Atmospheric Radiation Measurement Climate Research Facility US Department of Energy

saprvad > Scanning ARM Precipitation Radar (SAPR) Velocity Azimuth DisplayInstrument Type(s) > Baseline • Evaluation

The Velocity Azimuth Display (VAD, historical term) product contains retrievals of the zonal (north/south) and meridional (east/west) wind speed components, in precipitating systems, as a function of time and height. This product, which uses azimuthal variations in radial air velocity, allows quick insight into wind speed and wind direction in the vicinity of the radar when rainfall or snowfall is present. 

VAD data are derived from Corrected Moments in Antenna Coordinates Version 2 (CMAC2) using code within the Python ARM Radar Toolkit (Py-ART), an open-source architecture for interacting with radar data in the Python programming language. 


The purpose of this dataset is to be able to observe horizontal winds at different heights to provide information on the dynamics of the atmosphere.

Primary Measurements


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Data Details

Developed By Scott Collis | Jason Hemedinger
Contact Scott Collis
Resource(s) Data Directory
Data format netcdf
Site SGP
Content time range 14 December 2010 - 26 February 2019
Attribute accuracy Winds in the data set were compared to those in a radar wind profiler found at the SGP site.
Positional accuracy No formal positional accuracy tests were conducted
Data Consistency and Completeness Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Access Restriction No access constraints are associated with this data.
Use Restriction No use constraints are associated with this data.
File naming convention
Directory Organization These files are daily files and are located in a directory called sgpxsaprvadI5.c1.
Citations Michelson, D. B., Andersson, T., Koistinen, J., Collier, C. G., Riedl, J., Szturc, J., Gjertsen, U., Nielsen, A. and Overgaard, S. (2000) BALTEX Radar Data Centre Products and their Methodologies. In SMHI Reports. Meteorology and Climatology. Swedish Meteorological and Hydrological Institute, Norrkoping.


Theisen A, Y Feng, A Matthews, K Johnson, E Schuman, A Lindenmaier, T Wendler, V Castro, S Giangrande, S Collis, D Zhang, J Mather, and J Comstock. 2022. ARM FY2023 Radar Plan. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-282. 10.2172/1888480.


Dorsey KS, R Jundt, CB Ireland, MR Wasem, RA Stafford, and A Hunzinger. 2021. 2020 Atmospheric Radiation Measurement (ARM) Annual Report. Ed. by Kathryn Dorsey, U.S. Department of Energy. DOE/SC-ARM-20-020.

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