Boston, Massachusetts Revisions
MILEPOST 1303
Boston's forecast for Sunday has moved 11°F warmer
59°F in the 20261004T06:00Z run, 69°F in the 20261006T00:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 15°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Sunday, October 11 at 18Z in Boston, that trail runs from 58.5°F in the 20261004T06:00Z cycle to 69.2°F in the 20261006T00:00Z — a move of +10.6°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 Sunday at 18Z api.weather.city /v1/history (nbm-qmd) |
10.6 °F | normal 0.0 °F · 1 of 8 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14.6 °F | normal 10.6 °F current run |
- Milepost
- 1303 · laid 2026-10-06T10:25:13Z
- Model
- nbm-qmd · cycle 20261006T00:00Z
- 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
- f45ac8e5f13445eb3d72c4211da157ff72eff07cf8987955edbca4aa45643b6a
- Machine
- JSON