981013: FOS/NOAAPORT-NDBC-Part 2-NOUS (fwd)

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: 981013: FOS/NOAAPORT-NDBC-Part 2-NOUS (fwd)
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Tue, 13 Oct 1998 07:21:50 -0600 (MDT)

989 
NOUS40 KWBC 061250
FOS/NOAAPORT NOTICE NO. 1350       OCTOBER 6  1998
PART 2 OF A 2 PART MESSAGE

ATTENTION    FAMILY OF SERVICES SUBSCRIBERS
             NOAAPORT USERS

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 THREE-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  MINUTES
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 NDBC.NOAA.GOV AND
SNOLAN NDBC.NOAA.GOV.
END
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