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U.S. Airports (accepts ICAO/FAA/IATA codes) http://www.airnav.com/airports/ CWOP (accepts ICAO/SYNOP/CMAN/BUOY codes) https://weather.gladstonefamily.net/cgi-bin/wxsite.pl?&Get+information=Get+information Great Circle (accepts ICAO/FAA/IATA codes) http://gc.kls2.com/cgi-bin/gclookup Canada AUTO sites not sent in METAR format (XML format, scroll down to "latest") https://dd.weather.gc.ca/observations/swob-ml/ NCEP METAR Station List (not all listed send METARs) https://www.nco.ncep.noaa.gov/pmb/codes/nwprod/decoders/decod_shared/dictionaries/metar.tbl NDBC (for CMAN/BUOY/other marine sites) https://www.ndbc.noaa.gov/ NDBC list of active marine stations (XML format) https://www.ndbc.noaa.gov/activestations.xml Gulf of Mexico platform AWOS (search for "AWOS") http://hsac.org/library WMO OSCAR/SURFACE (SYNOPs) https://oscar.wmo.int/surface/#/ WMO Pub. 9, Vol. A legacy format (SYNOPs) https://oscar.wmo.int/oscar/vola/vola_legacy_report.txt Boris
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