NOUS41 KWBC 161816 AAA



Service Change Notice 16-20: Amended

National Weather Service Headquarters Washington DC

1016 AM EDT Tue Aug 16 2016


TO:        Subscribers:

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network


           Other NWS partners and NWS employees


FROM:      Mark Tew

           Chief, Analysis and Mission Support Division


           Eli Jacks

           Chief, Forecast Services Division


SUBJECT:   Amended: Phase 2 Mixed-Case Text and Expanded

           95 Character ASCII Character Set Use in NWS Text

           Products Effective December 6, 2016


Amended to change the effective date to December 6, 2016


Effective Tuesday, December 6, 2016, the NWS will continue its

transition of text products to a mixed-case text format/

expanded 95 ASCII character set at all Weather Forecast Offices

(WFOs) with the following text products:


Product Name                   AWIPS ID*

------------                   --------

Tornado Warning                TORXXX

Severe Thunderstorm Warning    SVRXXX

Severe Weather Statement       SVSXXX

Flash Flood Warning            FFWXXX

Flood Warning                  FLWXXX

Flash Flood Statement          FFSXXX

Flood Statement                FLSXXX

Extreme Wind Warning           EWWXXX

Short Term Forecast            NOWXXX

Special Weather Statement      SPSXXX


* XXX is the WFO Three-Letter ID


NWS will not transition the Special Marine Warning (SMW) and

Marine Weather Statement (MWS) to mixed-case text at this time.

When these products are ready to transition, NWS will send

another Service Change Notice.


Samples of Watch, Warning and Advisory products are online in a

compressed file readable by standard decompression software:



and in a Word document:


None of the sample products shown were actually issued; these

products are shown for sample formatting purposes only.  If

weather conditions prevent any WFO from making this change on

December 6, 2016, the change to the mixed-case text format will

occur on the next suitable day.


This second phase roll-out of the mixed-case text format was

preceded by an initial phase that included mixed-case text for

the Area Forecast Discussion (AFD), local Public Information

Statement (PNS) and Regional Weather Summary (RWS) products on

May 11, 2016.


Most other NWS text products will be issued using mixed case by

January 2017.  NWS will issue a Service Change Notice (SCN) to

announce this transition with at least 30 days lead time. The

notice will include AWIPS product identifiers and actual

effective dates.


Partners and users of NWS text products should modify their

systems to accommodate mixed case and the expanded character

set. This change will make text products easier to read and

allow users to click on links directly rather than requiring

conversion to lowercase or mixed case.


If you have questions, please contact:


Art Thomas

NWS Digital and Graphical Support Branch

Silver Spring, MD, 20910


National Service Change Notices are online at: