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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

†††††††† -NOAAPORT

†††††††† 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 Predictionís

(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 precipitationF66†††††††††† 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:



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