Boston, Massachusetts Revisions
MILEPOST 1302
Boston's forecast for Sunday has moved 8°F warmer
58°F in the 20261004T00:00Z run, 66°F in the 20261005T18:00Z — the 2nd-largest revision of the 5 cities on the roster that moved at all. 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 58.0°F in the 20261004T00:00Z cycle to 66.3°F in the 20261005T18:00Z — a move of +8.3°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) |
8.3 °F | normal 0.0 °F · 2 of 5 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14.8 °F | normal 8.3 °F current run |
- Milepost
- 1302 · laid 2026-10-06T04:25:12Z
- Model
- nbm-qmd · cycle 20261005T18:00Z
- 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
- 1927139c45148b8076ad9f7de9b6b76c0190b2ddd743b1638061e2b24853db12
- Machine
- JSON