Boston, Massachusetts Revisions
MILEPOST 1348
Boston's forecast for Wednesday has moved 13°F warmer
55°F in the 20261008T18:00Z run, 68°F in the 20261010T12:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 14°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, October 14 at 15Z in Boston, that trail runs from 55.3°F in the 20261008T18:00Z cycle to 67.9°F in the 20261010T12:00Z — a move of +12.6°F across 8 runs.
The change is about half the run's 10th-to-90th percentile spread, so the earlier forecast is still inside the current range of outcomes.
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 Wednesday at 15Z api.weather.city /v1/history (nbm-qmd) |
12.6 °F | normal 0.0 °F · 1 of 8 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14.4 °F | normal 12.6 °F current run |
- Milepost
- 1348 · laid 2026-10-10T22:25:13Z
- Model
- nbm-qmd · cycle 20261010T12:00Z
- 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
- a37751e4629c79d58c3de9e2b436024a63f1f1689cfec6b42628ffd81e65f01e
- Machine
- JSON