New York, New York Revisions
MILEPOST 1120
New York's forecast for Tuesday has moved 12°F colder
73°F in the 20260915T12:00Z run, 60°F in the 20260917T06:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 9°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Tuesday, September 22 at 18Z in New York, that trail runs from 72.6°F in the 20260915T12:00Z cycle to 60.2°F in the 20260917T06:00Z — a move of -12.4°F across 8 runs.
The change is larger than the run's own 10th-to-90th percentile spread — the guidance did not merely narrow, it moved off its previous position.
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 Tuesday at 18Z api.weather.city /v1/history (nbm-qmd) |
-12.4 °F | normal 0.0 °F · 1 of 7 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
8.9 °F | normal 12.4 °F current run |
- Milepost
- 1120 · laid 2026-09-17T17:25:13Z
- Model
- nbm-qmd · cycle 20260917T06:00Z
- 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
- cacee7333800a094646cd9d7d0110b214a3963fcda30754e430a58aa7982c4a7
- Machine
- JSON