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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 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@noaa.gov
National Technical Implementation notices are online:
http://www.weather.gov/os/notif.htm
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