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NCEP Home > NCO Home > Systems Integration Branch > Decoders > DCMETR Decoder

Aviation Weather Decoder

IMPORTANT: If you haven't already done so, be sure to read the overview document that contains information relevant to all of the NCEP decoders!

The NCEP Aviation Weather Decoder parses reports of the following formats into the NCEP Decoder Interface Format:

  • SAO - Surface Aviation Observations, Federal Meteorological Handbook Number 1 (FMH-1), FCM-H2-1994, August 1994.

Known Deficiencies:

    • Supplementary information:
      • Recent weather phenomena of operational significance (Group REw'w') are not decoded.
      • Wind shear in the lower layers (Group WS RWYDRDR or Group WS ALL RWY) are currently not decoded.
      • State of the runway (RRRRERCReReRBRBR) is not decoded.
    • Trend forecast fields are currently not decoded.
    • Remarks fields (Group RMK ......):
      • Fields from stations in countries other than Mexico are currently being checked for possible decoding, but this decoder does not decode every field following the RMK group.
      • Fields from Mexican stations are checked only for the presence of the sea-level pressure (SLP) field.
  • For SAO:
    • Observation types of Record Special ('RS'), Special ('SP'), Urgent Special ('USP'), and Routine Delayed Report ('RTD') are not decoded.
    • Sky conditions of 'CLR BLO XXX' are not decoded.
    • Visibilities preceded by a '+' or trailed by a '+' are not decoded.
    • Squall winds (those prefixed by a 'Q') are not decoded.
    • In the Remarks section of the report, the only parameters which are decoded are:
      • Synoptic cloud types (CL, CM, CH);
      • Depth of snow on ground and water equivalent of snow depth;
      • 3-hr pressure change and tendency;
      • 3-hr, 6-hr, and/or 24-hr precipitation amounts;
      • Maximum and minimum temperatures;
      • Minutes of sunshine.

Related Documents:

Change History Log:

Version Date Summary of Changes
1.1 8/10/2000 Initial version
1.2 2/6/2001 Version 1.2 Changes
1.3 11/6/2001 Version 1.3 Changes
1.4 5/17/2004 Version 1.4 Changes
1.5 2/17/2006 Version 1.5 Changes


The latest version of the decoder can be downloaded and utilized free of charge, subject to the usual NWS disclaimer. You may click here to download a copy of the decoder software. If you wish to be included on our "decoders-announce" mailing list, please visit our Decoder Announcements mailing list site to subscribe yourself. This list is our way of informing our users whenever we make changes or updates to our software.


[Mailbox]Questions? Comments?
Send mail to Decoder Helpdesk.

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Page last modified: Wednesday, 17-May-2006 15:15:08 UTC