Boston, Massachusetts Revisions
MILEPOST 1471
Boston's forecast for Wednesday has moved 7°F colder
44°F in the 20261020T18:00Z run, 37°F in the 20261022T12:00Z — the 2nd-largest revision of the 3 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 11°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, October 28 at 06Z in Boston, that trail runs from 44.3°F in the 20261020T18:00Z cycle to 37.5°F in the 20261022T12:00Z — 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 Wednesday at 06Z api.weather.city /v1/history (nbm-qmd) |
-6.8 °F | normal 0.0 °F · 2 of 3 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
10.6 °F | normal 6.8 °F current run |
- Milepost
- 1471 · laid 2026-10-22T21:25:24Z
- Model
- nbm-qmd · cycle 20261022T12:00Z
- 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
- d5410ba8afdff76318e7871e8379cd15dd1900d2c4bd83e2f7f5b1c43245057b
- Machine
- JSON