Boston, Massachusetts Revisions
MILEPOST 1355
Boston's forecast for Wednesday has moved 15°F warmer
54°F in the 20261009T06:00Z run, 70°F in the 20261011T00:00Z — the 2nd-largest revision of the 9 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 18°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, October 14 at 15Z in Boston, that trail runs from 54.0°F in the 20261009T06:00Z cycle to 69.5°F in the 20261011T00:00Z — a move of +15.5°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 Wednesday at 15Z api.weather.city /v1/history (nbm-qmd) |
15.5 °F | normal 0.0 °F · 2 of 9 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
17.6 °F | normal 15.5 °F current run |
- Milepost
- 1355 · laid 2026-10-11T10:25:15Z
- Model
- nbm-qmd · cycle 20261011T00:00Z
- 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
- 8346112e1d8fad2f9d517b7df6be1878100f0e6dd88160f9a5a67ab40804e243
- Machine
- JSON