NOUS41 KWBC 291225 AAA



Service Change Notice 17-12 Updated

National Weather Service Headquarters Silver Spring MD

825 AM EDT Wed Mar 29 2017


To:      Subscribers:

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network


         Other NWS partners and NWS employees


From:    David Novak

         Director, Weather Prediction Center


Subject: Updated: Resolution upgrade for WPC Quantitative

         Precipitation Forecasts for CONUS effective

         April 3, 2017


Updated effective date changed to Monday, April 3, 2017 due to

critical weather day


Effective Monday, April 3, 2017, beginning with the 1800

Coordinated Universal Time (UTC) issuance, the National Centers

for Environmental Prediction (NCEP) Weather Prediction Center

(WPC) will change the Quantitative Precipitation Forecast (QPF)

products as follows:


- The 5-km resolution QPF products will be upgraded to a 2.5-km

resolution grid on an extended domain which fully covers the

Northwest River Forecast Center basin.

- The new 2.5-km resolution data will replace the existing 5-km


- The 2.5-km products will use the same WMO headers as the

current 5-km products.

- No changes will be made to the existing 10-km QPF products.


All products will be disseminated on the Satellite Broadcast

Network (SBN), NOAAPORT, and an ftp server in GRIB2 format.


Test grids for the 2.5-km products will be available in GRIB2

format with WMO headers on or about Monday, February 6, 2017, on

the WPC's ftp server:


A listing of the WMO headers affected is given in Table 1 below.


Table 1: Products affected by this Change Notice

Product                   WMO Header     

-------                 -----------    

6-hr QPF F006             LEMB98 KWNH

6-hr QPF F012             LEMC98 KWNH   

6-hr QPF F018             LEMD98 KWNH

6-hr QPF F024             LEME98 KWNH

6-hr QPF F030             LEMF98 KWNH

6-hr QPF F036             LEMG98 KWNH

6-hr QPF F042             LEMH98 KWNH

6-hr QPF F048             LEMI98 KWNH

6-hr QPF F054             MEMM98 KWNH

6-hr QPF F060             LEMJ98 KWNH

6-hr QPF F066             MEMN98 KWNH

6-hr QPF F072             LEMK98 KWNH

6-hr QPF F078             MEMT98 KWNH

6-hr QPF F084             LEML98 KWNH

6-hr QPF F090             MEMU98 KWNH

6-hr QPF F096             LEMM98 KWNH

6-hr QPF F102             MEMV98 KWNH

6-hr QPF F108             LEMN98 KWNH

6-hr QPF F114             MEMW98 KWNH

6-hr QPF F120             LEMO98 KWNH    

6-hr QPF F126             MEMX98 KWNH

6-hr QPF F132             LEMP98 KWNH

6-hr QPF F138             MEMX98 KWNH

6-hr QPF F144             LEMP98 KWNH

6-hr QPF F150             MEMY98 KWNH

6-hr QPF F156             LEMQ98 KWNH

6-hr QPF F162             MEMY98 KWNH

6-hr QPF F168             LEMQ98 KWNH

48-hr QPF F120            LEMO98 KWNH

48-hr QPF F168            LEMR98 KWNH

120-hr QPF F120           LEMO98 KWNH

168-hr QPF F168           LEMR98 KWNH


For questions regarding the implementation please contact:

  James A. Nelson

  WPC/College Park, Maryland



National Service Change Notices are online at: