Boston, Massachusetts Revisions
MILEPOST 1511
Boston's forecast for Sunday has moved 10°F colder
48°F in the 20261025T18:00Z run, 39°F in the 20261027T12:00Z — the 2nd-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 12°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Sunday, November 1 at 06Z in Boston, that trail runs from 48.3°F in the 20261025T18:00Z cycle to 38.6°F in the 20261027T12:00Z — a move of -9.7°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 Sunday at 06Z api.weather.city /v1/history (nbm-qmd) |
-9.7 °F | normal 0.0 °F · 2 of 7 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
12.4 °F | normal 9.7 °F current run |
- Milepost
- 1511 · laid 2026-10-27T22:25:26Z
- Model
- nbm-qmd · cycle 20261027T12:00Z
- 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
- a712115643fadf143faed795ac1c31588b05aebbd1da0fffa792810a4ee21374
- Machine
- JSON