Boston, Massachusetts Revisions
MILEPOST 1299
Boston's forecast for Monday has moved 7°F warmer
50°F in the 20261003T18:00Z run, 58°F in the 20261005T12:00Z — 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 15°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Monday, October 12 at 06Z in Boston, that trail runs from 50.5°F in the 20261003T18:00Z cycle to 57.8°F in the 20261005T12:00Z — a move of +7.4°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 Monday at 06Z api.weather.city /v1/history (nbm-qmd) |
7.4 °F | normal 0.0 °F · 3 of 4 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
15.5 °F | normal 7.4 °F current run |
- Milepost
- 1299 · laid 2026-10-05T22:25:12Z
- Model
- nbm-qmd · cycle 20261005T12:00Z
- 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
- 1f3063e696b0b87ece5c61d53c0b5f6872751004d5210576256ebb8cd67a2c62
- Machine
- JSON