NCEP/EMC U.S. Gridded Radar-Estimated Precipitation w/ no bias removal (4km) https://data.eol.ucar.edu/dataset/21.090 Summary This dataset contains the National Centers for Environmental Prediction (NCEP) Environmental Modeling Center (EMC) 4 KM GRIB radar estimate (no bias removal) "RAD" data. A prototype, real-time, hourly, multi-sensor National Preciptation Analysis (NPA) has been developed at NCEP in cooperation with the Office of Hydrology (OH). This analysis merges two data sources that are currently being collected in real-time by OH and NCEP. Hourly digital precipitation (HDP) radar estimates are created by the WSR-88D Radar Product Generator on a 131 X 131 4-km grid centered over each radar site. Data analysis routines, including a bias correction of the radar estimates using rain gage data, have been adapted by NCEP on a national 4-km grid from algorithms developed by OH and executed regionally at NWS River Forecast Centers (RFC). This dataset only contains the NCEP 4 KM GRIB Data hourly, 6-hourly, and daily radar estimate (no bias removal). 6-hourly data are generally available at 00Z, 06Z, 12Z, and 18Z. Daily data are generally available at 12Z. Depending on the time period selected, all three datasets may or may not be available. Other NCEP 4 KM GRIB Data including gage-only analysis, multi-sensor analysis (gage and unbiased radar), radar estimate after bias removal, and gage-only analysis using 24h accumulated ("RFC") data are available as independent datasets. Depending on the time period selected, all five types may or may not be available. Please see GCIP/EOP: Surface NCEP Ancillary Catalogue of Available GCIP Precipitation Data (NCEP/EMC). The format of the files is GRIB. The files are compressed using the UNIX "compress" command and "uncompress" must be used before decoding. This dataset is provided as is and was not quality controlled by UCAR/JOSS. Beginning 1 Jan 2002, the analysis grid has been changed to conform with the official NWS HRAP grid. File names have also been changed. See the readme provided with this dataset for details. As of April 2017 this data includes Alaska and Puerto Rico stations. 26 March 2020 - Data for 01 January 2020 was added when it was determined that this date had been omitted. 15 January 2020 - Data for 26 September 2019 was added when it was determined that this date had been omitted. 31 August 2020: Start and end dates/times on the files were updated. 7 October 2020: Stage 2 files will not be available after 28 July 2020. 3 February 2021: Files missing from January 2002 and January 2012 were added. Missing Data: April 4, 2019 - all data missing September 26, 2019 - all data missing November 20, 2019 - some stage 2 and some stage 4 missing November 21, 2019 - some stage 2 missing January 1, 2020 - all stage 4 and some stage 2 missing Identifiers * Local archive identifier: 21.090 * doi:10.26023/7N6P-7ASY-T10P https://doi.org/10.26023/7N6P-7ASY-T10P Versions 1.0 Citation Du, J. 2011. NCEP/EMC U.S. Gridded Radar-Estimated Precipitation w/ no bias removal. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.26023/7N6P-7ASY-T10P Accessed 19 Apr 2024. Additional citation styles can be generated by entering the DOI at CrossCite (https://citation.crosscite.org/). Acknowledgement In addition to the citation reference and any other acknowledgements, please acknowledge NCAR/EOL in your publications with text such as: Data provided by NCAR/EOL under the sponsorship of the National Science Foundation. https://data.eol.ucar.edu/ Related projects * IHOP_2002: International H2O Project 2002 https://data.eol.ucar.edu/project/IHOP_2002 * OWLeS: Ontario Winter Lake-effect Systems https://data.eol.ucar.edu/project/OWLeS * CuPIDO: Cumulus Photogrammetric, In-Situ and Doppler Observations https://data.eol.ucar.edu/project/CuPIDO * SAVANT: Stable Air Variability and Transport https://data.eol.ucar.edu/project/SAVANT * VORTEX-SE_2017: Verification of the Origins of Rotation in Tornadoes EXperiment-Southeast (VORTEX-SE) 2017 Field Campaign https://data.eol.ucar.edu/project/VORTEX-SE_2017 * ICICLE: In-Cloud Icing and Large-Drop Experiment https://data.eol.ucar.edu/project/ICICLE * LPB: La Plata River Basin https://data.eol.ucar.edu/project/LPB * VORTEX2: Verification of the Origins of Rotation in Tornadoes Experiment 2 https://data.eol.ucar.edu/project/VORTEX2 * CHEESEHEAD: Chequamegon Heterogeneous Ecosystem Energy-balance Study Enabled by a High-density Extensive Array of Detectors https://data.eol.ucar.edu/project/CHEESEHEAD * GCIP/EOP: GCIP Enhanced Observing Period https://data.eol.ucar.edu/project?GCIP%2FEOP * IDEAL: Instabilities, Dynamics and Energetics accompanying Atmospheric Layering https://data.eol.ucar.edu/project/IDEAL * MPEX: Mesoscale Predictability Experiment https://data.eol.ucar.edu/project/MPEX * NAME: North American Monsoon Experiment https://data.eol.ucar.edu/project/NAME * T-REX: Terrain-induced Rotor Experiment https://data.eol.ucar.edu/project/T-REX * DC3: Deep Convective Clouds & Chemistry Project https://data.eol.ucar.edu/project/DC3 * BAMEX: Bow Echo and Mesoscale Convective Vortex Experiment 2003 https://data.eol.ucar.edu/project/BAMEX * Operational: Operational Datasets https://data.eol.ucar.edu/project/Operational * PLOWS: Profiling of Winter Storms https://data.eol.ucar.edu/project/PLOWS * VORTEX-SE_2018: The Verification of the Origins of Rotation in Tornadoes Experiment Southeast (VORTEX-SE) 2018 Field campaign https://data.eol.ucar.edu/project/VORTEX-SE_2018 * WINTRE-MIX: Winter Precipitation Type Research Multi-scale Experiment https://data.eol.ucar.edu/project/WINTRE-MIX * Meso18-19: Verification of the Origins of Rotation in Tornadoes EXperiment-Southeast (VORTEX-SE) Meso18-19 https://data.eol.ucar.edu/project/Meso18-19 * VORTEX-SE_2016: Verification of the Origins of Rotation in Tornadoes EXperiment-Southeast (VORTEX-SE) 2016 Field Campaign https://data.eol.ucar.edu/project/VORTEX-SE_2016 * TORUS_2019: Targeted Observation by Radars and UAS of Supercells 2019 https://data.eol.ucar.edu/project/TORUS_2019 Additional information * Spatial Type: point * Frequency: hourly * Language: English Categories * Precipitation * Radar * Surface Platforms * Fixed Observation Stations Instruments * Doppler Radar * NEXt Generation RADar (NEXRAD) * Radar GCMD Science Keywords * EARTH SCIENCE > ATMOSPHERE > PRECIPITATION > PRECIPITATION AMOUNT > HOURLY PRECIPITATION AMOUNT Documentation * katz_missing_data.txt [13 KiB] https://data.eol.ucar.edu/file/download/4219451C6E9/katz_missing_data.txt * katz_stage4_readme.txt [13 KiB] https://data.eol.ucar.edu/file/download/421945C2/katz_stage4_readme.txt Related links * companion: 21.081: NCEP/EMC Ancillary Catalog of Available GCIP Precipitation Data 2002- https://data.eol.ucar.edu/dataset/21.081 * companion: 21.009: NCEP/EMC U.S. Precipitation Ancillary Station List https://data.eol.ucar.edu/dataset/21.009 * superceded_by: 21.006: GCIP/EOP Surface: Precipitation NCEP/EMC 4 KM Gridded Dataset (GRIB) https://data.eol.ucar.edu/dataset/21.006 * info: Hourly Precipitation Analysis at NCEP/EMC http://www.emc.ncep.noaa.gov/mmb/SREF/pcpanl/ Temporal coverage * Begin datetime: 2001-12-31 12:00:01 * End datetime: 2020-07-28 11:00:00 Spatial coverage * Maximum (North) Latitude: 71.413 * Minimum (South) Latitude: 17.853 * Minimum (West) Longitude: -176.836 * Maximum (East) Longitude: -65.544 Primary contact information * pointOfContact: Jun Du https://data.eol.ucar.edu/contact/show/2568 Additional contact information * author: Jun Du https://data.eol.ucar.edu/contact/show/2568 Alternate metadata formats * DataCite: https://data.eol.ucar.edu/dataset/21.090?format=datacite * ISO/TC 211: https://data.eol.ucar.edu/dataset/21.090?format=isotc211