[nws-changes] 201103016: Fwd: Termination of ART-ADMIN NOTICE NOUS41 KWBC

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: [nws-changes] 201103016: Fwd: Termination of ART-ADMIN NOTICE NOUS41 KWBC
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Wed, 16 Mar 2011 11:49:33 -0600

-------- Original Message --------

530
NOUS41 KWBC 161716
PNSWSH

Technical Implementation Notice 11-08
National Weather Service Headquarters Washington DC
116 PM EDT Wed Mar 16, 2011

TO:       Subscribers:
          -Family of Services
          -NOAA Weather Wire Service
          -Emergency Managers Weather Information Network
          -NOAAPORT
          Other NWS Partners and Employees

FROM:     Kevin Schrab
          Chief, Observing Services Division
          Office of Climate, Water, and Weather Services

SUBJECT:  Third Quarter 2011 Dates for Termination of
          Automated Radiotheodolite Tracking (ART) and Radio
          Direction Finding Radiosondes (RDF) with Installation
          of Radiosonde Replacement Systems (RRS)

From April 25 through May 15, 2011, three Upper Air (UA) sites

are scheduled to receive RRS Upgrades. Specific dates are as
follows:

STATION NAME   WMO #      STN ID    OUTAGE DATES

CHUUK          91334      PTKK      25 Apr 2011
POHNPEI        91348      PTPN      05 May 2011
MAJURO         91376      PMKJ      16 May 2011

These UA sites may be out of service for as long as 10 days.
When the NWS UA observations resume, the RRS will be gathering
meteorological data from Global Positioning System (GPS)
radiosondes.

The NWS describes the RRS release point location with the
National Geodetic Survey (NGS) OPUS solution. This is a datum
combination that relies on North American Datum of 1983 (NAD83)
for latitude and longitude, whereas the release point elevation
is based on North American Vertical Datum 1988 (NAVD88) with the
GEOID03 model.  By contrast the GPS radiosonde flight
information of latitude and longitude and altitude will rely on
the world geodetic system of 1984 (WGS84) standard.

Parts of the UA coded messages will be significantly longer with
RRS conversion.  NWS has coordinated with its partners on the
longer length of these messages.

The format of the messages will be the same WMO format for coded
UA messages used with the MicroArt legacy system. The number of
levels in the coded messages will be two to three times greater
for the TTBB and TTDD.  As a result two categories of AWIPS text
products will increase in size:  SGL and ABV. The number of
levels in the TTAA, TTCC, PPBB and PPDD parts will be relatively
unchanged. These changes reflect updated coding practices and
higher resolution level selection criteria. The maximum size
limits of the parts of the coded messages are as follows:

     TTAA:   15 Levels
     TTCC:   10 Levels
     TTBB:  135 Levels
     TTDD:   40 Levels
     PPBB:   40 Levels
     PPDD:   40 Levels

In addition the 31313 message indicator associated with various
parts of the message will be included with each part of the
thermodynamic message parts.

For additional information on the message requirements, see WMO
306 Manual on Codes (International Codes):  Volume I.1 Part A -
Alphanumeric Codes and Volume II Regional Codes and National
Coding Practices.  Users can find information on the levels
selection criteria used in NWS coding software online at:

  http://www.ua.nws.noaa.gov

If you have questions or feedback, please contact:

  Ivan Navarro
  Engineering and Acquisition Branch (OPS11)
  National Weather Service
  Silver Spring, Maryland 20910
  301-713-1841 Ext. 123
  Ivan.Navarro@xxxxxxxx

National Technical Implementation notices are online:

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

$$
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