Boston, Massachusetts Revisions
MILEPOST 1353
Boston's forecast for Wednesday has moved 12°F warmer
55°F in the 20261009T00:00Z run, 67°F in the 20261010T18:00Z — the 3rd-largest revision of the 10 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 17°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 55.1°F in the 20261009T00:00Z cycle to 66.8°F in the 20261010T18:00Z — a move of +11.7°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) |
11.7 °F | normal 0.0 °F · 3 of 10 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
16.6 °F | normal 11.7 °F current run |
- Milepost
- 1353 · laid 2026-10-11T04:25:15Z
- Model
- nbm-qmd · cycle 20261010T18:00Z
- 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
- 2268ebcf1b7880158db9b54c40e1af5e933b43d302b77485c549719c4a8506f3
- Machine
- JSON