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*WMO documentation on METAR format*METAR Study Guide — approved by the National Weather Services Directorate of Environment Canada*Wunderground METAR Tutorial*METARreader.com online decoder*metarchecker.com decoded metar reports;Software libraries*Perl modules for parsing METAR reports at the CPAN site*PhpWeather is a PHP application (with a GNU General Public License) that parses METAR reports.