NOUS41 KWBC 121515



Service Change Notice 12-26

National Weather Service Headquarters Washington DC

1115 AM EDT Thu Jul 12 2012


To:      Subscribers:

         -Family of Services

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network


         Other NWS partners and NWS employees


From:    Russell Schneider

         Director, Storm Prediction Center


Subject: General Thunderstorm Information Added to Storm

         Prediction Center (SPC) Day 3 Convective Outlook

         Effective September 25, 2012


Effective Tuesday, September 25, 2012, at approximately
1500 Coordinated Universal Time (UTC), the SPC will add general thunderstorm information to all SPC Day 3 Convective Outlooks. This includes changes to:


-National Digital Forecast Database (NDFD) products

-Points (PTS) product

-Redbook Graphic product


This change is for the Continental U.S. only and will not involve changes to World Meteorological Organization Headers or Advanced Weather Interactive Processing System IDs.


After this change, the SPC Day 3 Convective Outlook will contain the same information as the SPC Day 2 Convective Outlook, including a definition of the area of general thunderstorms along with the already existing defined area of risk of severe thunderstorms: Slight, Moderate or High.


A more detailed description of the SPC Convective Outlooks can be found at:


For more information, please contact:


   Steven Weiss

   NCEP Storm Prediction Center




   John Ferree

   Office of Climate Water and Weather Services


National Service Change Notices are online at: