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NOUS41 KWBC 241330

Service Change Notice 14-28
National Weather Service Headquarters Washington DC
930 AM EDT Thu Apr 24 2014

TO:      Subscribers:
         -Family of Services
         -NOAA Weather Wire Service
         -Emergency Managers Weather Information Network
         Other NWS Partners and NWS employees

FROM:    Kevin McCarthy
         Acting Director, Weather Prediction Center

SUBJECT: Increase in Horizontal Resolution of Weather Prediction
         Center (WPC) Day 4-7 Gridded Guidance and Addition of
         Day 3 for CONUS Effective July 8, 2014

Effective Tuesday, July 8, 2014, at 1500 Coordinated Universal
Time (UTC), the National Centers for Environmental Predictions
(NCEP) WPC will increase the resolution of Day 4-7 gridded
sensible weather guidance products over the CONUS from 5 km to
2.5 km. This change applies to the following elements:

  maximum temperature
  minimum temperature
  dew point
  wind speed
  wind direction
  probability of precipitation
  sky cover
  weather type

The 2.5 km products will be issued on the same twice daily
schedule using the same WMO headers as the current 5 km products.
After this change, the 5 km products will no longer be available.
Users will see an increase in file size, from approximately 200K
to approximately 800K for each element at each forecast hour.
These changes are being made to meet National Digital Forecast
Database (NDFD) requirements.

Additionally, these same elements will be provided twice daily at
the Day 3 forecast projection over the CONUS with the following
WMO headers:

Element                   Forecast Hour     WMO Header
-------                   -------------     ----------
Minimum temperature           F72           LHUD12 KWBN

Maximum temperature           F84           LGUD12 KWBN

Probability of precipitation  F66           LDUD00 KWBN
                              F72           LDUD06 KWBN
                              F78           LDUD12 KWBN
                              F84           LDUD18 KWBN

Sky cover                     F66           LAUD00 KWBN
                              F72           LAUD06 KWBN
                              F78           LAUD12 KWBN
                              F84           LAUD18 KWBN

Wind direction                F66           LBUD00 KWBN
                              F72           LBUD06 KWBN
                              F78           LBUD12 KWBN
                              F84           LBUD18 KWBN

Wind speed                    F66           LCUD00 KWBN
                              F72           LCUD06 KWBN
                              F78           LCUD12 KWBN
                              F84           LCUD18 KWBN

Dew point                     F66           LFUD00 KWBN
                              F72           LFUD06 KWBN
                              F78           LFUD12 KWBN
                              F84           LFUD18 KWBN

Weather type                  F66           LDUD00 KWBN
                              F72           LDUD06 KWBN
                              F78           LDUD12 KWBN
                              F84           LDUD18 KWBN

For more information, please contact:

National Service Change Notices are online at:

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