NOUS41 KWBC 271125



Service Change Notice 16-56

National Weather Service Headquarters Washington DC

725 AM EST Tue Dec 27 2016


To:       Subscribers:

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network


         Other NWS partners and employees


From:    Mark Tew

         Chief, Analysis and Mission Support Division


Subject: NWS to merge Technical Implementation Notices (TIN)

         with Service Change Notices (SCN) and use Update in

         lieu of Corrected and Amended in notices effective

         January 1, 2017


Effective January 1, 2017, NWS will discontinue issuing new

TINs. The subject matter previously included in TINs will be

issued via Service Change Notices because there is no longer

any significant difference between the two categories. NWS will

continue to issue updates to previously issued TINs as



In addition, NWS will use a new Update notice category instead

of Amended (AAx, etc.) and Corrected (CCx, etc.) notices.  The

Update category will continue to use AAx, etc., in accordance

with NWSI 10-1701, Text Product Formats and Codes, but use the

word "update" in the notice instead of "amended" or

"corrected." This change will make choosing between categories



These changes are detailed in NWSI 10-1805, National Public

Information Statements and Service Change Notices, which

includes other minor changes. The full document is online

(after January 1, 2017) at:


For more information, please contact:

Art Thomas or Melody Magnus


National Service Change Notices are online at: