NCEP/EMC U.S. Gridded Multi-Sensor Precipitation (4 km)

This dataset contains the National Centers for Environmental Prediction (NCEP) Environmental Modeling Center (EMC) 4 KM GRIB multi-sensor analysis ("MUL") 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 multi-sensor hourly, 6-hourly, and daily analysis (gage and unbiased radar). 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, radar estimate, 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.

To Access Resource:

Questions? Email Resource Support Contact:

  • EOL Data Support
    datahelp@eol.ucar.edu

Temporal Range

  • Begin:  2001-12-31T12:00:01Z
    End:  2020-07-28T11:00:00Z

Keywords

Resource Type dataset
Temporal Range Begin 2001-12-31T12:00:01Z
Temporal Range End 2020-07-28T11:00:00Z
Temporal Resolution N/A
Bounding Box North Lat 71.41300
Bounding Box South Lat 17.85300
Bounding Box West Long -176.83600
Bounding Box East Long -65.54400
Spatial Representation grid
Spatial Resolution N/A
Related Links

Documentation #1 : katz_missing_data.txt

Documentation #2 : katz_stage4_readme.txt

21.081 : is a companion to dataset 21.089

21.009 : is a companion to dataset 21.089

21.006 : is superseded by dataset 21.089
Additional Information N/A
Resource Format Unix Compressed (.Z) Gridded Binary (GRIB) Format (application/x-compress)
GNU Zip Compressed (.gz) Gridded Binary (GRIB) Format (application/x-gzip)
GNU Zip (.gz) Format (application/x-gzip)
Standardized Resource Format Archive
GRIB
Asset Size 10946 MB
Legal Constraints

none
Access Constraints none
Software Implementation Language N/A

Resource Support Name EOL Data Support
Resource Support Email datahelp@eol.ucar.edu
Resource Support Organization N/A
Distributor N/A
Metadata Contact Name EOL Data Support
Metadata Contact Email datahelp@eol.ucar.edu
Metadata Contact Organization N/A

Author Jun Du
Publisher N/A
Publication Date 2011-08-11T16:05:55
Digital Object Identifier (DOI) https://doi.org/10.26023/ND33-FMMX-H00C
Alternate Identifier 21.089
Resource Version 1.0
Topic Category climatologyMeteorologyAtmosphere
Progress completed
Metadata Date 2025-10-07T21:46:54Z
Metadata Record Identifier edu.ucar.eol::21.089
Metadata Language eng; USA
Suggested Citation Jun Du. (2011). NCEP/EMC U.S. Gridded Multi-Sensor Precipitation (4 km). 1.0. https://doi.org/10.26023/ND33-FMMX-H00C. Accessed 04 November 2025.

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