Boston, Massachusetts Revisions
MILEPOST 1550
Boston's forecast for Monday has moved 8°F warmer
38°F in the 20261029T18:00Z run, 46°F in the 20261031T12:00Z — the 2nd-largest revision of the 6 cities on the roster that moved at all. 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 Monday, November 9 at 12Z in Boston, that trail runs from 38.0°F in the 20261029T18:00Z cycle to 45.6°F in the 20261031T12:00Z — a move of +7.6°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 Monday at 12Z api.weather.city /v1/history (nbm-qmd) |
7.6 °F | normal 0.0 °F · 2 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
15.5 °F | normal 7.6 °F current run |
- Milepost
- 1550 · laid 2026-10-31T22:25:23Z
- Model
- nbm-qmd · cycle 20261031T12:00Z
- 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
- 61adfd1fa7334f3b2cf88f94d6dfef8879da1b165beccc145e149e88bf94e724
- Machine
- JSON