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-------- Original Message -------- 909 NOUS41 KWBC 071426 PNSWSH Technical Implementation Notice 13-13 National Weather Service Headquarters Washington DC 1025 PM EDT Fri Jun 7 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: Three Alaska Sites to Terminate their Automated
Radiotheodolite Tracking (ART) and Radio Direction
Finding Radiosondes (RDF) upon Installation of the
Radiosonde Replacement System (RRS) Starting
August 20, 2013
Three Upper Air (UA) sites in Alaska are scheduled to begin RRS
service in the next four months in 2013.
STATION NAME WMO # STN ID RRS START ON/ABOUT
KOTZEBUE 70133 PAOT 20 Aug 2013
MCGRATH 70316 PAMC 30 Aug 2013
COLD BAY 70350 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; 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, the SGL and ABV categories of
AWIPS text products will increase in size. 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 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
NWS Acting Director, Field Systems Operations Center
Silver Spring, Maryland
301-713-0039 Ext. 155
Neal.Dipasquale@xxxxxxxx
NWS National Technical Implementation notices are online:
http://www.weather.gov/os/notif.htm
$$
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