Denver's forecast for Sunday has moved 13°F colder
69°F in the 20260923T12:00Z run, 56°F in the 20260925T06:00Z — the 3rd-largest revision of the 6 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 28°F.
RevisionsFriday, September 25, 2026Denver, Colorado
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Milepost 1211
Successive cycles do not merely refresh a forecast; they leave a trail. For Sunday, October 4 at 18Z in Denver, that trail runs from 68.7°F in the 20260923T12:00Z cycle to 55.9°F in the 20260925T06:00Z — a move of -12.9°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 Sunday at 18Z api.weather.city /v1/history (nbm-qmd) |
-12.9 °F | normal 0.0 °F · 3 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
27.6 °F | normal 12.9 °F current run |
- Milepost
- 1211 · laid 2026-09-25T16:25:16Z
- Model
- nbm-qmd · cycle 20260925T06:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Stores
- https://api.weather.city/v1/history
- Tagged
- I-500 Daily Weather · Denver, Colorado (39.739, -104.99) · by rule, at build
- Digest
- 6d03ee3ca872cd34d85dc6a2950fcc482023210bded237f20e9e83a36b5a53fe