Boston, Massachusetts Revisions
MILEPOST 1381
Boston's forecast for Saturday has moved 12°F warmer
52°F in the 20261012T12:00Z run, 64°F in the 20261014T06:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 10°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Saturday, October 17 at 03Z in Boston, that trail runs from 52.4°F in the 20261012T12:00Z cycle to 64.3°F in the 20261014T06:00Z — a move of +11.9°F across 8 runs.
The change is larger than the run's own 10th-to-90th percentile spread — the guidance did not merely narrow, it moved off its previous position.
Model NBM-QMD, via api.weather.city /v1/history. Percentiles are the same run's own.
The numbers in this piece, with what they are measured against
| forecast revision for Saturday at 03Z api.weather.city /v1/history (nbm-qmd) |
11.9 °F | normal 0.0 °F · 1 of 9 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
9.7 °F | normal 11.9 °F current run |
- Milepost
- 1381 · laid 2026-10-14T16:25:20Z
- Model
- nbm-qmd · cycle 20261014T06:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Source
- https://api.weather.city/v1/history
- Digest
- 4f4c0333f7eb27db6346bf91f4c3551a6e1a379af45562d4327618583294eec5
- Machine
- JSON