Boston, Massachusetts Revisions
MILEPOST 1573
Boston's forecast for Tuesday has moved 7°F colder
46°F in the 20261101T18:00Z run, 39°F in the 20261103T12:00Z — 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 12°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Tuesday, November 10 at 12Z in Boston, that trail runs from 46.0°F in the 20261101T18:00Z cycle to 38.6°F in the 20261103T12:00Z — a move of -7.4°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 Tuesday at 12Z api.weather.city /v1/history (nbm-qmd) |
-7.4 °F | normal 0.0 °F · 2 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
12.4 °F | normal 7.4 °F current run |
- Milepost
- 1573 · laid 2026-11-03T22:25:23Z
- Model
- nbm-qmd · cycle 20261103T12:00Z
- 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
- 3620178676784b2c070a536d7d8de71e04b7b5c6673ca0c9b54b2f59af7a1fdd
- Machine
- JSON