Boston, Massachusetts Revisions
MILEPOST 1357
Boston's forecast for Wednesday has moved 16°F warmer
55°F in the 20261009T12:00Z run, 71°F in the 20261011T06:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 16°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 54.6°F in the 20261009T12:00Z cycle to 71.0°F in the 20261011T06:00Z — a move of +16.4°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 15Z api.weather.city /v1/history (nbm-qmd) |
16.4 °F | normal 0.0 °F · 1 of 10 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
16.4 °F | normal 16.4 °F current run |
- Milepost
- 1357 · laid 2026-10-11T16:25:15Z
- Model
- nbm-qmd · cycle 20261011T06:00Z
- 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
- 67de291a8335ba3d44e7fefc6dcd09bc10120a64de6d13de1d9bcaf1840f50aa
- Machine
- JSON