Title: MZDR Author(s): Maci Gibson ORCID: 0000-0002-9714-1197 Email: maci.gibson@noaa.gov Heather Reeves ORCID: 0000-0003-1843-2218 Email: heather.reeves@noaa.gov Organization: National Severe Storms Laboratory (NSSL) and Cooperative Institute for Mesoscale Meteorological Studies (CIMMS) 120 David L. Boren Blvd, Norman, OK 73072 Phone: 405-325-6287 (email strongly preferred) 1.0 Data Set Overview Introduction: A three dimensional merge of differential reflectivity across the CONUS. Time period covered: 2019/02/05/00:00-2019/03/07/23:50 Physical location: CONUS (38.883º, -77.017º) Data source: Multi-Radar/Multi-Sensor System (MRMS) Web address references: https://vlab.ncep.noaa.gov/web/wdtd/mrms-products-guide 2.0 Instrument Description: N/A 3.0 Data Collection and Processing Data collection: N/A Derived parameters/processing techniques: see references in section 6.0 Quality assurance and control procedures: see references in section 6.0 4.0 Data Format Data file structure: NetCDF Data format/layout: Spatial resolution: 0.01º Latitude (~1.11 km) x 0.01º Longitude (~1.01 km at 25ºN and 0.73 km at 49ºN) Data is sorted from top to bottom and east to west. The upper left corner is at 55ºN and -130ºW. Vertical resolution is 23 staggered layers from 0.5 to 10 km ASL. Parameters: Differential reflectivity [dB] Data version: V12 Description of flags, codes used in data, and definitions: No echo flagged as -99900 No coverage flagged as -99903 5.0 Data Remarks PI'S assessment of data: This product does not filter or flag areas of beam blockage or partial beam blockage. Missing data periods: [fill in later] Software compatibility: 6.0 References: Lakshmanan, V., T. Smith, K. Hondl, G.J. Stumpf, and A. Witt, 2006: A real-time, three-dimensional, rapidly updating heterogeneous radar merger technique for reflectivity, velocity, and derived products. Wea. Forecasting, 21, 802-823. DOI: https://doi.org/10.1175/WAF942.1 Langston, C., J. Zhang, and K. Howard, 2007: Four-dimensional dynamic radar mosaic. J. Atmos. Ocean. Technol., 24, 776-790. DOI: https://doi.org/10.1175/JTECH2001.1 Tang, L., J. Zhang, C. Langston, J. Krause, K. Howard, and V. Lakshmanan, 2014: A physically based precipitation-nonprecipitation radar echo classifier using polarimetric and environmental data in a real-time national system. Wea. Forecasting, 29, 1106–1119. DOI: https://doi.org/10.1175/WAF-D-13-00072.1 Tang, L., J. Zhang, M. Simpson, A. Arthur, H. Grams, Y. Wang, and C. Langston, 2020: Updates on the radar data quality control in the MRMS quantitative precipitation estimation system. J. Atmos. Ocean. Technol., 1–50.