Boston, Massachusetts Revisions
MILEPOST 1386
Boston's forecast for Saturday has moved 13°F warmer
52°F in the 20261013T00:00Z run, 65°F in the 20261014T18:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 8°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Saturday, October 17 at 03Z in Boston, that trail runs from 51.7°F in the 20261013T00:00Z cycle to 64.7°F in the 20261014T18:00Z — a move of +13.0°F across 8 runs.
The change is larger than the run's own 10th-to-90th percentile spread — the guidance did not merely narrow, it moved off its previous position.
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 Saturday at 03Z api.weather.city /v1/history (nbm-qmd) |
13 °F | normal 0.0 °F · 1 of 9 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
8.1 °F | normal 13.0 °F current run |
- Milepost
- 1386 · laid 2026-10-15T04:25:16Z
- Model
- nbm-qmd · cycle 20261014T18:00Z
- 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
- c2d705732fdceacf83a2d1e3974c57d62a53b8d8663157a9d95608a6b2ab14f6
- Machine
- JSON