Boston's forecast for Wednesday has moved 7°F warmer
52°F in the 20261110T12:00Z run, 58°F in the 20261112T06:00Z — the 3rd-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 6°F.
RevisionsThursday, November 12, 2026Boston, Massachusetts
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Milepost 1673
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, November 18 at 18Z in Boston, that trail runs from 51.5°F in the 20261110T12:00Z cycle to 58.4°F in the 20261112T06:00Z — a move of +6.8°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 Wednesday at 18Z api.weather.city /v1/history (nbm-qmd) |
6.8 °F | normal 0.0 °F · 3 of 5 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
5.9 °F | normal 6.8 °F current run |
- Milepost
- 1673 · laid 2026-11-12T16:25:30Z
- Model
- nbm-qmd · cycle 20261112T06:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Stores
- https://api.weather.city/v1/history
- Tagged
- I-500 Daily Weather · Boston, Massachusetts (42.36, -71.058) · by rule, at build
- Digest
- 86ad09967aa674a46646dd3958265385f75bd3c0e748051fed0962ca84a5f4a9