Boston, Massachusetts Revisions
MILEPOST 1571
Boston's forecast for Thursday has moved 6°F colder
40°F in the 20261101T12:00Z run, 34°F in the 20261103T06:00Z — the 3rd-largest revision of the 4 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 14°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Thursday, November 12 at 12Z in Boston, that trail runs from 40.0°F in the 20261101T12:00Z cycle to 33.5°F in the 20261103T06:00Z — a move of -6.5°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 Thursday at 12Z api.weather.city /v1/history (nbm-qmd) |
-6.5 °F | normal 0.0 °F · 3 of 4 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14 °F | normal 6.5 °F current run |
- Milepost
- 1571 · laid 2026-11-03T16:25:25Z
- Model
- nbm-qmd · cycle 20261103T06:00Z
- 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
- ff9b96e28e7efaace4a2e0e6928a915d0ca143d0d0a557e6b3b78b43b17d3fdd
- Machine
- JSON