Boston, Massachusetts Revisions
MILEPOST 1482
Boston's forecast for Friday has moved 7°F warmer
44°F in the 20261021T12:00Z run, 52°F in the 20261023T06:00Z — 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 13°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Friday, October 30 at 06Z in Boston, that trail runs from 44.1°F in the 20261021T12:00Z cycle to 51.5°F in the 20261023T06:00Z — 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 Friday at 06Z api.weather.city /v1/history (nbm-qmd) |
7.4 °F | normal 0.0 °F · 2 of 7 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
12.6 °F | normal 7.4 °F current run |
- Milepost
- 1482 · laid 2026-10-23T16:25:20Z
- Model
- nbm-qmd · cycle 20261023T06:00Z
- 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
- 02e79dfb062f71d984b261d1c7fe7d6100a2e862d88ce053c9d7223275c2c022
- Machine
- JSON