New York, New York Revisions
MILEPOST 1164
New York's forecast for Saturday has moved 7°F colder
70°F in the 20260919T00:00Z run, 63°F in the 20260920T18:00Z — the 2nd-largest revision of the 2 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 17°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Saturday, September 26 at 18Z in New York, that trail runs from 69.7°F in the 20260919T00:00Z cycle to 62.8°F in the 20260920T18:00Z — a move of -6.9°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 Saturday at 18Z api.weather.city /v1/history (nbm-qmd) |
-6.9 °F | normal 0.0 °F · 2 of 2 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
16.9 °F | normal 6.9 °F current run |
- Milepost
- 1164 · laid 2026-09-21T05:26:31Z
- Model
- nbm-qmd · cycle 20260920T18:00Z
- 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
- d9a1a6ef0290937e5e70cc8246444479d8e545b10b3cd7aa29b072f4f5421f8a
- Machine
- JSON