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064
NOXX10 KWBC 231338
DATA MGT MESSAGE 09-98.11
CHANGES TO BUOY AND C-MAN PRODUCTS FROM THE NATIONAL DATA BUOY
CENTER
OCTOBER 1 SEVERAL CHANGES WILL TAKE PLACE CONCERNING DISTRIBUTION
OF MOORED BUOY AND C-MAN OBSERVATIONS FROM STATIONS OPERATED BY
THE NATIONAL DATA BUOY CENTER /NDBC/.
NDBC PRODUCTS WILL CONTAIN GROUPS OF MOORED BUOY AND C-MAN
OBSERVATIONS EVERY 5 MINUTES INSTEAD OF 4 TIMES AN HOUR. THIS WILL
NOT INCREASE THE NUMBER OF OBSERVATIONS TRANSMITTED. MOST STATIONS
STILL TRANSMIT 1 OBSERVATION PER HOUR. THIS CHANGE WILL IMPROVE
THE TIMELINESS OF DATA. USERS MAY NEED TO INCREASE THE NUMBER OF
PRODUCT VERSIONS RETAINED IN THEIR WORKSTATIONS TO MAINTAIN THE
SAME TIME HISTORY OF OBSERVATIONS.
3-HOURLY TRANSMISSIONS OF SPECTRAL WAVE DATA WILL STOP. THE WMO
HEADINGS ARE SXVX30 KWBC - SXVX39 KWBC. THE AFOS PIL HEADINGS ARE
NMCBSOPO-NMCBSOP7. MORE DETAILED SPECTRAL WAVE OBSERVATIONS ARE
TRANSMITTED MORE FREQUENTLY IN WMO FM-65 WAVEOB CODE. THESE ARE
AVAILABLE ON THE FRAME RELAY NETWORK FOR NWS FIELD OFFICES AND
FROM THE NWSTG FOR OTHER USERS. PC SOFTWARE TO DECODE AND PLOT
THESE OBSERVATIONS WAS DEVELOPED BY THE NWSFO IN SEATTLE
WASHINGTON AND IS AVAILABLE FROM THE SSD IN THE WESTERN REGION.
THE WMO HEADINGS FOR THE FM-65 MESSAGES ARE
SXVX40-43 KWBC SXVX45-49 KWBC
SXVX60-63 KWBC SXVX65-69 KWBC
FM-65 WAVEOB MESSAGES WILL BE RELEASED TWICE AN HOUR FOR STATIONS
REPORTING TWICE AN HOUR. THESE WERE PREVIOUSLY RELEASED ONLY ONCE
AN HOUR. FOR NON-CRITICAL APPLICATIONS REAL-TIME SPECTRAL WAVE
OBSERVATIONS AND PLOTS ARE AVAILABLE BY HTTP TO WWW.NDBC.NOAA.GOV
THE THRESHOLD FOR CODING CALM SEA STATE WILL CHANGE FROM A
SIGNIFICANT WAVE HEIGHT OF .25M TO A WAVE HEIGHT OF .15 M.
WIND GUSTS WILL ALWAYS BE TRANSMITTED REGARDLESS OF THE WIND
SPEED. BECAUSE OF ROUNDING IN LIGHT WINDS THE GUSTS WILL SOMETIMES
EQUAL THE SPEED.
THE 3-HOUR PRESSURE TENDENCY GROUP WILL ALWAYS BE INCLUDED IF THE
CURRENT OBSERVATION AND THE OBSERVATION THREE HOURS AGO CONTAIN
PRESSURE. THE PRESENT CODING SYSTEM REQUIRES THESE PRESSURE
MEASUREMENTS PLUS THE MEASUREMENTS TAKEN IN INTERMEDIATE HOURS.
THE WMO-RECOMMENDED ALGORITHM WILL CONTINUE TO USE ALL THE
PRESSURES IF THEY ARE AVAILABLE BUT A BACKUP METHOD WILL BE USED
IF ANY OF THE INTERMEDIATE PRESSURES ARE MISSING.
MORE ACCURATE LATITUDE AND LONGITUDE VALUES WILL BE USED. USERS
MAY SEE A DIFFERENCE IN SOME POSITIONS AFTER THE IMPLEMENTATION.
THIS WILL BE NOTED MORE IN THE FM 65 MESSAGES WHICH REPORT
POSITION IN DEGREES MINUTE AND SECONDS.
THE NDBC CONTACTS FOR THESE CHANGES ARE MR. DAVID GILHOUSEN
228-688-2840 AND MS. SALLIE NOLAN 228-688-1721.
THE E-MAIL ADDRESSES ARE DGILHOUSEN/AT-SYMBOL/NDBC.NOAA.GOV
AND SNOLAN/AT-SYMBOL/NDBC.NOAA.GOV .
THIS INFORMATION IS ALSO POSTED ON THE NWS SYSTEMS OPERATIONS
CENTER CHANGE NOTICES WEB PAGE. THE URL IS LISTED BELOW.
NOTE THE URL SHOULD BE TYPED IN ALL LOWER CASE.
HTTP TO WWW.NWS.NOAA.GOV/OSO/NOTICES/NOTICES.SHTML
IF YOU HAVE ANY QUESTIONS PLEASE CONTACT ONE OF THE DATA
MANAGERS LISTED BELOW.
FRED BRANSKI
SENIOR DATA MANAGER
PHONE 301-713-0864 EXTENSION 146
EMAIL FRED.BRANSKI/AT SYMBOL/NOAA.GOV
EMAIL ADDRESS SHOULD BE ALL LOWER CASE
TONI ELLIS
DATA MANAGER
PHONE 301-713-0864 EXTENSION 143
EMAIL TONI.ELLIS/AT SYMBOL/NOAA.GOV
EMAIL ADDRESS SHOULD BE ALL LOWER CASE
LLOYD IRVIN CHIEF
NETWORK MONITORING AND ANALYSIS BRANCH
SYSTEMS OPERATIONS CENTER
RTH WASHINGTON SENDS
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