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NOUS41 KWBC 221946
PNSWSH
Service Change Notice 13-55: Amended
National Weather Service Headquarters Washington DC
345 PM EDT Tue Sep 22 2013
TO: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
Other NWS Partners and NWS employees
FROM: Kevin McCarthy
Acting Director, Weather Prediction Center
SUBJECT: Amended: Application of Downscaling to WPC 5 km
Deterministic Quantitative Precipitation Forecasts
Effective October 23, 2013
Amended to change effective date to October 23, 2013, due to significant
computer challenges
Effective October 23, 2013, at 1800 UTC, the National Centers
for Environmental Predictions (NCEP) Weather Prediction Center
(WPC) will implement downscaling to 5 km resolution on all
deterministic quantitative precipitation forecasts. The change
is based on numerous requests and as part of continual product
improvement. The downscaling uses monthly PRISM data. Enhanced
product detail is most evident during the cool season in the
western United States, with lessor effects in the East.
No changes will be made to WMO headers. Grid file sizes will
remain comparable to current sizes.
WPC has developed graphical and gridded examples of 6-hour,
24-hour, and 168-hour deterministic downscaled QPF available at:
ftp://ftp.wpc.ncep.noaa.gov/downscaled_qpf_examples/
The Hurricane Sandy examples (sandy_) demonstrate results for a heavy precipitation event in the eastern continental United States. The U.S. western examples (westus_) show results for a period of heavy precipitation at the end of November 2012 into early December 2012. For more information, please contact: David Novak NOAA/NCEP/WPC College Park, MD 20740 301-683-1484 David.Novak@xxxxxxxx National Service Change Notices are online at: http://www.weather.gov/os/notif.htm$$
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