NETWORK / OVERVIEW

European aerodrome network

12 stations3 distribution pathsCurrent snapshot

Monitored stations12Current preview scope

Source paths online3 / 33 paths returning data

Reports aligned11Latest observation key

Needs attention1Difference, lag or incomplete

NETWORK STATE

Latest station events

Snapshot 17s ago

Station	Observation	Paths	Integrity	State
EFHKHelsinki Airport	12/16:50Z	AMN	3/3 fingerprinted	Source lag
EPWAWarsaw Chopin Airport	12/16:30Z	AMN	3/3 fingerprinted	Aligned
LFPBParis–Le Bourget Airport	12/16:30Z	AMN	3/3 fingerprinted	Aligned
EHAMAmsterdam Airport Schiphol	12/16:25Z	AMN	3/3 fingerprinted	Aligned
EGLCLondon City Airport	12/16:20Z	AMN	3/3 fingerprinted	Aligned
LEMDAdolfo Suárez Madrid–Barajas Airport	12/16:30Z	AMN	3/3 fingerprinted	Aligned
LTACAnkara Esenboğa Airport	12/16:20Z	AMN	3/3 fingerprinted	Aligned
LIMCMilan Malpensa Airport	12/16:20Z	AMN	3/3 fingerprinted	Aligned
ESSAStockholm Arlanda Airport	12/16:20Z	AMN	3/3 fingerprinted	Aligned
EDDFFrankfurt Airport	12/16:20Z	AMN	3/3 fingerprinted	Aligned
LOWWVienna International Airport	12/16:20Z	AMN	3/3 fingerprinted	Aligned
EIDWDublin Airport	12/16:30Z	AMN	3/3 fingerprinted	Aligned

ESSA

Sweden

Stockholm Arlanda Airport

AlignedAll available paths show the same observation time and canonical TAC content.

Permanent station page

NORMALIZED EVENT

METAR.OBSERVED

preview_33adeabb5c7a

Station: ESSA
Observed at: 12 Sep 16:20:00Z
Snapshot collected: 12 Sep 16:53:11Z
Revision: Current snapshot
Available paths: 3 / 3
Integrity: Aligned

Exact TAC / selected representationMETAR ESSA 121620Z 18008KT CAVOK 15/11 Q1013 NOSIG

SHA-25633adeabb5c7aa6f469abb06fbcda3a3ab50116e25e8b9d9fcb39aacdb7a5f13d

SOURCE TRACE

Captured evidence

UTC

Aviation Weather Center Data APIAWC receiptTime (report-specific)
12 Sep 16:24:17Z
MET Norway TafmetarHTTP Last-Modified (response-wide)
12 Sep 16:53:10Z
NWS TGFTP station filesHTTP Last-Modified (station file)
12 Sep 16:24:21Z

SOURCE INTEGRITY

Evidence behind the event

All available paths show the same observation time and canonical TAC content.

Path	Observation	Source timestamp	Fingerprint	Result
Aviation Weather Center Data API	12/16:20Z	12 Sep 16:24:17Z	`33adeabb5c7aa6f469abb06fbcda3a3ab50116e25e8b9d9fcb39aacdb7a5f13d`	Captured
MET Norway Tafmetar	12/16:20Z	12 Sep 16:53:10Z	`3d24fe3412876f18c6d568b060bed270286739f5c8a6880af54db6f8abc9d2ea`	Captured
NWS TGFTP station files	12/16:20Z	12 Sep 16:24:21Z	`9b8bb68baa1150364b2fe9b1b4b7e45e97ace693fab466ea2ad10a561f938db1`	Captured

EVENTS / CURRENT SNAPSHOT

Evidence and conditions

Preview logic

EVENT MODEL / CURRENT SNAPSHOT

Every current condition stays explicit

ESSA

12 Sep 16:53:11Z
Snapshot integrity classified
Current state: Aligned.

AUTOMATION / PLANNED

Turn a condition into a signal

Controls are illustrative

ALERT RULES

Workspace routing

Not armed

01

Expected report missingSignal when no new observation is visible after its expected window.

120 sec

02

Source content divergesSignal when meaningful TAC tokens differ for one observation key.

Any path

03

Correction presentEmit an event when COR is present in captured current-snapshot evidence.

Immediate

RETENTION + INTEGRITY

Evidence survives normalization

Planned

01
Original representationExact current TAC remains attached to its source provenance.
Inspect
02
Revision chainNIL, AUTO, SPECI and COR remain explicit in the planned history model.
Planned
03
Content identitySHA-256 fingerprints expose selected-string identity.
Verifiable
04
Retention policyLicence-aware workspace controls.
To be set