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Radar Operations Center
NEXRAD and TDWR Radar Locations and Coverage
Maps, below, show existing radar locations and full volumetric coverage for all operational NEXRAD WSR-88D and TDWR sites. Beam heights were calculated using a standard atmospheric refractive index of 1.21 and the Half-Power Beamwidth. Associated terrain data were publicly available through USGS.
- A full volume of WSR-88D data includes all standard elevation angles from VCP 12 starting with 0.5 degrees going through 19.5 degrees out to 300 km in range.
- Calculations consider:
- Center-of-Beam (COB) and Bottom-of-Beam (BOB) heights
- Mean Sea-Level (MSL) from the ground to the top of the radar tower; from the top of the tower to the radar feedhorn (where energy is transmitted and received); height of the MSL terrain elevation at the base of the radar site tower.
- The Above Ground Level (AGL) height at a given range is determined by subtracting out the associated MSL terrain elevation at the location.
- COB and BOB heights are found for each angle at each range bin and compared to heights defined in feet (less than or up to a specific height). Range bins which meet the requirement are included in the coverage map (for the specified level).
- BOB maps are generated as they are the first level above the ground where radar power returns are visible.
- Locations using a Base tilt have the additional coverage included. Refer to the latest Interface Control Document for the RDA/RPG for more details on elevation angles and Base Tilts.
- A full volume of TDWR data includes all site-specific operational angles out to 230 km in range.
Disclaimer: These data are current as of the Version date listed below. At this time, we cannot support requests for customized shapefiles, modifications to existing files, or updates beyond what is currently available. Use at your own risk.
Version: 20241101
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