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NOUS41 KWBC 291230 AAA

Service Change Notice 17-12 Updated
National Weather Service Headquarters Silver Spring MD
830 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: is the U.S. government's official web portal to all federal, state and local government web resources and services.