Public Information Statement
Issued by NWS National HQ

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
NOUS41 KWBC 281502

Public Information Notice
National Weather Service Headquarters Washington DC
1105 AM EDT Fri Aug 28 2015

To:       Subscribers:
          - Family of Services
          - NOAA Weather Wire Service
          - Emergency Managers Weather Information Network
          - NOAAPORT
          Other NWS partners and NWS employees

From:     Mark Tew
          Acting Chief, Analysis and Mission Support Division

Subject:  Soliciting Comments on an Experimental Precipitation
          Potential Index to be Added to the National Digital
          Forecast Database (NDFD) for the Conterminous United
          States (CONUS) from September 29, 2015, through
          December 31. 2015

Effective Tuesday, September 29, 2015, at 1400 Coordinated
Universal Time (UTC), through December 31, 2015, NWS will be
accepting comments on an experimental Precipitation Potential
Index (PPI) in the National Digital Forecast Database:

The experimental PPI will be available in the Conterminous United
States (CONUS) for forecast days 1-3 at 1 hour temporal
resolution for the first 36 hours from NDFD issuance time, and at
3 hour temporal resolution after the first 36 hours through
forecast day 3.

PPI provides greater detail regarding precipitation timing than
currently is available from NDFD 12 hour Probability of
Precipitation forecasts.  More information regarding PPI is
available in the Product Description Document (PDD) in the online
catalog of experimental NWS products and services.

To access NDFD CONUS grids for Days 1-3, use the following URLs:

The PPI file will have a World Meteorological Organization (WMO)
super heading of:

And a file name of:

NDFD forecasts can be viewed via the NDFD map viewer at:

General information on accessing and using NDFD elements is
online at:

If September 29 is a critical weather day, this implementation
will be postponed. Partners and users will be notified of that
decision via another Public Information Notice and a new
implementation date will be established.

After the comment period, the NWS will evaluate any comments and
decide whether to proceed with operational implementation of the
in the NDFD.

For general questions regarding NDFD data, please email:

For technical questions regarding NDFD data, please contact:

  David Ruth
  Chief, Digital Forecast Services Branch
  NOAA/NWS Office of Science and Technology Integration
  Silver Spring, Maryland 20910

For questions regarding this notice, please contact:

  Andy Horvitz
  NWS Digital and Graphical Information Support Branch
  Silver Spring, Maryland 20910

NDFD Public Information Notices are online at:

National Public Information Notices are online at:

$$ is the U.S. government's official web portal to all federal, state and local government web resources and services.