Boston, Massachusetts Revisions
MILEPOST 1480
Boston's forecast for Friday has moved 6°F warmer
43°F in the 20261021T06:00Z run, 50°F in the 20261023T00:00Z — the 3rd-largest revision of the 3 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 13°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Friday, October 30 at 12Z in Boston, that trail runs from 43.4°F in the 20261021T06:00Z cycle to 49.7°F in the 20261023T00:00Z — a move of +6.3°F across 8 runs.
The change sits well inside the run's own spread, which is the guidance converging rather than reversing.
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 Friday at 12Z api.weather.city /v1/history (nbm-qmd) |
6.3 °F | normal 0.0 °F · 3 of 3 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
13.3 °F | normal 6.3 °F current run |
- Milepost
- 1480 · laid 2026-10-23T10:25:18Z
- Model
- nbm-qmd · cycle 20261023T00:00Z
- 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
- e24f0107ab6babfd29d7a96426630eb692a93a731999ad2d986a814f6a70b690
- Machine
- JSON