New York, New York Revisions
MILEPOST 1143
New York's forecast for Friday has moved 6°F colder
69°F in the 20260917T12:00Z run, 63°F in the 20260919T06:00Z — the 3rd-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 19°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 69.0°F in the 20260917T12:00Z cycle to 62.6°F in the 20260919T06:00Z — a move of -6.3°F across 8 runs.
The change sits well inside the run's own spread, which is the guidance converging rather than reversing.
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) |
-6.3 °F | normal 0.0 °F · 3 of 3 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
19.1 °F | normal 6.3 °F current run |
- Milepost
- 1143 · laid 2026-09-19T16:25:23Z
- Model
- nbm-qmd · cycle 20260919T06:00Z
- 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
- 061294aed87dd9a2d3417162589a9eff1f94f4bf1b248cecd6a1851fc56e004a
- Machine
- JSON