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Public Information Statement


NOUS41 KWBC 181445
PNSWSH

SERVICE CHANGE NOTICE 10-17 
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
945 AM EST MON MAR 8 2010

TO:       SUBSCRIBERS:
         -FAMILY OF SERVICES
         -NOAA WEATHER WIRE SERVICE
         -NOAAPORT
         -EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
         -OTHER NWS PARTNERS...USERS AND EMPLOYEES

FROM:    THERESE Z. PIERCE
         CHIEF...MARINE AND COASTAL SERVICES BRANCH

SUBJECT: CHANGE TO CODING OF HIGH DENSITY OBSERVATION /HDOB/
         MESSAGE FOR MISSING DATA: EFFECTIVE JULY 15 2010 

EFFECTIVE JULY 15 2010...THE CODING OF THE HDOB MESSAGE FOR MISSING 
DATA TRANSMITTED FROM NOAA AND AIR FORCE RECONNAISSANCE AIRCRAFT WILL 
CHANGE FROM 999 TO ///.  THIS CHANGE IS BEING MADE FOR HDOBS TO BE 
CONSISTENT WITH THE CODING OF MISSING DATA FOUND IN OTHER 
METEOROLOGICAL DATA MESSAGES.

IN ADVANCE OF THIS CHANGE...USERS OF HDOB MESSAGES MAY NEED TO MAKE 
CHANGES TO THEIR SOFTWARE TO CORRECTLY PROCESS THE NEW DATA FORMAT.

THERE WILL BE NO CHANGES TO WMO HEADINGS OR AWIPS IDS OF THE HDOB 
MESSAGES.

IF THERE ARE ANY CHANGES TO THE IMPLEMENTATION DATE... AN ADDITIONAL 
SERVICE CHANGE NOTICE WILL BE ISSUED AS EARLY AS POSSIBLE TO NOTIFY 
USERS.  FOR EXAMPLE IF THERE IS AN ACTIVE TROPICAL CYCLONE IN THE DAYS 
PRIOR TO JULY 15...OR TROPICAL DEVELOPMENT IS ANTICIPATED AROUND THIS 
DATE... A NEW IMPLEMENTATION DATE WILL BE PROVIDED.

THE OLD AND NEW HDOB MESSAGE FORMATS WILL BE PROVIDED IN THE 2010 
NATIONAL HURRICANE OPERATIONS PLAN /NHOP/ APPENDIX G. THE 2010 NHOP 
WILL BE AVAILABLE BY JUNE 1 2010 AT:

  http://www.ofcm.gov
                      
IF YOU HAVE ANY QUESTIONS...PLEASE CONTACT

  JOHN KUHN
  NATIONAL WEATHER SERVICE
  1325 EAST WEST HIGHWAY
  SILVER SPRING MARYLAND 20910
  301 713 1677 EXTENSION 121
  JOHN.F.KUHN@NOAA.GOV

NATIONAL SERVICE CHANGE NOTICES ARE ONLINE AT:

 http://www.weather.gov/os/notif.htm

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