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NOAA NSSL MRMS MergedKdp, MergedRhoHV, and MergedZdr Data



A three dimensional merge of specific differential phase (Kdp), correlation coefficients (RhoHV) and  differential reflectivity (Zdr) across the CONUS are contained in this dataset from the ICICLE (In-Cloud ICing and Large-drop Experiment) domain in tarred and gzipped NetCDF format.  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.The file naming format is "ICICLE_Merged*_yy-xx_20190205-20190307_netCDF.tar.gz" where yy-xx is the vertical resolution. This experimental product is the first iteration and may contain some artifacts/oddities. The domain covers only the area of the ICICLE field campaign. No MRMS data are available prior to 5 February due to the federal government shutdown in early 2019.

Any public presentations/publications using this data must include NSSL as co-author.

Archive note

NOTE: This is a large dataset. Order limitations are 32GB per order, so please check file sizes when ordering.  

IMPORTANT: For each order, unzip and untar the files in a separate directory with sufficient size (1-2TB) to ensure that files are not overwritten. Some of these files may untar/unzip to hundreds of Gigabytes.

Data access

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Additional information

Data Quality final
  • 1.0 (2021-11-15)
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Related projects
Frequency continuous
Language English
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Temporal coverage

Begin datetime 2019-02-05 00:00:00
End datetime 2019-03-07 23:59:59

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 55.00, Minimum (South) Latitude: 20.00
Minimum (West) Longitude: -130.00, Maximum (East) Longitude: -60.00

Primary point of contact information

Heather Reeves <>

Additional contact information


Example citation following ESIP guidelines:

Reeves, H. 2021. NOAA NSSL MRMS MergedKdp, MergedRhoHV, and MergedZdr Data. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 01 Oct 2023.

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