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Technical Implementation Notice 15-49: Updated

National Weather Service Headquarters Washington DC

345 PM EST Thu Feb 2 2017


To:         Subscribers

            -NOAA Weather Wire Service

            -Emergency Managers Weather Information Network


            Other NWS Partners and Employees


From:       Terrance J. Clark

            Director, WSR-88D Radar Operations Center


Subject:    Updated: WSR-88D Volume Coverage Pattern Changes

            tentatively scheduled to deploy in Mid-October 2017


Amended scheduled deployment date to mid-October 2017.


In WSR-88D Radar Data Acquisition (RDA)/Radar Product Generation

(RPG) Software Build 18.0, 4 current Volume Coverage Patterns

(VCPs) will be eliminated. These VCPs are 11, 211, 21 and 221.

They will be replaced with a new pattern, VCP 215. VCPs 12, 212,

121, 31 and 32 will remain in the system. Build 18.0 Beta Test

is tentatively scheduled for mid-October 2017, with full

deployment following during the winter.


VCP 215 will include the same elevation angles as VCPs 12/212

below 10 degrees, and the same angles as VCPs 11/211 above 

10 degrees. The data quality will be comparable to VCP 21, and

the completion time of VCP 215 will be approximately 6 minutes.

AVSET and one SAILS cut will be operator selectable with VCP

215. VCP 215 will be ideal for general weather surveillance and

during light precipitation events.


In addition, another new VCP will be introduced for use during

clear-air or winter precipitation. VCP 35 will include the same

elevation angles up to 6.4 degrees as those used by VCPs

12/212/215. VCP 35 will complete in approximately 7 minutes and

one SAILS cut will be operator selectable.


These VCPs share a common set of elevation angles with severe

weather VCPs 12/212, increase the elevation coverage over the

current suite of routine surveillance patterns, and provide SZ-2

Doppler processing for the split cut elevations.

More information on the VCP changes is available:


Sample data sets of VCP 35 and VCP 215 are available on the

Radar Operations Center's New Technologies website:


For more information, contact:


     Jessica Schultz

     NWS Radar Focal Point

     Radar Operations Center


National Public Information Statements are online at: