NOUS41 KWBC 251510

PNSWSH

Service Change Notice 11-27

National Weather Service Headquarters Washington DC

1110 AM EDT Tue Jul 26 2011

TO: Subscribers:

-Family of Services

-NOAA Weather Wire Service

-Emergency Managers Weather Information Network

-NOAAPORT

Other NWS partners and NWS employees

FROM: James E. Hoke

Director Hydrometeorological Prediction Center

SUBJECT: Enhancements to Hydrometeorological Prediction Center
  Medium Range Weather Grids over CONUS Effective 
 October 11 2011
 

Effective Tuesday, October 11, 2011, the National Centers
for Environmental Prediction’s (NCEP) Hydrometeorological Prediction Center (HPC) will distribute enhanced CONUS medium range (days 4 through 7) weather grids. The grids have been enhanced to better align with National Digital Forecast Database (NDFD) requirements.

In particular the weather grid temporal resolution has been

increased to 6 hours from 12 hours, additional qualifiers (slight chance, chance) have been added, and the weather type algorithm has been improved to better take into account vertical

temperature profiles. No weather is shown where the Probability

of Precipitation (PoP) is less than 15%.

Graphical representations of the products are online at:

http://origin.hpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html

More details are online at:

http://origin.hpc.ncep.noaa.gov/5km_grids/medr_5km_methodology_newparms.pdf

If you have questions or feedback, please contact:

Ed Danaher

edwin.danaher@noaa.gov

301-763-8000 Ext 7354

National Service Change Notices are online at:

http://www.weather.gov/os/notif.htm

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