NOUS41 KWBC 291415



Service Change Notice 16-05

National Weather Service Headquarters, Washington, DC

1015 AM EST Mon Feb 29 2016


TO:        Subscribers:

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network


           -Other NWS partners and NWS employees


FROM:      Michelle Hawkins

           Acting Chief, Marine, Tropical, and Tsunami Services



SUBJECT:   Use of Mixed-case letters in select NWS National

           Hurricane Center Products effective May 15, 2016


Effective May 15, 2016, the NWS will expand its mixed-case text

Product Risk Reduction effort to include an additional product

(Table 1) issued by the National Hurricane Center (NHC) Tropical

Analysis and Forecast Branch (TAFB). The first issuance of the

mixed-case Tropical Weather Discussion (TWD) will be 1800 UTC, 

May 15, 2016, 2 pm Eastern Daylight Time (EDT). Products that

were issued in mixed case in 2014 and 2015 will continue to be

issued in mixed case (Table 2).


Table 1: NHC Additional Products 


Product Name                       WMO Header          AWIPS ID

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


Tropical Weather Discussion        AXNT20 KNHC         TWDAT



Tropical Weather Discussion        AXPZ20 KNHC         TWDEP

(Eastern Pacific)


Table 2: NHC Continued Products


Product Name                       WMO Header          AWIPS ID

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


Tropical Cyclone Public            WTNT31-35 KNHC      TCPAT1-5

 Advisory (Atlantic)


Tropical Cyclone Public            WTPZ31-35 KNHC      TCPEP1-5

 Advisory (Eastern Pacific)


Tropical Cyclone Update            WTNT61-65 KNHC      TCUAT1-5



Tropical Cyclone Update            WTPZ61-65 KNHC      TCUEP1-5

 (Eastern Pacific)


Tropical Weather Summary           ABNT30 KNHC         TWSAT



Tropical Weather Summary           ABPZ30 KNHC         TWSEP

 (Eastern Pacific)


Tropical Weather Outlook           ABNT20 KNHC         TWOAT



Tropical Weather Outlook           ABPZ20 KNHC         TWOEP

 (Eastern Pacific)


Tropical Cyclone Discussion        WTNT41-45 KNHC      TCDAT1-5



Tropical Cyclone Discussion        WTPZ41-45 KNHC      TCDEP1-5

 (Eastern Pacific)


This expansion in the number of available mixed-case text

products is a continuation of the risk-reduction effort which

began in August 2010.  At that time, NWS began using mixed-case

letters and the expanded punctuation/character set (Table 3):


Table 3:  Allowed Mixed Case Character Set

"space" ! " # $ % & ' ( ) * + , - . /

0 1 2 3 4 5 6 7 8 9 : ; < = > ?

@ A B C D E F G H I J K L M N O

P Q R S T U V W X Y Z [ \ ] ^ _

` a b c d e f g h i j k l m n o

p q r s t u v w x y z { | } ~


Use of mixed-case letters in text products will make them easier

to read and allow users to click on links directly

rather than converting them to lower or mixed case.  Additional

punctuation and other characters that are part of the

international reference Alphabet No. 5 will also be included as



For more information, please contact:


Hugh Cobb

Chief, Tropical Analysis and Forecast Branch


Telephone: (305) 229-4454


National Public Information Notices are online at: