NEXRAD Radar Operations Center - NWS WSR-88D

Radar Operations Center

NWS WSR-88D - Level II Event Data

Level II data are the digital radial base data (Reflectivity, Mean Radial Velocity, and Spectrum Width) and Dual-Polarization variables (Differential Reflectivity, Co-polar 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 is continuously transmitted and archived from all DOC, DoD and DOT WSR-88D and TDWR systems and are available via FTP download here.

The Interface Control Documents describing the WSR-88D RPG and TDWR SPG Level II data format is available by clicking here.

NWS WSR-88D Level II Data Collection and Distribution Network Information

View the Current Level II Data Flow from NWS		Download ARCHIVED Level II Data from NCDC NEXRAD Data Inventory		Visit the Level II Status pages at Weather.gov