NOUS41 KWBC 071930



Service Change Notice 16-11

National Weather Service Headquarters Washington DC

330 PM EDT Thu Apr 7 2016


TO: Subscribers:

-NOAA Weather Wire Service

-Emergency Managers Weather Information Network


-Other NWS partners and NWS employees


FROM: Eric Christensen

Acting Chief, Marine, Tropical, and Tsunami Services



SUBJECT: Use of Mixed-Case Letters in Select NWS National

Central Pacific Hurricane Center Products Effective

June 1, 2016


Effective Wednesday, June 1, 2016, the NWS will expand its

mixed-case text product suite to include select products (Table

1) issued by the Central Pacific Hurricane Center (CPHC). The

first issuance of the text products in Table 1, in mixed-case,

will be 1200 Coordinated Universal Time (UTC), or 2:00 AM Hawaii

Standard Time (HST), June 1, 2016.


Table 1: Operational CPHC Products in the Mixed-Case Text



Product Name WMO Header AWIPS ID

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

Tropical Weather Outlook ACPN50 PHFO TWOCP

(Central Pacific)


Tropical Cyclone Discussion WTPA41-45 PHFO TCDCP1-5

(Central Pacific)


Tropical Cyclone Public WTPA31-35 PHFO TCPCP1-5

Advisory (Central Pacific)

Tropical Cyclone Position WTPA61-65 PHFO TCUCP1-5

Update (Central Pacific)


Tropical Weather Summary ACPN60 PHFO TWSCP

(Central Pacific)


NWS began using mixed-case letters and the expanded

punctuation/character set experimentally in October 2010 and

operationally in May 2016. (Table 2):


Table 2: 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 { | } ~


These products will continue to be issued using mixed-case text

through the end of the 2016 Central Pacific Hurricane Season,

normally November 30; however, partners and users should be

aware these products may revert back to using all uppercase

letters at any time if the CPHC determines it to be necessary to

meet operational requirements.


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

to read and allow users to click on Internet links directly

rather than converting them to lowercase or mixed case.


For more information, please contact:


Tom Evans

Deputy Director

NOAA/NWS/Central Pacific Hurricane Center

Honolulu, Hawaii



National Service Change Notices are online at: