Boston, Massachusetts Revisions
MILEPOST 1525
Boston's forecast for Wednesday has moved 14°F warmer
53°F in the 20261027T06:00Z run, 67°F in the 20261029T00:00Z — the largest revision of any city on the roster. 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 Wednesday, November 4 at 18Z in Boston, that trail runs from 52.8°F in the 20261027T06:00Z cycle to 67.2°F in the 20261029T00:00Z — a move of +14.4°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 18Z api.weather.city /v1/history (nbm-qmd) |
14.4 °F | normal 0.0 °F · 1 of 9 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14.9 °F | normal 14.4 °F current run |
- Milepost
- 1525 · laid 2026-10-29T10:25:24Z
- Model
- nbm-qmd · cycle 20261029T00:00Z
- 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
- d0d037daf641bb5f722203fe7937a5b64ebc67d0a595b285bdc35e9cdf7d5f10
- Machine
- JSON