Service Change Notice 18-09

National Weather Service Headquarters Silver Spring MD

935 AM EST Fri Jan 26 2018


To:       Subscribers:

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS partners and NWS employees


From:     Kevin Stone

          Acting Chief, Aviation and Space Weather Services



Subject:  Termination of the National Convective Weather

          Diagnostic and Forecast Product (NCWD/NCWF) on

          March 31, 2018


On March 31, 2018, the NWS will terminate the National

Convective Weather Diagnostic and Forecast Product (NCWD/NCWF).


The NCWF is an automatically generated depiction of current

convection and extrapolated significant current convection. It

is a supplement to, but does not substitute for the report and

forecast information contained in convective forecasts. The NWS

Aviation Weather Center (AWC) updates the NCWD/F based on input

from the Next Generation Weather Radar (NEXRAD) and cloud-to-

ground (CG) lightning data.  The NCWF is updated every 5 minutes

using the most current available data from the current NEXRAD

Composites delivered by Unisys and CG lightning.


The NCWD and NCWF product are currently available online

visually and through NOAAPort using the headers WMO ZDIAT98





Due to radar composite data termination and outdated computing

servers presenting IT security risks, this product has become

unsupportable and scientifically invalid.


Alternatives to the NCWD and NCWF include the Multi-Radar/

Multi-Sensor System (MRMS) and the NWS AutoNowcaster available

through the NWS. Both are available at:


If you have any questions or comments, please contact:


Brian Pettegrew, PhD.

AWC Aviation Support Branch

Kansas City, MO



National Service Change Notices are online at: