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They may carry the same underlying official observation and are not independent observations."},"meta":{"station":"LIMC","snapshotAt":"2026-11-10T17:48:45.891Z","servedAt":"2026-11-10T17:48:46.624Z","cache":{"status":"persistent","ageSeconds":0.733,"revalidating":false}},"data":{"station":{"icao":"LIMC","name":"Milan Malpensa Airport","country":"Italy"},"observation":{"observedAt":"2026-11-10T17:20:00.000Z","observedAtBasis":"Latest observation time across available source paths","reportKind":"METAR","flags":{"automatic":false,"correction":false,"nil":false},"canonicalVariants":[{"canonicalTac":"LIMC 101720Z VRB01KT 8000 NSC 09/06 Q1012 NOSIG","sourcePathIds":["awc","met_norway","nws_tgftp"]}]},"integrity":{"state":"aligned","summary":"All available paths show the same observation time and canonical TAC content.","availablePathCount":3,"expectedPathCount":3,"missingPathIds":[],"undatedPathIds":[],"laggingPathIds":[],"observationTimeAligned":true,"canonicalContentAligned":true,"variantCount":1,"tokenDifferences":[],"comparisonBasis":"Canonical TAC content and observation times in the current Terminal Weather fetch snapshot."},"timestamps":{"observation":{"value":"2026-11-10T17:20:00.000Z","provenance":"Latest compared report observation time across available source paths"},"terminalWeather":{"value":"2026-11-10T17:48:45.891Z","provenance":"Terminal Weather fetch completion"}},"representations":[{"sourcePathId":"awc","available":true,"rawTac":"METAR LIMC 101720Z VRB01KT 8000 NSC 09/06 Q1012 NOSIG","canonicalTac":"LIMC 101720Z VRB01KT 8000 NSC 09/06 Q1012 NOSIG","fingerprint":{"algorithm":"SHA-256","value":"8ffa743738c492640a71df63e6b36a347c1bfcd89e5a37bcc08f8a52507348ae"},"observedAt":"2026-11-10T17:20:00.000Z","reportKind":"METAR","flags":{"automatic":false,"correction":false,"nil":false}},{"sourcePathId":"met_norway","available":true,"rawTac":"LIMC 101720Z VRB01KT 8000 NSC 09/06 Q1012 NOSIG=","canonicalTac":"LIMC 101720Z VRB01KT 8000 NSC 09/06 Q1012 NOSIG","fingerprint":{"algorithm":"SHA-256","value":"99bbc8762a3cd3f9734c1d86c2524d8d1f2b74b9799b5449a7787b1f226899e0"},"observedAt":"2026-11-10T17:20:00.000Z","reportKind":"METAR","flags":{"automatic":false,"correction":false,"nil":false}},{"sourcePathId":"nws_tgftp","available":true,"rawTac":"LIMC 101720Z VRB01KT 8000 NSC 09/06 Q1012 NOSIG","canonicalTac":"LIMC 101720Z VRB01KT 8000 NSC 09/06 Q1012 NOSIG","fingerprint":{"algorithm":"SHA-256","value":"758648adc4a4d8fe58dfd15bfe4b46791a49ef91cf211cc0f6399c0af080df4d"},"observedAt":"2026-11-10T17:20:00.000Z","reportKind":"METAR","flags":{"automatic":false,"correction":false,"nil":false}}],"sourcePaths":[{"id":"awc","name":"Aviation Weather Center Data API","organisation":"NOAA Aviation Weather Center","distributionPath":"JSON data API","classification":"public-distribution-path","status":"available","pathStatus":"ok","timestampProvenance":"AWC receiptTime (report-specific)","timestamps":{"observation":{"value":"2026-11-10T17:20:00.000Z","provenance":"AWC obsTime"},"source":{"value":"2026-11-10T17:25:34.389Z","provenance":"AWC receiptTime (report-specific)"},"terminalWeather":{"value":"2026-11-10T17:48:45.602Z","provenance":"Terminal Weather fetch completion"}}},{"id":"met_norway","name":"MET Norway Tafmetar","organisation":"Norwegian Meteorological Institute","distributionPath":"TAC text feed","classification":"public-distribution-path","status":"available","pathStatus":"ok","timestampProvenance":"HTTP Last-Modified (response-wide)","timestamps":{"observation":{"value":"2026-11-10T17:20:00.000Z","provenance":"Derived from TAC day-time group"},"source":{"value":"2026-11-10T17:48:45.000Z","provenance":"HTTP Last-Modified (response-wide)"},"terminalWeather":{"value":"2026-11-10T17:48:45.891Z","provenance":"Terminal Weather fetch completion"}}},{"id":"nws_tgftp","name":"NWS TGFTP station files","organisation":"NOAA National Weather Service","distributionPath":"Per-station TAC files","classification":"public-distribution-path","status":"available","pathStatus":"ok","timestampProvenance":"HTTP Last-Modified (station file)","timestamps":{"observation":{"value":"2026-11-10T17:20:00.000Z","provenance":"Derived from TAC day-time group"},"source":{"value":"2026-11-10T17:25:30.000Z","provenance":"HTTP Last-Modified (station file)"},"terminalWeather":{"value":"2026-11-10T17:48:45.575Z","provenance":"Terminal Weather fetch completion"}}}],"events":[{"type":"terminal-weather.integrity.snapshot","basis":"current-snapshot","detectedAt":"2026-11-10T17:48:45.891Z","station":"LIMC","data":{"state":"aligned","latestObservedAt":"2026-11-10T17:20:00.000Z","availablePathCount":3,"expectedPathCount":3},"derivedFrom":["awc","met_norway","nws_tgftp"]}]}}