Boston, Massachusetts Revisions
MILEPOST 1535
Boston's forecast for Thursday has moved 7°F warmer
48°F in the 20261028T06:00Z run, 55°F in the 20261030T00:00Z — the 2nd-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 13°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Thursday, November 5 at 09Z in Boston, that trail runs from 47.8°F in the 20261028T06:00Z cycle to 54.6°F in the 20261030T00:00Z — a move of +6.8°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 Thursday at 09Z api.weather.city /v1/history (nbm-qmd) |
6.8 °F | normal 0.0 °F · 2 of 4 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
13 °F | normal 6.8 °F current run |
- Milepost
- 1535 · laid 2026-10-30T10:25:24Z
- Model
- nbm-qmd · cycle 20261030T00:00Z
- 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
- 97c28187589292be511c53035171bc4f0d133c96907f7140a52a82870959972c
- Machine
- JSON