Boston, Massachusetts Revisions
MILEPOST 1345
Boston's forecast for Tuesday has moved 8°F colder
66°F in the 20261008T06:00Z run, 58°F in the 20261010T00:00Z — the 2nd-largest revision of the 9 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 19°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Tuesday, October 13 at 18Z in Boston, that trail runs from 66.1°F in the 20261008T06:00Z cycle to 57.8°F in the 20261010T00:00Z — a move of -8.3°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 Tuesday at 18Z api.weather.city /v1/history (nbm-qmd) |
-8.3 °F | normal 0.0 °F · 2 of 9 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
19.1 °F | normal 8.3 °F current run |
- Milepost
- 1345 · laid 2026-10-10T10:25:12Z
- Model
- nbm-qmd · cycle 20261010T00:00Z
- 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
- 24c1666b1a5bacfe8c4c08f016945a602573d34dd1910948677ada393d52ccb4
- Machine
- JSON