Boston, Massachusetts Revisions
MILEPOST 1208
Boston's forecast for Saturday has moved 9°F warmer
59°F in the 20260922T12:00Z run, 69°F in the 20260925T00:00Z — the 3rd-largest revision of the 7 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 Saturday, October 3 at 00Z in Boston, that trail runs from 59.3°F in the 20260922T12:00Z cycle to 68.6°F in the 20260925T00:00Z — a move of +9.4°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 Saturday at 00Z api.weather.city /v1/history (nbm-qmd) |
9.4 °F | normal 0.0 °F · 3 of 7 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
12.6 °F | normal 9.4 °F current run |
- Milepost
- 1208 · laid 2026-09-25T10:25:14Z
- Model
- nbm-qmd · cycle 20260925T00:00Z
- 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
- e23c829034e7ab4bc9c5e1ab5c6c2857bafda7e68f6f77b21bb5a89d6eb4ae46
- Machine
- JSON