Sector Academia Hydrologic, Environmental Engineers

  16. Reanalysis Research Regional Product Development CONUS Product Distribution Customer Feedback 2005 2006 2006 2007 Operational ? New Data Sources Product Re-Development Multi-Sensor Precipitation REANALYSIS Research to Operations Product Dissemination – THREDDS Data Server http://eclipse.ncdc.noaa.gov:9090/thredds/dodsC/radar/catalog.html

  17. NEXRAD and GEWEX Precipitation products can help meet Phase II Objectives Research quality data sets Biases addressed and Uncertainty characterized Energy and Water Cycle contribution to Climate Major input to Energy and Water Budget studies Space-Time characteristics of predictability of key variables Data resolution affords for assessing space-time characteristics Seasonal prediction of water and energy cycle variability Long term allows for intra and inter annual studies Assess climate prediction and global change Can be input or benchmark for climate studies

  18. WGPRN • Data Format • Data Transmission • Archive • Data Access • Resolution (Space and Time) • Algorithms Determine the feasibility of producing common precipitation products from radar networks for a common time period.

  19. WGPRN File Format #1 Visualization &Analysis CDM NetCDF file File Format #2 Common Data Model OpenDAP Server File Format #N WCS Service

  20. WGPRN • Band • Doppler Capabilities • Data Processing • Base Data • Data resolution • Data Transmission • Data format • Data Archive • C,X,S etc. • Yes, No • Radar Product Generator • Level II data (Z,V,W) • 1o by 1km • NOAAPort • Standards • National Archive Center • Attenuation • Severe Weather • Internal Standard • Variables • File size • Data Transmission • CDM • Central Location Possibilities and Associated Issues • Example at NCDC • Agreements with Canada, Mexico, Korea

  21. Conclusions 150 NEXRAD sites Data format, organization, management Provide for high resolution precipitation estimates Space scales 4km and less Temporal scales hourly and less Archive is 10+ years Allows longer term investigations Current Reanalysis project CONUS to other Continental-Scale implementations Common Data Format Data Archive Data Transmission Data Accessibility http://www.ncdc.noaa.gov/oa/radar/radarresources.html

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