NOUS41 KWBC 231805

PNSWSH

 

Service Change Notice 18-22

National Weather Service Headquarters Washington DC

205 PM EST Fri Feb 23 2018

 

To:       Subscribers:

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network

          -NOAAPORT

          Other NWS Partners, Users and Employees

 

From:     David Novak

          Director, Weather Prediction Center (WPC)

 

Subject:  Experimental grids for the 0.25 inch (~6 mm) threshold

          of the Day 4-7 Winter Weather Outlook will become an

          operational element in the NDFD for the CONUS

          effective on or about March 27, 2018 

 

Effective on or about March 27, 2018, the experimental grids for

the 0.25 inch (~6 mm) threshold of the Day 4-7 Winter Weather

Outlook will become an operational element in the National

Digital Forecast Database (NDFD) for the Continental United

States.

 

The Day 4-7 Winter Weather Outlook, produced by the NWS National

Centers for Environmental Prediction (NCEP) Weather Prediction

Center (WPC), is a forecast depicting the probability of winter

precipitation (snow/sleet) exceeding 0.25 inches (~6 mm) water

equivalent over a 24-hour period (Valid Time 12Z-12Z).

 

The product is comprised of 4 separate grids containing the

forecast for Days 4, 5, 6 and 7. The product is updated daily at

approximately 0900 UTC and 1930 UTC.

 

More details on the Day 4-7 Winter Weather Outlook product, as

well as its technical description and scientific basis, are

available in the Product Description Document.

 

https://nws.weather.gov/products/PDD/Day%204-7%20Winter%20Weather%20Outlook%20into%20NDFD%20PDD.pdf

 

These grids will be available from NDFD in the following

standard methods:

 

-Gridded Binary version 2 (GRIB2) files via Hypertext Transfer

 Protocol (HTTP) and File Transfer Protocol (FTP)

-Extensible Markup Language (XML) via Simple Object Access

 Protocol (SOAP)

-Graphics via Web browser

 

Users who pull NDFD elements in GRIB2 format via the

Internet may need to update their procedures and scripts to

access this new element.

 

The new files will be available for download at the following

links effective on or about March 27, 2018:

 

GRIB2 files:

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.c

onus/VP.004-007/ds.p24less0025.bin

 

http://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.

conus/VP.004-007/ds.p24less0025.bin

 

Graphics and XML services for the grids will become available

Within 30 days of the release of the GRIB2 file into the NDFD.

 

NDFD online graphics:

http://digital.weather.gov/

 

XML SOAP service:

http://preview.weather.gov/xml/

 

Information on accessing and using NDFD elements is online at:

https://www.weather.gov/mdl/ndfd_data_grid

 

For general questions regarding NDFD data, please email:

nws.ndfd@noaa.gov

 

For technical questions regarding NDFD data please contact:

 

  David Ruth

  NWS/STI/Digital Forecast Services Branch

  National Weather Service Headquarters

  Silver Spring, Maryland

  301-427-9457

  David.Ruth@noaa.gov

 

For questions regarding this notice, please contact:

 

  James Nelson

  NWS/WPC/Development and Training Branch

  National Centers for Environmental Prediction

  College Park, MD

  301-683-1493

  James.A.Nelson@noaa.gov

 

NWS Service Change Notices are online at:

 

  http://www.weather.gov/os/notif.htm

 

NNNN