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-------- Original Message -------- 147 NOUS41 KWBC 211159 PNSWSH Technical Implementation Notice 13-14, Corrected National Weather Service Headquarters Washington DC 758 AM EDT Jun 21 2013TO: 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: Corrected: August 20, 2013, the first of three Alaska
Upper Air Sites will Terminate its Automated
Radiotheodolite Tracking (ART) and Radio Direction
Finding Radiosondes (RDF) upon Installation of the
Radiosonde Replacement System (RRS)
Corrected for proper WMO Numbers for McGrath and Cold Bay and to
increment TIN to 13-14.
Three Upper Air (UA) sites in Alaska are scheduled to begin RRS
service on or after August 20, 2013.
STATION NAME WMO # STN ID RRS START ON/ABOUT
KOTZEBUE 70133 PAOT 20 Aug 2013
MCGRATH 70231 PAMC 30 Aug 2013
COLD BAY 70316 PACD 24 Sep 2013
These UA sites may be out of service for as long as 10 days.
The NWS UA observations will gather meteorological data from
Global Positioning System (GPS) radiosondes of a new type, the
LMS-6. The assigned equipment code is 48208. The leading 4
indicates a correction is applied for solar and infrared
exposure. The 08 suffix indicates automatic satellite
navigation. This code appears immediately after the heading,
31313 in the TTAA, TTBB, TTCC, and TTDD messages.
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 please
see the 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:
Neal Dipasquale
Acting Director, Field Systems Operations Center (OPS21)
National Weather Service
Silver Spring, Maryland 20910
301-713-0039 Ext. 155
Neal.Dipasquale@xxxxxxxx
NWS National Technical Implementation notices are online at:
http://www.weather.gov/os/notif.htm
$$
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