New York, New York Revisions
MILEPOST 1136
New York's forecast for Friday has moved 9°F colder
72°F in the 20260917T00:00Z run, 63°F in the 20260918T18:00Z — the largest revision of any city on the roster. 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 Friday, September 25 at 18Z in New York, that trail runs from 72.3°F in the 20260917T00:00Z cycle to 62.9°F in the 20260918T18:00Z — a move of -9.5°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 Friday at 18Z api.weather.city /v1/history (nbm-qmd) |
-9.5 °F | normal 0.0 °F · 1 of 8 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
18 °F | normal 9.5 °F current run |
- Milepost
- 1136 · laid 2026-09-19T04:25:25Z
- Model
- nbm-qmd · cycle 20260918T18:00Z
- 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
- af8755367919512bded9e5c841d1f4689b34e8e500e0c9157844fac9ccc0faac
- Machine
- JSON