NWS WSR-88D Level II Data Collection and Distribution Network Information
|     View the Current Levell II Data Flow from     NWS
||Download ARCHIVED Level II Data from NCDC NEXRAD Data Inventory
|(Click image to visit site)
||(Click image to download)
What are Level II data?
Level II data are the digital radial base data (Reflectivity, Mean Radial Velocity, and Spectrum Width) and Dual Polarization variables
(Differential Reflectivity, Correlation Coefficient, and Differential Phase) output from the signal processor in the Radar Data Acquisition unit.
The output also includes status information required to properly interpret the data (e.g., information on synchronization, calibration, date, time,
antenna position, Nyquist velocity, and operational mode). Level II data are used for many purposes including: support of operations, maintenance and
developmental activities at the ROC; activities directed toward algorithm and product improvement; research by universities; and private sector
uses/applications. The Level II data are sent to the National Centers for Environmental Information by the NWS WSR-88D National Level II (NL2)
system. Level II data are continuously transmitted and archived from all DOC, DoD and DOT WSR-88D systems and are available via FTP download
(http://www.ncdc.noaa.gov/nexradinv/choosesite.jsp). The interface control document describing
the Level II format (ICD For Archive II/User – Build 12.0) is available at: https://www.roc.noaa.gov/WSR88D/BuildInfo/Files.aspx
Eight WSR-88D sites (remaining DoD CONUS sites) now scheduled to be added to the
NWS WSR-88D Level II Data Collection, Distribution, and Archive network 2013.
Click here to see Technical Implementation Notice 13-37.