# Quality report

Public-release candidate version 0.1

Dataset version: 0.1  
Snapshot cutoff: 2026-09-26T02:30:02Z

## Summary

- Total records: 11,955
- Valid: 10,444
- Missing: 1,376
- API error: 89
- Stale: 26
- Delayed: 20
- Records with missing measurements: 1,486 (12.43%)
- Collection gaps over 7.5 minutes: 35
- Repeated-observation rows: 61
- Negative observation-age rows: 14
- API-QC suspect rows: 175
- Suspect-pressure rows: 1,991

## Principal limitations

September 18 contains no valid measurements despite a full set of logger attempts. Extended missing-observation periods also occur September 6–7 and September 14–19. API errors include 87 recorded DNS-resolution failures for `api.weather.com`, one access-denied error, and one timeout in the captured source.

The largest observed collection gaps are:

- 2026-09-15T09:14:01Z to 2026-09-15T12:52:03Z: 218.03 minutes
- 2026-09-09T20:24:01Z to 2026-09-09T23:22:01Z: 178.00 minutes
- 2026-09-08T17:18:35Z to 2026-09-08T17:47:22Z: 28.78 minutes
- 2026-09-21T15:34:00Z to 2026-09-21T15:50:16Z: 16.27 minutes
- 2026-09-08T17:05:58Z to 2026-09-08T17:18:35Z: 12.62 minutes
- 2026-09-09T02:39:02Z to 2026-09-09T02:51:04Z: 12.03 minutes
- 2026-09-21T15:58:49Z to 2026-09-21T16:10:44Z: 11.92 minutes
- 2026-09-08T18:19:55Z to 2026-09-08T18:31:05Z: 11.17 minutes
- 2026-09-05T22:44:01Z to 2026-09-05T22:54:42Z: 10.68 minutes
- 2026-09-09T08:09:09Z to 2026-09-09T08:19:21Z: 10.20 minutes

## Pressure anomaly

The known anomalous pressure interval runs from 2026-08-19T13:34:00Z through 2026-08-26T11:28:59Z. Values are retained without correction and marked `suspect_pressure`. The rule also flags pressure outside 850–1085 hPa.

## Interpretation

Original quality flags remain unchanged. Derivative flags identify API-QC concerns, negative clock skew, repeated observations, collection gaps, suspect pressure, missing measurements, and stale or delayed observations. Suspect and missing data are retained and flagged; no interpolation or silent correction has been performed.


## Public-release policy

Raw JSONL and raw ZIP archives are excluded from this candidate because they contain location metadata. Public charts and summaries must exclude, distinguish, or visibly annotate `suspect_pressure` records. The approved publication-quality flags are preserved. No interpolation, deletion of suspect records, or replacement of suspect pressure values has been performed.